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• debugging on bsd using gdb or similar tootls

  - by agent.smith

  I have started using freebsd lately and realized gdb does not support remote debugging on it. Whenever, I try to do remote debugging using gdbserver, I run into SIGSEGV crashes and error message says can’t find definition of “r_debug_state”. Has anyone ever experienced this and solved it? Statically compiled single threaded programs can be compiled using gdbserver. However, other than that it is mostly looking difficult to use. Let me know if anyone knows any other tools to do remote application debugging on bsd or how to fix the issue. (I am on x64 freebsd 9) Thanks

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• iTunes 9.0.2 hangs on launch on Mac OS X 10.6.2

  - by dlamblin

  My iTunes 9.0.2 hangs on launch in OS X 10.6.2. This doesn't happen all the time, only if I've been running for a while. Then it will recur until I restart. Similarly Safari 4.0.4 will hang in the flash player plugin when about to play a video. If I restart both these problems go away until later. Based on this crash dump I am suspecting Audio Hijack Pro. I will try to install a newer version of the driver involved, but so far I haven't had much luck. I have uninstalled the Flash Plugin (10.0.r42 and r32) but clearly I want it in the long run. This is iTunes' crash report. Date/Time: 2009-12-14 19:56:02 -0500 OS Version: 10.6.2 (Build 10C540) Architecture: x86_64 Report Version: 6 Command: iTunes Path: /Applications/iTunes.app/Contents/MacOS/iTunes Version: 9.0.2 (9.0.2) Build Version: 2 Project Name: iTunes Source Version: 9022501 Parent: launchd [120] PID: 16878 Event: hang Duration: 3.55s (sampling started after 2 seconds) Steps: 16 (100ms sampling interval) Pageins: 5 Pageouts: 0 Process: iTunes [16878] Path: /Applications/iTunes.app/Contents/MacOS/iTunes UID: 501 Thread 8f96000 User stack: 16 ??? (in iTunes + 6633) [0x29e9] 16 ??? (in iTunes + 6843) [0x2abb] 16 ??? (in iTunes + 11734) [0x3dd6] 16 ??? (in iTunes + 44960) [0xbfa0] 16 ??? (in iTunes + 45327) [0xc10f] 16 ??? (in iTunes + 2295196) [0x23159c] 16 ??? (in iTunes + 103620) [0x1a4c4] 16 ??? (in iTunes + 105607) [0x1ac87] 16 ??? (in iTunes + 106442) [0x1afca] 16 OpenAComponent + 433 (in CarbonCore) [0x972e9dd0] 16 CallComponentOpen + 43 (in CarbonCore) [0x972ebae7] 16 CallComponentDispatch + 29 (in CarbonCore) [0x972ebb06] 16 DefaultOutputAUEntry + 319 (in CoreAudio) [0x70031117] 16 AUGenericOutputEntry + 15273 (in CoreAudio) [0x7000e960] 16 AUGenericOutputEntry + 13096 (in CoreAudio) [0x7000e0df] 16 AUGenericOutputEntry + 9628 (in CoreAudio) [0x7000d353] 16 ??? [0xe0c16d] 16 ??? [0xe0fdf8] 16 ??? [0xe0e1e7] 16 ahs_hermes_CoreAudio_init + 32 (in Instant Hijack Server) [0x13fc7e9] 16 semaphore_wait_signal_trap + 10 (in libSystem.B.dylib) [0x9798e922] Kernel stack: 16 semaphore_wait_continue + 0 [0x22a0a5] Thread 9b9eb7c User stack: 16 thread_start + 34 (in libSystem.B.dylib) [0x979bbe42] 16 _pthread_start + 345 (in libSystem.B.dylib) [0x979bbfbd] 16 ??? (in iTunes + 4011870) [0x3d475e] 16 CFRunLoopRun + 84 (in CoreFoundation) [0x993497a4] 16 CFRunLoopRunSpecific + 452 (in CoreFoundation) [0x99343864] 16 __CFRunLoopRun + 2079 (in CoreFoundation) [0x9934477f] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x9798e8da] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 9bc8b7c User stack: 16 start_wqthread + 30 (in libSystem.B.dylib) [0x979b4336] 16 _pthread_wqthread + 390 (in libSystem.B.dylib) [0x979b44f1] 16 _dispatch_worker_thread2 + 234 (in libSystem.B.dylib) [0x979b4a68] 16 _dispatch_queue_invoke + 163 (in libSystem.B.dylib) [0x979b4cc3] 16 kevent + 10 (in libSystem.B.dylib) [0x979b50ea] Kernel stack: 16 kevent + 97 [0x471745] Binary Images: 0x1000 - 0xbecfea com.apple.iTunes 9.0.2 (9.0.2) <1F665956-0131-39AF-F334-E29E510D42DA> /Applications/iTunes.app/Contents/MacOS/iTunes 0x13f6000 - 0x1402ff7 com.rogueamoeba.audio_hijack_server.hermes 2.2.2 (2.2.2) <9B29AE7F-6951-E63F-616A-482B62179A5C> /usr/local/hermes/modules/Instant Hijack Server.hermesmodule/Contents/MacOS/Instant Hijack Server 0x70000000 - 0x700cbffb com.apple.audio.units.Components 1.6.1 (1.6.1) <600769A2-479A-CA6E-A214-C8766F7CBD0F> /System/Library/Components/CoreAudio.component/Contents/MacOS/CoreAudio 0x97284000 - 0x975a3fe7 com.apple.CoreServices.CarbonCore 861.2 (861.2) <A9077470-3786-09F2-E0C7-F082B7F97838> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore 0x9798e000 - 0x97b32feb libSystem.B.dylib ??? (???) <D45B91B2-2B4C-AAC0-8096-1FC48B7E9672> /usr/lib/libSystem.B.dylib 0x99308000 - 0x9947ffef com.apple.CoreFoundation 6.6.1 (550.13) <AE9FC6F7-F0B2-DE58-759E-7DB89C021A46> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation Process: AirPort Base Station Agent [142] Path: /System/Library/CoreServices/AirPort Base Station Agent.app/Contents/MacOS/AirPort Base Station Agent UID: 501 Thread 8b1d3d4 DispatchQueue 1 User stack: 16 ??? (in AirPort Base Station Agent + 5344) [0x1000014e0] 16 ??? (in AirPort Base Station Agent + 70666) [0x10001140a] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 8b80000 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 6e3c7a8 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff878869da] Kernel stack: 16 workqueue_thread_yielded + 562 [0x4cb6ae] Thread 8b0f3d4 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 select$DARWIN_EXTSN + 10 (in libSystem.B.dylib) [0x7fff878b09e2] Kernel stack: 16 sleep + 52 [0x487f93] Thread 8bcb000 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 ??? (in AirPort Base Station Agent + 71314) [0x100011692] 16 ??? (in AirPort Base Station Agent + 13712) [0x100003590] 16 ??? (in AirPort Base Station Agent + 71484) [0x10001173c] 16 __semwait_signal + 10 (in libSystem.B.dylib) [0x7fff878a79ee] Kernel stack: 16 semaphore_wait_continue + 0 [0x22a0a5] Binary Images: 0x100000000 - 0x100016fff com.apple.AirPortBaseStationAgent 1.5.4 (154.2) <73DF13C1-AF86-EC2C-9056-8D1946E607CF> /System/Library/CoreServices/AirPort Base Station Agent.app/Contents/MacOS/AirPort Base Station Agent 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: AppleSpell [3041] Path: /System/Library/Services/AppleSpell.service/Contents/MacOS/AppleSpell UID: 501 Thread 999a000 DispatchQueue 1 User stack: 16 ??? (in AppleSpell + 5852) [0x1000016dc] 16 ??? (in AppleSpell + 6508) [0x10000196c] 16 -[NSSpellServer run] + 72 (in Foundation) [0x7fff81d3b796] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 8a9e7a8 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Binary Images: 0x100000000 - 0x1000a9fef com.apple.AppleSpell 1.6.1 (61.1) <6DE57CC1-77A0-BC06-45E7-E1EACEBE1A88> /System/Library/Services/AppleSpell.service/Contents/MacOS/AppleSpell 0x7fff81cbc000 - 0x7fff81f3dfe7 com.apple.Foundation 6.6.1 (751.14) <767349DB-C486-70E8-7970-F13DB4CDAF37> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: autofsd [52] Path: /usr/libexec/autofsd UID: 0 Thread 79933d4 DispatchQueue 1 User stack: 16 ??? (in autofsd + 5340) [0x1000014dc] 16 ??? (in autofsd + 6461) [0x10000193d] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 75997a8 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Binary Images: 0x100000000 - 0x100001ff7 autofsd ??? (???) <29276FAC-AEA8-1520-5329-C75F9D453D6C> /usr/libexec/autofsd 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: blued [51] Path: /usr/sbin/blued UID: 0 Thread 7993000 DispatchQueue 1 User stack: 16 ??? (in blued + 5016) [0x100001398] 16 ??? (in blued + 152265) [0x1000252c9] 16 -[NSRunLoop(NSRunLoop) run] + 77 (in Foundation) [0x7fff81d07903] 16 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 270 (in Foundation) [0x7fff81d07a24] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 70db000 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 84d2000 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 select$DARWIN_EXTSN + 10 (in libSystem.B.dylib) [0x7fff878b09e2] Kernel stack: 16 sleep + 52 [0x487f93] Binary Images: 0x100000000 - 0x100044fff blued ??? (???) <ECD752C9-F98E-3052-26BF-DC748281C992> /usr/sbin/blued 0x7fff81cbc000 - 0x7fff81f3dfe7 com.apple.Foundation 6.6.1 (751.14) <767349DB-C486-70E8-7970-F13DB4CDAF37> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: check_afp [84504] Path: /System/Library/Filesystems/AppleShare/check_afp.app/Contents/MacOS/check_afp UID: 0 Thread 1140f000 DispatchQueue 1 User stack: 16 ??? (in check_afp + 5596) [0x1000015dc] 16 ??? (in check_afp + 12976) [0x1000032b0] 16 ??? (in check_afp + 6664) [0x100001a08] 16 ??? (in check_afp + 6520) [0x100001978] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 13ad8b7c DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 13ad6b7c User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 ??? (in check_afp + 13071) [0x10000330f] 16 mach_msg_server_once + 285 (in libSystem.B.dylib) [0x7fff878b2417] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 13ad87a8 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 select$DARWIN_EXTSN + 10 (in libSystem.B.dylib) [0x7fff878b09e2] Kernel stack: 16 sleep + 52 [0x487f93] Binary Images: 0x100000000 - 0x100004ff7 com.apple.check_afp 2.0 (2.0) <EE865A7B-8CDC-7649-58E1-6FE2B43F7A73> /System/Library/Filesystems/AppleShare/check_afp.app/Contents/MacOS/check_afp 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: configd [14] Path: /usr/libexec/configd UID: 0 Thread 704a3d4 DispatchQueue 1 User stack: 16 start + 52 (in configd) [0x100001488] 16 main + 2051 (in configd) [0x100001c9e] 16 server_loop + 72 (in configd) [0x1000024f4] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 6e70000 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 74a7b7c User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 plugin_exec + 1440 (in configd) [0x100003c5b] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 7560000 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 _io_pm_force_active_settings + 2266 (in PowerManagement) [0x10050f968] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 75817a8 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 select$DARWIN_EXTSN + 10 (in libSystem.B.dylib) [0x7fff878b09e2] Kernel stack: 16 sleep + 52 [0x487f93] Thread 8b1db7c User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff878869da] Kernel stack: 16 workqueue_thread_yielded + 562 [0x4cb6ae] Binary Images: 0x100000000 - 0x100026ff7 configd ??? (???) <58C02CBA-5556-4CDC-2763-814C4C7175DE> /usr/libexec/configd 0x10050c000 - 0x10051dfff com.apple.SystemConfiguration.PowerManagement 160.0.0 (160.0.0) <0AC3D2ED-919E-29C7-9EEF-629FBDDA6159> /System/Library/SystemConfiguration/PowerManagement.bundle/Contents/MacOS/PowerManagement 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: coreaudiod [114] Path: /usr/sbin/coreaudiod UID: 202 Thread 83b93d4 DispatchQueue 1 User stack: 16 ??? (in coreaudiod + 3252) [0x100000cb4] 16 ??? (in coreaudiod + 26505) [0x100006789] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 847e3d4 DispatchQueue 2 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 854c000 User stack: 3 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 3 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff878869da] Kernel stack: 3 workqueue_thread_yielded + 562 [0x4cb6ae] Binary Images: 0x100000000 - 0x10001ffef coreaudiod ??? (???) <A060D20F-A6A7-A3AE-84EC-11D7D7DDEBC6> /usr/sbin/coreaudiod 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: coreservicesd [66] Path: /System/Library/CoreServices/coreservicesd UID: 0 Thread 7994000 DispatchQueue 1 User stack: 16 ??? (in coreservicesd + 3756) [0x100000eac] 16 _CoreServicesServerMain + 522 (in CarbonCore) [0x7fff8327a972] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread 76227a8 User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 read + 10 (in libSystem.B.dylib) [0x7fff87877426] Kernel stack: 16 lo64_unix_scall + 77 [0x29e3fd] 16 unix_syscall64 + 617 [0x4ee947] 16 read_nocancel + 158 [0x496add] 16 write + 312 [0x49634d] 16 get_pathbuff + 3054 [0x3023db] 16 tsleep + 105 [0x4881ce] 16 wakeup + 786 [0x487da7] 16 thread_block + 33 [0x226fb5] 16 thread_block_reason + 331 [0x226f27] 16 thread_dispatch + 1950 [0x226c88] 16 machine_switch_context + 753 [0x2a5a37] Thread 7622b7c User stack: 16 thread_start + 13 (in libSystem.B.dylib) [0x7fff878a5e41] 16 _pthread_start + 331 (in libSystem.B.dylib) [0x7fff878a5f8e] 16 fmodWatchConsumer + 347 (in CarbonCore) [0x7fff8322f23f] 16 __semwait_signal + 10 (in libSystem.B.dylib) [0x7fff878a79ee] Kernel stack: 16 semaphore_wait_continue + 0 [0x22a0a5] Thread 79913d4 User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 244 (in libSystem.B.dylib) [0x7fff87887286] 16 _dispatch_queue_invoke + 185 (in libSystem.B.dylib) [0x7fff8788775c] 16 kevent + 10 (in libSystem.B.dylib) [0x7fff87885bba] Kernel stack: 16 kevent + 97 [0x471745] Thread 84d2b7c User stack: 16 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 16 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff878869da] Kernel stack: 16 workqueue_thread_yielded + 562 [0x4cb6ae] Thread 9b643d4 User stack: 15 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 15 __workq_kernreturn + 10 (in libSystem.B.dylib) [0x7fff878869da] Kernel stack: 16 workqueue_thread_yielded + 562 [0x4cb6ae] Binary Images: 0x100000000 - 0x100000fff coreservicesd ??? (???) <D804E55B-4376-998C-AA25-2ADBFDD24414> /System/Library/CoreServices/coreservicesd 0x7fff831cb000 - 0x7fff834fdfef com.apple.CoreServices.CarbonCore 861.2 (861.2) <39F3B259-AC2A-792B-ECFE-4F3E72F2D1A5> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore 0x7fff86e3b000 - 0x7fff86faeff7 com.apple.CoreFoundation 6.6.1 (550.13) <1E952BD9-37C6-16BE-B2F0-CD92A6283D37> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: cron [31] Path: /usr/sbin/cron UID: 0 Thread 75acb7c DispatchQueue 1 User stack: 16 ??? (in cron + 2872) [0x100000b38] 16 ??? (in cron + 3991) [0x100000f97] 16 sleep + 61 (in libSystem.B.dylib) [0x7fff878f5090] 16 __semwait_signal + 10 (in libSystem.B.dylib) [0x7fff878a79ee] Kernel stack: 16 semaphore_wait_continue + 0 [0x22a0a5] Binary Images: 0x100000000 - 0x100006fff cron ??? (???) <3C5DCC7E-B6E8-1318-8E00-AB721270BFD4> /usr/sbin/cron 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: cvmsServ [104] Path: /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/cvmsServ UID: 0 Thread 761f3d4 DispatchQueue 1 User stack: 16 ??? (in cvmsServ + 4100) [0x100001004] 16 ??? (in cvmsServ + 23081) [0x100005a29] 16 mach_msg_server + 597 (in libSystem.B.dylib) [0x7fff878ea1c8] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Binary Images: 0x100000000 - 0x100008fff cvmsServ ??? (???) <6200AD80-4159-5656-8736-B72B7388C461> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/cvmsServ 0x7fff8786c000 - 0x7fff87a2aff7 libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib Process: DirectoryService [11] Path: /usr/sbin/DirectoryService UID: 0 Thread 70db7a8 DispatchQueue 1 User stack: 16 start + 52 (in DirectoryService) [0x10000da74] 16 main + 3086 (in DirectoryService) [0x10000e68a] 16 CFRunLoopRun + 70 (in CoreFoundation) [0x7fff86e859b6] 16 CFRunLoopRunSpecific + 575 (in CoreFoundation) [0x7fff86e85c2f] 16 __CFRunLoopRun + 1698 (in CoreFoundation) [0x7fff86e867a2] 16 mach_msg_trap + 10 (in libSystem.B.dylib) [0x7fff8786ce3a] Kernel stack: 16 ipc_mqueue_receive_continue + 0 [0x210aa3] Thread <multiple> DispatchQueue 6 User stack: 17 start_wqthread + 13 (in libSystem.B.dylib) [0x7fff87886a55] 17 _pthread_wqthread + 353 (in libSystem.B.dylib) [0x7fff87886bb8] 16 _dispatch_worker_thread2 + 231 (in libSystem.B.dylib) [0x7fff87887279] 16 _dispatch_call_block_and_release + 15 (in libSystem.B.dylib) [0x7fff878a8ce8] 16 syscall + 10 (in libSystem.B.dylib) [0x7fff878a92da] 1 _disp

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• Detecting Process Shutdown/Startup Events through ActivationAgents

  - by Ramkumar Menon

  @10g - This post is motivated by one of my close friends and colleague - who wanted to proactively know when a BPEL process shuts down/re-activates. This typically happens when you have a BPEL Process that has an inbound polling adapter, when the adapter loses connectivity to the source system. Or whatever causes it. One valuable suggestion came in from one of my colleagues - he suggested I write my own ActivationAgent to do the job. Well, it really worked. Here is a sample ActivationAgent that you can use. There are few methods you need to override from BaseActivationAgent, and you are on your way to receiving notifications/what not, whenever the shutdown/startup events occur. In the example below, I am retrieving the emailAddress property [that is specified in your bpel.xml activationAgent section] and use that to send out an email notification on the activation agent initialization. You could choose to do different things. But bottomline is that you can use the below-mentioned API to access the very same properties that you specify in the bpel.xml. package com.adapter.custom.activation; import com.collaxa.cube.activation.BaseActivationAgent; import com.collaxa.cube.engine.ICubeContext; import com.oracle.bpel.client.BPELProcessId; import java.util.Date; import java.util.Properties; public class LifecycleManagerActivationAgent extends BaseActivationAgent { public BPELProcessId getBPELProcessId() { return super.getBPELProcessId(); } private void handleInit() throws Exception { //Write initialization code here System.err.println("Entered initialization code...."); //e.g. String emailAddress = getActivationAgentDescriptor().getPropertyValue(emailAddress); //send an email sendEmail(emailAddress); } private void handleLoad() throws Exception { //Write load code here System.err.println("Entered load code...."); } private void handleUnload() throws Exception { //Write unload code here System.err.println("Entered unload code...."); } private void handleUninit() throws Exception { //Write uninitialization code here System.err.println("Entered uninitialization code...."); } public void init(ICubeContext icubecontext) throws Exception { super.init(icubecontext); System.err.println("Initializing LifecycleManager Activation Agent ....."); handleInit(); } public void unload(ICubeContext icubecontext) throws Exception { super.unload(icubecontext); System.err.println("Unloading LifecycleManager Activation Agent ....."); handleUnload(); } public void uninit(ICubeContext icubecontext) throws Exception{ super.uninit(icubecontext); System.err.println("Uninitializing LifecycleManager Activation Agent ....."); handleUninit(); } public String getName() { return "Lifecyclemanageractivationagent"; } public void onStateChanged(int i, ICubeContext iCubeContext) { } public void onLifeCycleChanged(int i, ICubeContext iCubeContext) { } public void onUndeployed(ICubeContext iCubeContext) { } public void onServerShutdown() { } } Once you compile this code, generate a jar file and ensure you add it to the server startup classpath. The library is ready for use after the server restarts. To use this activationAgent, add an additional activationAgent entry in the bpel.xml for the BPEL Process that you wish to monitor. After you deploy the process, the ActivationAgent object will be called back whenever the events mentioned in the overridden methods are raised. [init(), load(), unload(), uninit()]. Subsequently, your custom code is executed. Sample bpel.xml illustrating activationAgent definition and property definition. <?xml version="1.0" encoding="UTF-8"? <BPELSuitcase timestamp="1291943469921" revision="1.0" <BPELProcess wsdlPort="{http://xmlns.oracle.com/BPELTest}BPELTestPort" src="BPELTest.bpel" wsdlService="{http://xmlns.oracle.com/BPELTest}BPELTest" id="BPELTest" <partnerLinkBindings <partnerLinkBinding name="client" <property name="wsdlLocation"BPELTest.wsdl</property </partnerLinkBinding <partnerLinkBinding name="test" <property name="wsdlLocation"test.wsdl</property </partnerLinkBinding </partnerLinkBindings <activationAgents <activationAgent className="oracle.tip.adapter.fw.agent.jca.JCAActivationAgent" partnerLink="test" <property name="portType"Read_ptt</property </activationAgent <activationAgent className="com.oracle.bpel.activation.LifecycleManagerActivationAgent" partnerLink="test" <property name="emailAddress"[email protected]</property </activationAgent </activationAgents </BPELProcess </BPELSuitcase em

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• How can I get TFS2010 to run MSDEPLOY for me through MSBUILD?

  - by Simon_Weaver

  There is an excellent PDC talk available here which describes the new MSDEPLOY features in Visual Studio 2010 - as well as how to deploy an application within TFS. You can use MSBUILD within TFS2010 to call through to MSDEPLOY to deploy your package to IIS. This is done by means of parameters to MSBUILD. The talk explains some of the command line parameters such as : /p:DeployOnBuild /p:DeployTarget=MsDeployPublish /p:CreatePackageOnPublish=True /p:MSDeployPublishMethod=InProc /p:MSDeployServiceURL=localhost /p:DeployIISAppPath="Default Web Site" But where is the documentation for this - I can't find any? I've been spending all day trying to get this to work and can't quite get it right and keep ending up with various errors. If I run the package's cmd file it deploys perfectly. But I want to get the whole deployment running through msbuild using these arguments and not a separate call to msdeploy or running the package .cmd file. How can I do this? PS. Yes I do have the Web Deployment Agent Service running. I also have the management service running under IIS. I've tried using both. Args I'm using : /p:DeployOnBuild=True /p:DeployTarget=MsDeployPublish /p:Configuration=Release /p:CreatePackageOnPublish=True /p:DeployIisAppPath=staging.example.com /p:MsDeployServiceUrl=https://staging.example.com:8172/msdeploy.axd /p:AllowUntrustedCertificate=True giving me : C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\Web\Microsoft.Web.Publishing.targets (2660): VsMsdeploy failed.(Remote agent (URL https://staging.example.com:8172/msdeploy.axd?site=staging.example.com) could not be contacted. Make sure the remote agent service is installed and started on the target computer.) Error detail: Remote agent (URL https://staging.example.com:8172/msdeploy.axd?site=staging.example.com) could not be contacted. Make sure the remote agent service is installed and started on the target computer. An unsupported response was received. The response header 'MSDeploy.Response' was '' but 'v1' was expected. The remote server returned an error: (401) Unauthorized.

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• ADO.NET (WCF) Data Services Query Interceptor Hangs IIS

  - by PreMagination

  I have an ADO.NET Data Service that's supposed to provide read-only access to a somewhat complex database. Logically I have table-per-type (TPT) inheritance in my data model but the EDM doesn't implement inheritance. (Limitation of EF and navigation properties on derived types. STILL not fixed in EF4!) I can query my EDM directly (using a separate project) using a copy of the query I'm trying to run against the web service, results are returned within 10 seconds. Disabling the query interceptors I'm able to make the same query against the web service, results are returned similarly quickly. I can enable some of the query interceptors and the results are returned slowly, up to a minute or so later. Alternatively, I can enable all the query interceptors, expand less of the properties on the main object I'm querying, and results are returned in a similar period of time. (I've increased some of the timeout periods) Up til this point Sql Profiler indicates the slow-down is the database. (That's a post for a different day) But when I enable all my query interceptors and expand all the properties I'd like to have the IIS worker process pegs the CPU for 20 minutes and a query is never even made against the database. This implies to me that yes, my implementation probably sucks but regardless the Data Services "tier" is having an issue it shouldn't. WCF tracing didn't reveal anything interesting to my untrained eye. Details: Data model: Agent-Person-Student Student has a collection of referrals Students and referrals are private, queries against the web service should only return "your" students and referrals. This means Person and Agent need to be filtered too. Other entities (Agent-Organization-School) can be accessed by anyone who has authenticated. The existing security model is poorly suited to perform this type of filtering for this type of data access, the query interceptors are complicated and cause EF to generate some entertaining sql queries. Sample Interceptor [QueryInterceptor("Agents")] public Expression<Func<Agent, Boolean>> OnQueryAgents() { //Agent is a Person(1), Educator(2), Student(3), or Other Person(13); allow if scope permissions exist return ag => (ag.AgentType.AgentTypeId == 1 || ag.AgentType.AgentTypeId == 2 || ag.AgentType.AgentTypeId == 3 || ag.AgentType.AgentTypeId == 13) && ag.Person.OrganizationPersons.Count<OrganizationPerson>(op => op.Organization.ScopePermissions.Any<ScopePermission> (p => p.ApplicationRoleAccount.Account.UserName == HttpContext.Current.User.Identity.Name && p.ApplicationRoleAccount.Application.ApplicationId == 124) || op.Organization.HierarchyDescendents.Any<OrganizationsHierarchy>(oh => oh.AncestorOrganization.ScopePermissions.Any<ScopePermission> (p => p.ApplicationRoleAccount.Account.UserName == HttpContext.Current.User.Identity.Name && p.ApplicationRoleAccount.Application.ApplicationId == 124))) > 0; } The query interceptors for Person, Student, Referral are all very similar, ie they traverse multiple same/similar tables to look for ScopePermissions as above. Sample Query var referrals = (from r in service.Referrals .Expand("Organization/ParentOrganization") .Expand("Educator/Person/Agent") .Expand("Student/Person/Agent") .Expand("Student") .Expand("Grade") .Expand("ProblemBehavior") .Expand("Location") .Expand("Motivation") .Expand("AdminDecision") .Expand("OthersInvolved") where r.DateCreated >= coupledays && r.DateDeleted == null select r); Any suggestions or tips would be greatly associated, for fixing my current implementation or in developing a new one, with the caveat that the database can't be changed and that ultimately I need to expose a large portion of the database via a web service that limits data access to the data authorized for, for the purpose of data integration with multiple outside parties. THANK YOU!!!

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• How to set the mechanize page encoding?

  - by Juan Medín

  Hi, I'm trying to get a page with an ISO-8859-1 encoding clicking on a link, so the code is similar to this: page_result = page.link_with( :text => 'link_text' ).click So far I get the result with a wrong encoding, so I see characters like: 'T?tulo:' instead of 'Título:' I've tried several approaches, including: Stating the encoding in the first request using the agent like: @page_search = @agent.get( :url => 'http://www.server.com', :headers => { 'Accept-Charset' => 'ISO-8859-1' } ) Stating the encoding for the page itself page_result.encoding = 'ISO-8859-1' But I must be doing something wrong: a simple puts always show the wrong characters. Do you know how to state the encoding? Thanks in advance, Added: Executable example: require 'rubygems' require 'mechanize' WWW::Mechanize::Util::CODE_DIC[:SJIS] = "ISO-8859-1" @agent = WWW::Mechanize.new @page = @agent.get( :url => 'http://www.mcu.es/webISBN/tituloSimpleFilter.do?cache=init&layout=busquedaisbn&language=es', :headers => { 'Accept-Charset' => 'utf-8' } ) puts @page.body

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• Remove duplicates from a sorted ArrayList while keeping some elements from the duplicates

  - by js82

  Okay at first I thought this would be pretty straightforward. But I can't think of an efficient way to solve this. I figured a brute force way to solve this but that's not very elegant. I have an ArrayList. Contacts is a VO class that has multiple members - name, regions, id. There are duplicates in ArrayList because different regions appear multiple times. The list is sorted by ID. Here is an example: Entry 0 - Name: John Smith; Region: N; ID: 1 Entry 1 - Name: John Smith; Region: MW; ID: 1 Entry 2 - Name: John Smith; Region: S; ID: 1 Entry 3 - Name: Jane Doe; Region: NULL; ID: 2 Entry 4 - Name: Jack Black; Region: N; ID: 3 Entry 6 - Name: Jack Black; Region: MW; ID: 3 Entry 7 - Name: Joe Don; Region: NE; ID: 4 I want to transform the list to below by combining duplicate regions together for the same ID. Therefore, the final list should have only 4 distinct elements with the regions combined. So the output should look like this:- Entry 0 - Name: John Smith; Region: N,MW,S; ID: 1 Entry 1 - Name: Jane Doe; Region: NULL; ID: 2 Entry 2 - Name: Jack Black; Region: N,MW; ID: 3 Entry 3 - Name: Joe Don; Region: NE; ID: 4 What are your thoughts on the optimal way to solve this? I am not looking for actual code but ideas or tips to go about the best way to get it done. Thanks for your time!!!

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• The specified type member 'EntityKey' is not supported in LINQ to Entities

  - by user300992

  I have 2 Entities "UserProfile" and "Agent", they are 1-many relationship. I want to do a query to get a list of Agents by giving the userProfileEntityKey. When I run it, I got this "The specified type member 'EntityKey' is not supported in LINQ to Entities" error. public IQueryable<Agent> GetAgentListByUserProfile(EntityKey userProfileEntityKey) { ObjectQuery<Agent> agentObjects = this.DataContext.AgentSet; IQueryable<Agent> resultQuery = (from p in agentObjects where p.UserProfile.EntityKey == userProfileEntityKey select p); return resultQuery; } So, what is the correct way to do this? Do I use p.UserProfile.UserId = UserId ? If that's the case, it's not conceptual anymore. Or should I write object query instead of LINQ query?

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• Variable number of two-dimensional arrays into one big array

  - by qlb

  I have a variable number of two-dimensional arrays. The first dimension is variable, the second dimension is constant. i.e.: Object[][] array0 = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... }; Object[][] array1 = { {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... }; ... Object[][] arrayi = ... I'm generating these arrays with a for-loop: for (int i = 0; i < filter.length; i++) { MyClass c = new MyClass(filter[i]); //data = c.getData(); } Where "filter" is another array which is filled with information that tells "MyClass" how to fill the arrays. "getData()" gives back one of the i number of arrays. Now I just need to have everything in one big two dimensional array. i.e.: Object[][] arrayComplete = { {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"}, {"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"}, ... {"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"}, {"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"}, ... ... }; In the end, I need a 2D array to feed my Swing TableModel. Any idea on how to accomplish this? It's blowing my mind right now.

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• GRAPH PROBLEM: find an algorithm to determine the shortest path from one point to another in a recta

  - by newba

  I'm getting such an headache trying to elaborate an appropriate algorithm to go from a START position to a EXIT position in a maze. For what is worth, the maze is rectangular, maxsize 500x500 and, in theory, is resolvable by DFS with some branch and bound techniques ... 10 3 4 7 6 3 3 1 2 2 1 0 2 2 2 4 2 2 5 2 2 1 3 0 2 2 2 2 1 3 3 4 2 3 4 4 3 1 1 3 1 2 2 4 2 2 1 Output: 5 1 4 2 Explanation: Our agent looses energy every time he gives a step and he can only move UP, DOWN, LEFT and RIGHT. Also, if the agent arrives with a remaining energy of zero or less, he dies, so we print something like "Impossible". So, in the input 10 is the initial agent's energy, 3 4 is the START position (i.e. column 3, line 4) and we have a maze 7x6. Think this as a kind of labyrinth, in which I want to find the exit that gives the agent a better remaining energy (shortest path). In case there are paths which lead to the same remaining energy, we choose the one which has the small number of steps, of course. I need to know if a DFS to a maze 500x500 in the worst case is feasible with these limitations and how to do it, storing the remaining energy in each step and the number of steps taken so far. The output means the agent arrived with remaining energy= 5 to the exit pos 1 4 in 2 steps. If we look carefully, in this maze it's also possible to exit at pos 3 1 (column 3, row 1) with the same energy but with 3 steps, so we choose the better one. With these in mind, can someone help me some code or pseudo-code? I have troubles working this around with a 2D array and how to store the remaining energy, the path (or number of steps taken)....

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• How to run node.js app on port 80? Are processes blocking my port?

  - by Lucas

  I believe the port 80 on my remote instance is blocked, and I am trying to run a node.js app using port 80. I have experimented with ports 3000 and 3002, and both ports are working fine, but I get an error when running on port 80. I suspect port 80 is blocked from my output of netstat -an below, but how can I find the process id's of the addresses that are blocking port 80 below? [lucas@ecoinstance]~/node/nodetest1$ netstat -an Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:3002 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:27017 127.0.0.1:51108 ESTABLISHED tcp 0 0 127.0.0.1:51106 127.0.0.1:27017 ESTABLISHED tcp 0 0 127.0.0.1:27017 127.0.0.1:51106 ESTABLISHED tcp 0 0 127.0.0.1:51107 127.0.0.1:27017 ESTABLISHED tcp 0 0 10.240.241.116:3002 174.61.171.61:36583 TIME_WAIT tcp 0 0 127.0.0.1:27017 127.0.0.1:51109 ESTABLISHED tcp 0 0 10.240.241.116:42423 169.254.169.254:80 ESTABLISHED tcp 0 0 127.0.0.1:51108 127.0.0.1:27017 ESTABLISHED tcp 0 532 10.240.241.116:22 174.61.171.61:56824 ESTABLISHED tcp 0 0 127.0.0.1:27017 127.0.0.1:51107 ESTABLISHED tcp 0 0 10.240.241.116:42412 169.254.169.254:80 ESTABLISHED tcp 0 0 127.0.0.1:51109 127.0.0.1:27017 ESTABLISHED tcp 0 0 127.0.0.1:51105 127.0.0.1:27017 ESTABLISHED tcp 0 0 10.240.241.116:42422 169.254.169.254:80 TIME_WAIT tcp 0 0 127.0.0.1:27017 127.0.0.1:51105 ESTABLISHED tcp6 0 0 :::22 :::* LISTEN udp 0 0 0.0.0.0:49948 0.0.0.0:* udp 0 0 0.0.0.0:68 0.0.0.0:* udp 0 0 10.240.241.116:123 0.0.0.0:* udp 0 0 127.0.0.1:123 0.0.0.0:* udp 0 0 0.0.0.0:123 0.0.0.0:* udp6 0 0 :::12151 :::* udp6 0 0 :::123 :::* Active UNIX domain sockets (servers and established) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 405680 /tmp/ssh-KdkxJfFLpKTC/agent.22 813 unix 2 [ ACC ] STREAM LISTENING 408230 /tmp/ssh-ofUeNNEwAqtP/agent.22 243 unix 2 [ ACC ] STREAM LISTENING 416227 /tmp/mongodb-27017.sock unix 2 [ ACC ] SEQPACKET LISTENING 3692 /run/udev/control unix 7 [ ] DGRAM 5286 /dev/log unix 2 [ ACC ] STREAM LISTENING 5318 /var/run/acpid.socket unix 2 [ ACC ] STREAM LISTENING 16170 /tmp//tmux-1000/default unix 2 [ ACC ] STREAM LISTENING 414450 /var/run/dbus/system_bus_socke And here is the log when trying to run on port 80 with node.js: [lucas@ecoinstance]~/node/nodetest1$ npm start > [email protected] start /home/lucas/node/nodetest1 > node ./bin/www events.js:72 throw er; // Unhandled 'error' event ^ Error: listen EACCES at errnoException (net.js:904:11) at Server._listen2 (net.js:1023:19) at listen (net.js:1064:10) at Server.listen (net.js:1138:5) at Function.app.listen (/home/lucas/node/nodetest1/node_modules/express/lib/applicati on.js:532:24) at Object.<anonymous> (/home/lucas/node/nodetest1/bin/www:7:18) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) npm ERR! [email protected] start: `node ./bin/www` npm ERR! Exit status 8 npm ERR! npm ERR! Failed at the [email protected] start script. npm ERR! This is most likely a problem with the nodetest1 package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! node ./bin/www npm ERR! You can get their info via: npm ERR! npm owner ls nodetest1 npm ERR! There is likely additional logging output above. npm ERR! System Linux 3.13-0.bpo.1-amd64 npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "start" npm ERR! cwd /home/lucas/node/nodetest1 npm ERR! node -v v0.10.28 npm ERR! npm -v 1.4.9 npm ERR! code ELIFECYCLE npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /home/lucas/node/nodetest1/npm-debug.log npm ERR! not ok code 0 And sudo netstat -lnp does not return any matching port 80's: [lucas@ecoinstance]~/node/nodetest1$ sudo netstat -lnp [48/648] Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Progr am name tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN 29160/mon god tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1976/sshd tcp6 0 0 :::22 :::* LISTEN 1976/sshd udp 0 0 0.0.0.0:49948 0.0.0.0:* 1604/dhcl ient udp 0 0 0.0.0.0:68 0.0.0.0:* 1604/dhcl ient udp 0 0 10.240.241.116:123 0.0.0.0:* 2076/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 2076/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 2076/ntpd udp6 0 0 :::12151 :::* 1604/dhcl ient udp6 0 0 :::123 :::* 2076/ntpd Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ACC ] STREAM LISTENING 405680 22814/ssh-agent /tmp/ssh-K dkxJfFLpKTC/agent.22813 unix 2 [ ACC ] STREAM LISTENING 408230 24049/ssh-agent /tmp/ssh-o fUeNNEwAqtP/agent.22243 unix 2 [ ACC ] STREAM LISTENING 416227 29160/mongod /tmp/mongo db-27017.sock unix 2 [ ACC ] SEQPACKET LISTENING 3692 284/udevd /run/udev/ control unix 2 [ ACC ] STREAM LISTENING 5318 1798/acpid /var/run/a cpid.socket unix 2 [ ACC ] STREAM LISTENING 16170 5177/tmux /tmp//tmux -1000/default unix 2 [ ACC ] STREAM LISTENING 414450 28213/dbus-daemon /var/run/d bus/system_bus_socket unix 2 [ ACC ] STREAM LISTENING 404225 22324/1 /tmp/ssh-9 TlDmu4bjl/agent.22324

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• How to make teamcity's svn checkout more verbose?

  - by Benju

  We have a very large svn external containing about 30,000 500k files. This checkout can take a long time and we would like to see the progress in the TeamCity logs as it happens. Is there a way to use a more verbose logging when doing the svn checkout than just.... [19:26:00]: Updating sources: Agent side checkout... [19:26:00]: [Updating sources: Agent side checkout...] Will perform clean checkout. Reason: Checkout directory is empty or doesn't exist [19:26:00]: [Updating sources: Agent side checkout...] Cleaning /opt/TeamCity/buildAgent/work/937995fe3d15f1e7 [19:26:00]: [Updating sources: Agent side checkout...] VCS Root: guru 6 trunk with externals [19:26:00]: [VCS Root: guru 6 trunk with externals] revision: 6521_2010/04/27 19:25:58 -0500

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• What is correct HTTP status code when redirecting to a login page?

  - by PHP_Jedi

  When a user is not logged in and tries to access an page that requires login, what is the correct HTTP status code for a redirect to the login page? I don't feel that any of the 3xx fit that description. 10.3.1 300 Multiple Choices The requested resource corresponds to any one of a set of representations, each with its own specific location, and agent- driven negotiation information (section 12) is being provided so that the user (or user agent) can select a preferred representation and redirect its request to that location. Unless it was a HEAD request, the response SHOULD include an entity containing a list of resource characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content- Type header field. Depending upon the format and the capabilities of the user agent, selection of the most appropriate choice MAY be performed automatically. However, this specification does not define any standard for such automatic selection. If the server has a preferred choice of representation, it SHOULD include the specific URI for that representation in the Location field; user agents MAY use the Location field value for automatic redirection. This response is cacheable unless indicated otherwise. 10.3.2 301 Moved Permanently The requested resource has been assigned a new permanent URI and any future references to this resource SHOULD use one of the returned URIs. Clients with link editing capabilities ought to automatically re-link references to the Request-URI to one or more of the new references returned by the server, where possible. This response is cacheable unless indicated otherwise. The new permanent URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s). If the 301 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued. Note: When automatically redirecting a POST request after receiving a 301 status code, some existing HTTP/1.0 user agents will erroneously change it into a GET request. 10.3.3 302 Found The requested resource resides temporarily under a different URI. Since the redirection might be altered on occasion, the client SHOULD continue to use the Request-URI for future requests. This response is only cacheable if indicated by a Cache-Control or Expires header field. The temporary URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s). If the 302 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued. Note: RFC 1945 and RFC 2068 specify that the client is not allowed to change the method on the redirected request. However, most existing user agent implementations treat 302 as if it were a 303 response, performing a GET on the Location field-value regardless of the original request method. The status codes 303 and 307 have been added for servers that wish to make unambiguously clear which kind of reaction is expected of the client. 10.3.4 303 See Other The response to the request can be found under a different URI and SHOULD be retrieved using a GET method on that resource. This method exists primarily to allow the output of a POST-activated script to redirect the user agent to a selected resource. The new URI is not a substitute reference for the originally requested resource. The 303 response MUST NOT be cached, but the response to the second (redirected) request might be cacheable. The different URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s). Note: Many pre-HTTP/1.1 user agents do not understand the 303 status. When interoperability with such clients is a concern, the 302 status code may be used instead, since most user agents react to a 302 response as described here for 303. 10.3.5 304 Not Modified If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields. The response MUST include the following header fields: - Date, unless its omission is required by section 14.18.1 If a clockless origin server obeys these rules, and proxies and clients add their own Date to any response received without one (as already specified by [RFC 2068], section 14.19), caches will operate correctly. - ETag and/or Content-Location, if the header would have been sent in a 200 response to the same request - Expires, Cache-Control, and/or Vary, if the field-value might differ from that sent in any previous response for the same variant If the conditional GET used a strong cache validator (see section 13.3.3), the response SHOULD NOT include other entity-headers. Otherwise (i.e., the conditional GET used a weak validator), the response MUST NOT include other entity-headers; this prevents inconsistencies between cached entity-bodies and updated headers. If a 304 response indicates an entity not currently cached, then the cache MUST disregard the response and repeat the request without the conditional. If a cache uses a received 304 response to update a cache entry, the cache MUST update the entry to reflect any new field values given in the response. 10.3.6 305 Use Proxy The requested resource MUST be accessed through the proxy given by the Location field. The Location field gives the URI of the proxy. The recipient is expected to repeat this single request via the proxy. 305 responses MUST only be generated by origin servers. Note: RFC 2068 was not clear that 305 was intended to redirect a single request, and to be generated by origin servers only. Not observing these limitations has significant security consequences. 10.3.7 306 (Unused) The 306 status code was used in a previous version of the specification, is no longer used, and the code is reserved. 10.3.8 307 Temporary Redirect The requested resource resides temporarily under a different URI. Since the redirection MAY be altered on occasion, the client SHOULD continue to use the Request-URI for future requests. This response is only cacheable if indicated by a Cache-Control or Expires header field. The temporary URI SHOULD be given by the Location field in the response. Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s) , since many pre-HTTP/1.1 user agents do not understand the 307 status. Therefore, the note SHOULD contain the information necessary for a user to repeat the original request on the new URI. If the 307 status code is received in response to a request other than GET or HEAD, the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user, since this might change the conditions under which the request was issued. I'm using 302 for now, until I find THE correct answer.

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• Ruby encoding problem

  - by Fossmo

  I'm just starting to learn Ruby and have a problem with encoding; require 'rubygems' require 'mechanize' agent = Mechanize.new agent.get('myurl.....') agent.page.search('#reciperesult a').each do |item| c = Mechanize.new c.get(item.attributes['href']) puts c.page.search('#ingredients li').text end The output text are shown like this h+©nsekj+©tt when it should have been shown like this hønsekjøtt. I'm using Ruby 1.8.7. Can anybody point me in the right direction?

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• Formatting the parent and child nodes of a Treeview that is populated by a XML file

  - by Marina

  Hello Everyone, I'm very new to xml so I hope I'm not asking any silly question here. I'm currently working on populating a treeview from an XML file that is not hierarchically structured. In the xml file that I was given the child and parent nodes are defined within the attributes of the item element. How would I be able to utilize the attributes in order for the treeview to populate in the right hierarchical order. (Example Mary Jane should be a child node of Peter Smith). At present all names are under one another. root <item parent_id="0" id="1"><content><name>Peter Smith</name></content></item> <item parent_id="1" id="2"><content><name>Mary Jane</name></content></item> <item parent_id="1" id="7"><content><name>Lucy Lu</name></content></item> <item parent_id="2" id="3"><content><name>Informatics Team</name></content></item> <item parent_id="3" id="4"><content><name>Sandy Chu</name></content></item> <item parent_id="4" id="5"><content><name>John Smith</name></content></item> <item parent_id="5" id="6"><content><name>Jane Smith</name></content></item> /root Thank you for all of your help, Marina

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• bash: how to know NUM option in grep -A -B "on the fly" ?

  - by Michael Mao

  Hello everyone: I am trying to analyze my agent results from a collection of 20 txt files here. If you wonder about the background info, please go see my page, what I am doing here is just one step. Basically I would like to take only my agent's result out of the messy context, so I've got this command for a single file: cat run15.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' This means : after the regex match, continue forward by 50 lines, stop, then match a line separator starts with "==", go back by 50 lines, if possible (This would certainly clash the very first line). This approach depends on the fact that the hard-coded line number counter 50, would be just fine to get exactly one line separator. And this would not work if I do the following code: cat run*.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' The output would be a mess... My question is: how to make sure grep knows exactly when to stop going forward, and when to stop getting backward? Any suggestion or hint is much appreciated.

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• Problem with load testing Web Service - VSTS 2008

  - by Carlos

  Hello, I have a webtest with makes a simple call to a WebService which looks like that: MyWebService webService = new MyWebService(); webService.Timeout = 180000; webService.myMethod(); I am not using ThinkTimes, also the Run Duration is set to 5 minutes. When I ran this test simulating only 1 user, I check the counters and I found something like that: Tests Total: 4500 Network Interface\Bytes sent (agent machine): 35,500 Then I ran the same tests, but this time simulating 2 users and I got something like that: Tests Total: 2225 Network Interface\Bytes sent (agent machine): 30,500 So when I increased the numbers of users the tests/sec was half than when I use only 1 user and the bytes sent by the agent was also lower. I think it is strange, because it doesn't seems I have a bottleneck in my agent machine since CPU is never higher than 30% and I have over 1.5GB of RAM free, also my network utilization is like 0.5% of its capacity. In order to troubleshot this I ran a test using Step Pattern, the simulated users went from 20 to 800 users. When I check the requests/sec it is practically constant through the whole test, so it is clear there is something in my test or my environment which is preventing the number of requests from gets higher. It would be a expected behavior if the "response time" was getting higher because it would tell me the requests wasn't been processed properly, but the strange thing is the response time is practically constant all the time and it is pretty low actually. I have no idea why my agent can't send more requests when I increase the numbers of users, any help/tip/guess would be really appreciate.

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• Why Eventmachine Defer slower than Ruby Thread?

  - by allenwei

  I have two scripts which using mechanize to fetch google index page. I assuming Eventmachine will faster than ruby thread, but not. Eventmachine code cost "0.24s user 0.08s system 2% cpu 12.682 total" Ruby Thread code cost "0.22s user 0.08s system 5% cpu 5.167 total " Am I use eventmachine in wrong way? Who can explain it to me, thanks! 1 Eventmachine require 'rubygems' require 'mechanize' require 'eventmachine' trap("INT") {EM.stop} EM.run do num = 0 operation = proc { agent = Mechanize.new sleep 1 agent.get("http://google.com").body.to_s.size } callback = proc { |result| sleep 1 puts result num+=1 EM.stop if num == 9 } 10.times do EventMachine.defer operation, callback end end 2 Ruby Thread require 'rubygems' require 'mechanize' threads = [] 10.times do threads << Thread.new do agent = Mechanize.new sleep 1 puts agent.get("http://google.com").body.to_s.size sleep 1 end end threads.each do |aThread| aThread.join end

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• what is the point of heterogenous arrays?

  - by aharon

  I know that more-dynamic-than-Java languages, like Python and Ruby, often allow you to place objects of mixed types in arrays, like so: ["hello", 120, ["world"]] What I don't understand is why you would ever use a feature like this. If I want to store heterogenous data in Java, I'll usually create an object for it. For example, say a User has int ID and String name. While I see that in Python/Ruby/PHP you could do something like this: [["John Smith", 000], ["Smith John", 001], ...] this seems a bit less safe/OO than creating a class User with attributes ID and name and then having your array: [<User: name="John Smith", id=000>, <User: name="Smith John", id=001>, ...] where those <User ...> things represent User objects. Is there reason to use the former over the latter in languages that support it? Or is there some bigger reason to use heterogenous arrays? N.B. I am not talking about arrays that include different objects that all implement the same interface or inherit from the same parent, e.g.: class Square extends Shape class Triangle extends Shape [new Square(), new Triangle()] because that is, to the programmer at least, still a homogenous array as you'll be doing the same thing with each shape (e.g., calling the draw() method), only the methods commonly defined between the two.

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• Mechanize complex form input name

  - by ADAM

  Hi there i am trying to access a form in mechanize with ugly characters in the object name similar to this agent = Mechanize.new page = agent.get('http://domain.com) form = page.forms[0] form.ct600$Main$LastNameTextBox = "whatever" page = agent.submit(form) The problem is the $ in the html name is messing with ruby because Is there another method i could use ie: form.element_by_name("ct600$Main$LastNameTextBox") = "whatever" Unfortunately i cant change the html

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• Parsing two-dimensional text

  - by alexbw

  I need to parse text files where relevant information is often spread across multiple lines in a nonlinear way. An example: 1234 1 IN THE SUPERIOR COURT OF THE STATE OF SOME STATE 2 IN AND FOR THE COUNTY OF SOME COUNTY 3 UNLIMITED JURISDICTION 4 --o0o-- 5 6 JOHN SMITH and JILL SMITH, ) ) 7 Plaintiffs, ) ) 8 vs. ) No. 12345 ) 9 ACME CO, et al., ) ) 10 Defendants. ) ___________________________________) I need to pull out Plaintiff and Defendant identities. These transcripts have a very wide variety of formattings, so I can't always count on those nice parentheses being there, or the plaintiff and defendant information being neatly boxed off, e.g.: 1 SUPREME COURT OF THE STATE OF SOME OTHER STATE COUNTY OF COUNTYVILLE 2 First Judicial District Important Litigation 3 --------------------------------------------------X THIS DOCUMENT APPLIES TO: 4 JOHN SMITH, 5 Plaintiff, Index No. 2000-123 6 DEPOSITION 7 - against - UNDER ORAL EXAMINATION 8 OF JOHN SMITH, 9 Volume I 10 ACME CO, et al, 11 Defendants. 12 --------------------------------------------------X The two constants are: "Plaintiff" will occur after the name of the plaintiff(s), but not necessarily on the same line. Plaintiffs and defendants' names will be in upper case. Any ideas?

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• bash: hwo to know NUM option in grep -A -B "on the fly" ?

  - by Michael Mao

  Hello everyone: I am trying to analyze my agent results from a collection of 20 txt files here. If you wonder about the background info, please go see my page, what I am doing here is just one step. Basically I would like to take only my agent's result out of the messy context, so I've got this command for a single file: cat run15.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' This means : after the regex match, continue forward by 50 lines, stop, then match a line separator starts with "==", go back by 50 lines, if possible (This would certainly clash the very first line). This approach depends on the fact that the hard-coded line number counter 50, would be just fine to get exactly one line separator. And this would not work if I do the following code: cat run*.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' The output would be a mess... My question is: how to make sure grep knows exactly when to stop going forward, and when to stop getting backward? Any suggestion or hint is much appreciated.

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• Modify MySQL INSERT statement to omit the insertion of certain rows

  - by dave

  I'm trying to expand a little on a statement that I received help with last week. As you can see, I'm setting up a temporary table and inserting rows of student data from a recently administered test for a few dozen schools. When the rows are inserted, they are sorted by the score (totpct_stu, high to low) and the row_number is added, with 1 representing the highest score, etc. I've learned that there were some problems at school #9999 in SMITH's class (every student made a perfect score and they were the only students in the district to do so). So, I do not want to import SMITH's class. As you can see, I DELETED SMITH's class, but this messed up the row numbering for the remainder of student at the school (e.g., high score row_number is now 20, not 1). How can I modify the INSERT statement so as to not insert this class? Thanks! DROP TEMPORARY TABLE IF EXISTS avgpct ; CREATE TEMPORARY TABLE avgpct_1 ( sch_code VARCHAR(3), schabbrev VARCHAR(75), teachername VARCHAR(75), totpct_stu DECIMAL(5,1), row_number SMALLINT, dummy VARCHAR(75) ); -- ---------------------------------------- INSERT INTO avgpct SELECT sch_code , schabbrev , teachername , totpct_stu , @num := IF( @GROUP = schabbrev, @num + 1, 1 ) AS row_number , @GROUP := schabbrev AS dummy FROM sci_rpt WHERE grade = '05' AND totpct_stu >= 1 -- has a valid score ORDER BY sch_code, totpct_stu DESC ; -- --------------------------------------- -- select * from avgpct ; -- --------------------------------------- DELETE FROM avgpct_1 WHERE sch_code = '9999' AND teachername = 'SMITH' ;

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• Ruby Mechanize - Basic Get Failing

  - by hutch

  a = WWW::Mechanize.new { |agent| agent.user_agent_alias = 'Mac Safari' agent.history.max_size=0 } page = a.get('http://livingsocial.com/deals?preferred_city=18') Trying a very basic GET request using mechanize but get a 500, yet when I CURL I have no problems. Is there a problem with including parameters in a get() call? I know I am missing something simple

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• Operant conditioning algorithm?

  - by Ken

  What's the best way to implement real time operant conditioning (supervised reward/punishment-based learning) for an agent? Should I use a neural network (and what type)? Or something else? I want the agent to be able to be trained to follow commands like a dog. The commands would be in the form of gestures on a touchscreen. I want the agent to be able to be trained to follow a path (in continuous 2D space), make behavioral changes on command (modeled by FSM state transitions), and perform sequences of actions. The agent would be in a simulated physical environment.

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