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  • Lightweight spinlocks built from GCC atomic operations?

    - by Thomas
    I'd like to minimize synchronization and write lock-free code when possible in a project of mine. When absolutely necessary I'd love to substitute light-weight spinlocks built from atomic operations for pthread and win32 mutex locks. My understanding is that these are system calls underneath and could cause a context switch (which may be unnecessary for very quick critical sections where simply spinning a few times would be preferable). The atomic operations I'm referring to are well documented here: http://gcc.gnu.org/onlinedocs/gcc-4.4.1/gcc/Atomic-Builtins.html Here is an example to illustrate what I'm talking about. Imagine a RB-tree with multiple readers and writers possible. RBTree::exists() is read-only and thread safe, RBTree::insert() would require exclusive access by a single writer (and no readers) to be safe. Some code: class IntSetTest { private: unsigned short lock; RBTree<int>* myset; public: // ... void add_number(int n) { // Aquire once locked==false (atomic) while (__sync_bool_compare_and_swap(&lock, 0, 0xffff) == false); // Perform a thread-unsafe operation on the set myset->insert(n); // Unlock (atomic) __sync_bool_compare_and_swap(&lock, 0xffff, 0); } bool check_number(int n) { // Increment once the lock is below 0xffff u16 savedlock = lock; while (savedlock == 0xffff || __sync_bool_compare_and_swap(&lock, savedlock, savedlock+1) == false) savedlock = lock; // Perform read-only operation bool exists = tree->exists(n); // Decrement savedlock = lock; while (__sync_bool_compare_and_swap(&lock, savedlock, savedlock-1) == false) savedlock = lock; return exists; } }; (lets assume it need not be exception-safe) Is this code indeed thread-safe? Are there any pros/cons to this idea? Any advice? Is the use of spinlocks like this a bad idea if the threads are not truly concurrent? Thanks in advance. ;)

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  • Documentation for java.util.concurrent.locks.ReentrantReadWriteLock

    - by Andrei Taptunov
    Disclaimer: I'm not very good at Java and just comparing read/writer locks between C# and Java to understand this topic better & decisions behind both implementations. There is JavaDoc about ReentrantReadWriteLock. It states the following about upgrade/downgrade for locks: Lock downgrading ... However, upgrading from a read lock to the write lock is not possible. It also has the following example that shows manual upgrade from read lock to write lock: // Here is a code sketch showing how to exploit reentrancy // to perform lock downgrading after updating a cache void processCachedData() { rwl.readLock().lock(); if (!cacheValid) { // upgrade lock manually #1: rwl.readLock().unlock(); // must unlock first to obtain writelock #2: rwl.writeLock().lock(); if (!cacheValid) { // recheck ... } ... } use(data); rwl.readLock().unlock(); Does it mean that actually the sample from above may not behave correctly in some cases - I mean there is no lock between lines #1 & #2 and underlying structure is exposed to changes from other threads. So it can not be considered as the correct way to upgrade the lock or do I miss something here?

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  • How to get back to Lock Screen from Password screen in Microsoft Surface?

    - by GaTechThomas
    Similar to question, Can I bring the lock screen back after dismissing it? ('go back a screen' from password entry) How do I go back to the Lock Screen once I've gone to the password screen in Microsoft Surface tablet? This is a different mechanism from using the referenced question in that no physical keyboard is available. Alternately, can the timout on the password screen be shortened?

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  • hp smart array lock up code 0x15, what is that? (or where can I get a list of descriptions of HP smart array controller lock up codes)

    - by user47650
    Hi, I've had a couple of Dl180 6g boxes hung over the last week, each have a P410 smart array controller. upon reboot the server has indicated that a controller failure event occurred and the previous lock up code was 0x15 - the server rebooted without issue. However there was nothing in the IML log, but the ADU report provided the following; Trap Address High Or Post Results Lockup Reason Or Post Error RIS Updates Or Post Error Detail Firmware Version Trap Address Low 0x8087 0x0015 0x0000033e 0x015e 0xd65c any suggestions on what that code is, my google fu failed. And hp support have not responded with any detail as yet.

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  • Error when logging in with Machinist in Shoulda test

    - by user303747
    I am having some trouble getting the right usage of Machinist and Shoulda in my testing. Here is my test: context "on POST method rating" do p = Product.make u = nil setup do u = login_as post :vote, :rating => 3, :id => p end should "set rating for product to 3" do assert_equal p.get_user_vote(u), 3 end And here's my blueprints: Sham.login { Faker::Internet.user_name } Sham.name { Faker::Lorem.words} Sham.email { Faker::Internet.email} Sham.body { Faker::Lorem.paragraphs(2)} User.blueprint do login password "testpass" password_confirmation { password } email end Product.blueprint do name {Sham.name} user {User.make} end And my authentication test helper: def login_as(u = nil) u ||= User.make() @controller.stubs(:current_user).returns(u) u end The error I get is: /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/validations.rb:1090:in `save_without_dirty!': Validation failed: Login has already been taken, Email has already been taken (ActiveRecord::RecordInvalid) from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/dirty.rb:87:in `save_without_transactions!' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/transactions.rb:200:in `save!' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/transactions.rb:182:in `transaction' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/transactions.rb:200:in `save!' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/transactions.rb:208:in `rollback_active_record_state!' from /home/jason/moderndarwin/vendor/rails/activerecord/lib/active_record/transactions.rb:200:in `save!' from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist/active_record.rb:55:in `make' from /home/jason/moderndarwin/test/blueprints.rb:37 from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist.rb:77:in `generate_attribute_value' from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist.rb:46:in `method_missing' from /home/jason/moderndarwin/test/blueprints.rb:37 from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist.rb:20:in `instance_eval' from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist.rb:20:in `run' from /usr/lib/ruby/gems/1.8/gems/machinist-1.0.6/lib/machinist/active_record.rb:53:in `make' from ./test/functional/products_controller_test.rb:25:in `__bind_1269805681_945912' from /home/jason/moderndarwin/vendor/gems/thoughtbot-shoulda-2.10.2/lib/shoulda/context.rb:293:in `call' from /home/jason/moderndarwin/vendor/gems/thoughtbot-shoulda-2.10.2/lib/shoulda/context.rb:293:in `merge_block' from /home/jason/moderndarwin/vendor/gems/thoughtbot-shoulda-2.10.2/lib/shoulda/context.rb:288:in `initialize' from /home/jason/moderndarwin/vendor/gems/thoughtbot-shoulda-2.10.2/lib/shoulda/context.rb:169:in `new' from /home/jason/moderndarwin/vendor/gems/thoughtbot-shoulda-2.10.2/lib/shoulda/context.rb:169:in `context' from ./test/functional/products_controller_test.rb:24 I can't figure out what it is I'm doing wrong... I have tested the login_as with my auth (Authlogic) in my user_controller testing. Any pointers in the right direction would be much appreciated!

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  • composite-video-to-usb adaptor

    - by sawa
    I bought a composite-video-to-usb adaptor. I want to stream video game in ubuntu. How can I do that? My environment: Monoprice USB Video and Audio Grabber Ubuntu 11.04 The relevant output of lsusb: Bus 001 Device 011: ID 0572:262a Conexant Systems (Rockwell), Inc. The relevant output of sudo lshw: *-usb:0 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #4 vendor: Intel Corporation physical id: 1a bus info: pci@0000:00:1a.0 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:16 ioport:f0e0(size=32) *-usb:1 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #5 vendor: Intel Corporation physical id: 1a.1 bus info: pci@0000:00:1a.1 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:21 ioport:f0c0(size=32) *-usb:2 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #6 vendor: Intel Corporation physical id: 1a.2 bus info: pci@0000:00:1a.2 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:18 ioport:f0a0(size=32) *-usb:3 description: USB Controller product: 82801JI (ICH10 Family) USB2 EHCI Controller #2 vendor: Intel Corporation physical id: 1a.7 bus info: pci@0000:00:1a.7 version: 00 width: 32 bits clock: 33MHz capabilities: pm debug ehci bus_master cap_list configuration: driver=ehci_hcd latency=0 resources: irq:18 memory:e0525c00-e0525fff *-multimedia description: Audio device product: 82801JI (ICH10 Family) HD Audio Controller vendor: Intel Corporation physical id: 1b bus info: pci@0000:00:1b.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=HDA Intel latency=0 resources: irq:43 memory:e0520000-e0523fff *-usb:4 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #1 vendor: Intel Corporation physical id: 1d bus info: pci@0000:00:1d.0 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:23 ioport:f080(size=32) *-usb:5 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #2 vendor: Intel Corporation physical id: 1d.1 bus info: pci@0000:00:1d.1 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:19 ioport:f060(size=32) *-usb:6 description: USB Controller product: 82801JI (ICH10 Family) USB UHCI Controller #3 vendor: Intel Corporation physical id: 1d.2 bus info: pci@0000:00:1d.2 version: 00 width: 32 bits clock: 33MHz capabilities: uhci bus_master cap_list configuration: driver=uhci_hcd latency=0 resources: irq:18 ioport:f040(size=32) *-usb:7 description: USB Controller product: 82801JI (ICH10 Family) USB2 EHCI Controller #1 vendor: Intel Corporation physical id: 1d.7 bus info: pci@0000:00:1d.7 version: 00 width: 32 bits clock: 33MHz capabilities: pm debug ehci bus_master cap_list configuration: driver=ehci_hcd latency=0 resources: irq:23 memory:e0525800-e0525bff The relevant output of dmesg: [18953.220035] usb 1-1: new high speed USB device using ehci_hcd and address 6 [19964.761076] Linux video capture interface: v2.00 [19964.767112] usbcore: registered new interface driver uvcvideo [19964.767115] USB Video Class driver (v1.0.0)

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  • Why Buy Hardrives with storage server from a vendor?

    - by Mark
    Hi all, Im just browsing around at storage server's like the Dell MD100/ MD3000 and the Sun J4200 and although the storage server seems reasonable (approx $3000-$4000 AUD) the hard-drives that you buy to go along with them seems exorbitantly expensive. And I'm not sure why. Surely at most they are using good quality RAID level 7200rpm SATA hdd, but even then they are still charging almost 4 times the price. What is the advantage to buying these from them. I can see if one fails then the vendor replacing it is convenient. But at that price you could buy double the amount of hdd and just claim on warranty directly with the manufacturer. It would be much cheaper and you wouldn't be relying on someone else to fix your problems. Is this the case of "you don't get fired if you buy IBM?" mentality or is there some reason I'm not grasping here? Cheers Mark

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  • keyboard status leds not working

    - by feroxy
    Running Ubuntu 13.10 64bit The status leds are not working correctly on my new keyboard under Ubuntu. Pressing Caps Lock and Num Lock do not cause the leds to turn on/off to reflect their status. Rather I have a num lock led stuck on, and a caps lock led that never turns on. The actual function of the caps lock and num lock is unaffected though, just the leds not working. I am able to use ¨setleds¨ to turn the leds on an off from a console session, so I don´t think there's any hardware problem. Also the keyboard does not have the same problem under windows 7. Anyone have any solutions? thanks! The keyboard in question is a Monoprice mechanical gaming keyboard: http://www.amazon.co.uk/gp/product/B0081TQ83K/ http://www.monoprice.com/Product?c_id=114&cp_id=11401&cs_id=1140102&p_id=9181&seq=1&format=2 Which itself seems to be an own branded Qpad MK-85

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  • How do engines avoid "Phase Lock" (multiple objects in same location) in a Physics Engine?

    - by C0M37
    Let me explain Phase Lock first: When two objects of non zero mass occupy the same space but have zero energy (no velocity). Do they bump forever with zero velocity resolution vectors or do they just stay locked together until an outside force interacts? In my home brewed engine, I realized that if I loaded a character into a tree and moved them, they would signal a collision and hop back to their original spot. I suppose I could fix this by implementing impulses in the event of a collision instead of just jumping back to the last spot I was in (my implementation kind of sucks). But while I make my engine more robust, I'm just curious on how most other physics engines handle this case. Do objects that start in the same spot with no movement speed just shoot out from each other in a random direction? Or do they sit there until something happens? Which option is generally the best approach?

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  • Chrome 22 disponible : une version dédiée aux jeux 3D en ligne, API Pointer Lock et améliorations pour Windows 8 et écrans Retina

    Chrome 22 disponible : une version destinée aux FPS et jeux 3D en ligne Support de l'API « Pointer Lock » et améliorations pour Windows 8 et écrans Retina Google ne cesse d'améliorer son navigateur qui devient une véritable plateforme polyvalente. La firme met à jour son navigateur Web Chrome afin qu'il soit plus exploitable par les adeptes et développeurs de FPS (jeux de tirs subjectifs) et de jeux 3D en ligne. [IMG]http://ftp-developpez.com/gordon-fowler/Chrome%20Logo.png[/IMG] Google vient de sortir une nouvelle version "majeure" et stable de Chrome, 22 au compteur. Celle-ci inclut désormais le support pour l'API JavaScript « Pointer...

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  • What options exist when the vendor does not supply an ADB driver for an Android device?

    - by STATUS_ACCESS_DENIED
    So I bought an Android phone and the vendor does not offer any drivers whatsoever. The Android SDK and the drivers that come with it don't seem to work with the device, but the device itself reports as Android 2.2.1. Other users have reported that the drivers of the Nook Color worked for them, but I cannot confirm this, after trying. What options do I have to connect to the device (and ultimately to root it)? Is it truly just the .inf file that I need to manipulate in order to make the device ID known to Windows? After all there are tools to figure out those strings while the device is connected (although "unknown") ...

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  • Windows 2008 R2 file share - any way to "lock it down" outside of a 3rd party app?

    - by TheCleaner
    I have a 3rd party app that "makes a call" to write files to a file share on our network using the currently logged in credentials of the Windows domain user. Meaning the 3rd party app doesn't pass the apps credentials but simply issues a behind the scenes copy command to take a source file specified and copy/move it to the destination "repository" on the file share. The basic premise is that it keeps revisions/approvals for Document Control (think svn/git I guess, similar to this question: Lock down Windows folder to only be updatable by SVN). This all works fine...but here's my issue: I need a way to lock down the file share from being accessed/modified outside of using the 3rd party app (meaning prevent explorer/word/excel/etc from getting to that share). I know I can do the following: make the share a hidden share ($) - this definitely helps. Most users would have zero clue on how to get to such a share. Solves probably 95% of my issue. go one step further and set the "Hidden" attribute on the folders in the hidden share - this would go a little further in that even if a user knows the path to the hidden share like \\server\hidden$ they still won't see folders in that share without changing their explorer options to "show hidden files/folder Any other ideas on how I can lock this down? The users still need modify rights to this share/folders since the 3rd party app relies on their Windows permissions to that location when copying the files into it. I can't really use 3rd party tools to password protect the folder/share without causing the 3rd party app functions to fail.

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  • What language and tools can I use to create a simple game with child-lock (capture all key press) for Windows? [closed]

    - by scw
    I'm writing an open source program that changes colors & plays sounds when keys are pressed. I want it to run in full screen mode and have a child-lock so kids can't exit accidentally. I want it to capture all keys including ctrl alt delete. (So it's partially a game, but partially windows utility.) My target OS is Windows 7 (32 & 64 bit), keeping Windows 8 in mind. My options: Visual Studio using .net C# Windows Forms - the devil I know. But not a "game" platform, which is why I'm asking this question. Visual Studio & XNA - have never used XNA, not sure of capabilities or support future Python - What flavor, what modules, what IDE? I've never done anything with Python but I found a couple of similar open source projects in python. Something else that I don't know about? Any input is appreciated.

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  • Why is cron mailing me program output even though I've redirected to /dev/null?

    - by Server Fault
    I'm trying to restart a system process through cron and getting emailed the startup output of the process. I thought redirecting STDOUT and SDTERR to /dev/null would "silence" the output but alas, this has not work. How can I get cron to silently restart this service? crontab entry: 0 6 * * * service sympa stop &>/dev/null; service sympa start &> /dev/null sample output from restart email: Stopping Sympa bounce manager bounced ...done. * Stopping Sympa task manager task_manager ...done. * Stopping Sympa mailing list archive manager archived ...done. * Stopping Sympa mailing list manager sympa ...done. ... waiting Prototype mismatch: sub Lock::LOCK_SH () vs none at /home/sympa/bin/Lock.pm line 38. Constant subroutine LOCK_SH redefined at /home/sympa/bin/Lock.pm line 38. Prototype mismatch: sub Lock::LOCK_EX () vs none at /home/sympa/bin/Lock.pm line 39. Constant subroutine LOCK_EX redefined at /home/sympa/bin/Lock.pm line 39. Prototype mismatch: sub Lock::LOCK_NB () vs none at /home/sympa/bin/Lock.pm line 40. Constant subroutine LOCK_NB redefined at /home/sympa/bin/Lock.pm line 40.

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  • How can I start hostednetwork on Windows 7?

    - by Pirozek
    When I type in admin console command to start hostednetwork netsh wlan start hostednetwork it gives me this: The hosted network couldn't be started. The group or resource is not in the correct state to perform the requested operation. There is a hotfix from Microsoft but it didn't help me. Any advice? C:\Users\Pirozek>netsh wlan show driver Interface name: Wireless Network Connection 3 Driver : D-Link AirPlus DWL-G520 Wireless PCI Adapter(rev .B) Vendor : Atheros Communications Inc. Provider : Atheros Communications Inc. Date : 8.7.2009 Version : 8.0.0.171 INF file : C:\Windows\INF\oem108.inf Files : 2 total C:\Windows\system32\DRIVERS\athrx.sys C:\Windows\system32\drivers\vwifibus.sys Type : Native Wi-Fi Driver Radio types supported : 802.11b 802.11g FIPS 140-2 mode supported : Yes Hosted network supported : Yes Authentication and cipher supported in infrastructure mode: Open None Open WEP-40bit Shared WEP-40bit Open WEP-104bit Shared WEP-104bit Open WEP Shared WEP WPA-Enterprise TKIP WPA-Personal TKIP WPA2-Enterprise TKIP WPA2-Personal TKIP Vendor defined TKIP WPA2-Enterprise Vendor defined Vendor defined Vendor defined WPA-Enterprise CCMP WPA-Personal CCMP WPA2-Enterprise CCMP Vendor defined CCMP WPA2-Enterprise Vendor defined Vendor defined Vendor defined WPA2-Personal CCMP Authentication and cipher supported in ad-hoc mode: Open None Open WEP-40bit Open WEP-104bit Open WEP WPA2-Personal CCMP

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  • is there a simple timed lock algorithm avoiding deadlock on multiple mutexes?

    - by Vicente Botet Escriba
    C++0x thread library or Boost.thread define a non-member variadic template function that locks all mutex at once that helps to avoid deadlock. template <class L1, class L2, class... L3> void lock(L1&, L2&, L3&...); The same can be applied to a non-member variadic template function try_lock_until, which locks all the mutex until a given time is reached that helps to avoid deadlock like lock(...). template <class Clock, class Duration, class L1, class L2, class... L3> void try_lock_until( const chrono::time_point<Clock,Duration>& abs_time, L1&, L2&, L3&...); I have an implementation that follows the same design as the Boost function boost::lock(...). But this is quite complex. As I can be missing something evident I wanted to know if: is there a simple timed lock algorithm avoiding deadlock on multiple mutexes? If no simple implementation exists, can this justify a proposal to Boost? P.S. Please avoid posting complex solutions.

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  • H12 timeout error on Heroku

    - by snowangel
    Can anyone shed some light on what's causing this timeout error on Heroku (at 2012-07-08T08:58:33+00:00)? The docs say that it's because of some long running process. I've set config.assets.initialize_on_precompile = false in config/application.rb. EmBP-2:bc Emma$ heroku restart Restarting processes... done EmBP-2:bc Emma$ heroku logs --tail 2012-07-08T08:47:21+00:00 heroku[nginx]: 82.69.50.215 - - [08/Jul/2012:08:47:21 +0000] "GET /assets/application.js HTTP/1.1" 200 311723 "https://codicology.co.uk/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:47:21+00:00 heroku[nginx]: 127.0.0.1 - - [08/Jul/2012:08:47:21 +0000] "GET /assets/application.js HTTP/1.0" 200 1311615 "https://codicology.co.uk/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:51:32+00:00 heroku[slugc]: Slug compilation started 2012-07-08T08:54:05+00:00 heroku[api]: Release v145 created by [email protected] 2012-07-08T08:54:05+00:00 heroku[api]: Deploy 8814b2f by [email protected] 2012-07-08T08:54:05+00:00 heroku[web.1]: State changed from up to starting 2012-07-08T08:54:06+00:00 heroku[slugc]: Slug compilation finished 2012-07-08T08:54:09+00:00 heroku[web.1]: Stopping all processes with SIGTERM 2012-07-08T08:54:09+00:00 heroku[worker.1]: Stopping all processes with SIGTERM 2012-07-08T08:54:09+00:00 heroku[web.1]: Starting process with command `bundle exec unicorn -p 22429 -c ./config/unicorn.rb` 2012-07-08T08:54:10+00:00 app[worker.1]: [Worker(host:2046e0bf-e109-40f2-abdb-10f69d224483 pid:1)] Exiting... 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.320616 #1] INFO -- : reaped #<Process::Status: pid 8 exit 0> worker=1 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.376765 #1] INFO -- : master complete 2012-07-08T08:54:11+00:00 app[web.1]: I, [2012-07-08T08:54:11.376272 #1] INFO -- : reaped #<Process::Status: pid 5 exit 0> worker=0 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.011695 #1] INFO -- : worker=0 spawning... 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.011386 #1] INFO -- : listening on addr=0.0.0.0:22429 fd=3 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.017917 #5] INFO -- : worker=0 spawned pid=5 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.019309 #1] INFO -- : master process ready 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.018250 #5] INFO -- : Refreshing Gem list 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.016768 #1] INFO -- : worker=1 spawning... 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.020863 #8] INFO -- : Refreshing Gem list 2012-07-08T08:54:12+00:00 app[web.1]: I, [2012-07-08T08:54:12.020617 #8] INFO -- : worker=1 spawned pid=8 2012-07-08T08:54:12+00:00 app[worker.1]: SQL (2.9ms) UPDATE "delayed_jobs" SET locked_by = null, locked_at = null WHERE (locked_by = 'host:2046e0bf-e109-40f2-abdb-10f69d224483 pid:1') 2012-07-08T08:54:12+00:00 heroku[web.1]: Process exited with status 0 2012-07-08T08:54:13+00:00 heroku[web.1]: State changed from starting to up 2012-07-08T08:54:14+00:00 heroku[worker.1]: Process exited with status 0 2012-07-08T08:54:14+00:00 heroku[worker.1]: State changed from up to down 2012-07-08T08:54:14+00:00 heroku[worker.1]: State changed from down to starting 2012-07-08T08:54:20+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work` 2012-07-08T08:54:20+00:00 heroku[worker.1]: State changed from starting to up 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:28+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:54:33+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:54:33+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:54:33+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:33+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:54:34+00:00 app[web.1]: 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:34+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:54:41+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:54:41+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:54:45+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:54:46+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:54:47+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:54:48+00:00 app[web.1]: I, [2012-07-08T08:54:48.467693 #8] INFO -- : worker=1 ready 2012-07-08T08:54:48+00:00 app[web.1]: I, [2012-07-08T08:54:48.823800 #5] INFO -- : worker=0 ready 2012-07-08T08:54:48+00:00 app[worker.1]: Starting the New Relic Agent. 2012-07-08T08:54:48+00:00 app[worker.1]: New Relic Agent not running. 2012-07-08T08:54:48+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] New Relic Ruby Agent Monitoring DJ worker host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1 2012-07-08T08:54:48+00:00 app[worker.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:54:49+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] Starting job worker 2012-07-08T08:57:54+00:00 heroku[web.1]: State changed from up to starting 2012-07-08T08:57:56+00:00 heroku[web.1]: Stopping all processes with SIGTERM 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047386 #1] INFO -- : reaped #<Process::Status: pid 5 exit 0> worker=0 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047753 #1] INFO -- : reaped #<Process::Status: pid 8 exit 0> worker=1 2012-07-08T08:57:57+00:00 app[web.1]: I, [2012-07-08T08:57:57.047999 #1] INFO -- : master complete 2012-07-08T08:57:57+00:00 heroku[worker.1]: Stopping all processes with SIGTERM 2012-07-08T08:57:58+00:00 heroku[web.1]: Process exited with status 0 2012-07-08T08:57:58+00:00 app[worker.1]: [Worker(host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1)] Exiting... 2012-07-08T08:57:59+00:00 heroku[web.1]: Starting process with command `bundle exec unicorn -p 29766 -c ./config/unicorn.rb` 2012-07-08T08:58:01+00:00 app[worker.1]: SQL (27.9ms) UPDATE "delayed_jobs" SET locked_by = null, locked_at = null WHERE (locked_by = 'host:1eabe514-7ec9-43b0-835b-ff3bd23bc266 pid:1') 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.070527 #1] INFO -- : listening on addr=0.0.0.0:29766 fd=3 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.070782 #1] INFO -- : worker=0 spawning... 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.074498 #1] INFO -- : worker=1 spawning... 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.075702 #1] INFO -- : master process ready 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.076732 #5] INFO -- : worker=0 spawned pid=5 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.076957 #5] INFO -- : Refreshing Gem list 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.089022 #8] INFO -- : worker=1 spawned pid=8 2012-07-08T08:58:02+00:00 app[web.1]: I, [2012-07-08T08:58:02.089299 #8] INFO -- : Refreshing Gem list 2012-07-08T08:58:02+00:00 heroku[worker.1]: Process exited with status 0 2012-07-08T08:58:02+00:00 heroku[worker.1]: State changed from up to down 2012-07-08T08:58:02+00:00 heroku[worker.1]: State changed from down to starting 2012-07-08T08:58:02+00:00 heroku[web.1]: State changed from starting to up 2012-07-08T08:58:10+00:00 heroku[worker.1]: Starting process with command `bundle exec rake jobs:work` 2012-07-08T08:58:11+00:00 heroku[worker.1]: State changed from starting to up 2012-07-08T08:58:28+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:58:28+00:00 app[worker.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/Rakefile:10) 2012-07-08T08:58:33+00:00 heroku[router]: Error H12 (Request timeout) -> GET codicology.co.uk/ dyno=web.1 queue= wait= service=30000ms status=503 bytes=0 2012-07-08T08:58:33+00:00 heroku[nginx]: 127.0.0.1 - - [08/Jul/2012:08:58:33 +0000] "GET / HTTP/1.0" 503 601 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:58:33+00:00 heroku[nginx]: 82.69.50.215 - - [08/Jul/2012:08:58:33 +0000] "GET / HTTP/1.1" 503 601 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.52.7 (KHTML, like Gecko) Version/5.1.2 Safari/534.52.7" codicology.co.uk 2012-07-08T08:58:42+00:00 app[worker.1]: New Relic Agent not running. 2012-07-08T08:58:42+00:00 app[worker.1]: [Worker(host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1)] New Relic Ruby Agent Monitoring DJ worker host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1 2012-07-08T08:58:42+00:00 app[worker.1]: Starting the New Relic Agent. 2012-07-08T08:58:42+00:00 app[worker.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:58:43+00:00 app[worker.1]: [Worker(host:b5fa9243-6f9b-4de4-8f64-adab767fe4b0 pid:1)] Starting job worker 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:58:56+00:00 app[web.1]: DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released. (called from <top (required)> at /app/config/environment.rb:6) 2012-07-08T08:59:02+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:59:02+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:59:02+00:00 app[web.1]: Starting the New Relic Agent. 2012-07-08T08:59:02+00:00 app[web.1]: Installed New Relic Browser Monitoring middleware 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:03+00:00 app[web.1]: [DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it. 2012-07-08T08:59:03+00:00 app[web.1]: 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant XLSX 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:04+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/http/mime_type.rb:102: warning: already initialized constant PDF 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:59:22+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importadvancecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpaymentcsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importpurchasecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Importsalecsv class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for csv with :s3_eu_url. This will clash with attachment defined in Profitarchive class 2012-07-08T08:59:23+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:59:24+00:00 app[web.1]: [paperclip] Duplicate URL for xml with :s3_eu_url. This will clash with attachment defined in Onixarchive class 2012-07-08T08:59:25+00:00 app[web.1]: I, [2012-07-08T08:59:25.555052 #5] INFO -- : worker=0 ready 2012-07-08T08:59:25+00:00 app[web.1]: 2012-07-08T08:59:25+00:00 app[web.1]: 2012-07-08T08:59:25+00:00 app[web.1]: Started GET "/" for 82.69.50.215 at 2012-07-08 08:59:25 +0000 2012-07-08T08:59:26+00:00 app[web.1]: Processing by PagesController#home as HTML 2012-07-08T08:59:26+00:00 app[web.1]: I, [2012-07-08T08:59:26.043501 #8] INFO -- : worker=1 ready 2012-07-08T08:59:26+00:00 app[web.1]: Rendered pages/home.html.haml within layouts/application (5.7ms) 2012-07-08T08:59:26+00:00 app[web.1]: (1.1ms) SELECT COUNT(*) FROM "delayed_jobs" 2012-07-08T08:59:26+00:00 app[web.1]: Rendered layouts/_header.html.erb (4.2ms) 2012-07-08T08:59:26+00:00 app[web.1]: Rendered layouts/_footer.html.haml (1.4ms) 2012-07-08T08:59:26+00:00 app[web.1]: Completed 200 OK in 326ms (Views: 258.4ms | ActiveRecord: 65.2ms)

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  • nested attributes with polymorphic has_one model

    - by Millisami
    I am using accepts_nested_attributes_for with the has_one polymorphic model in rails 2.3.5 Following are the models and its associations: class Address < ActiveRecord::Base attr_accessible :city, :address1, :address2 belongs_to :addressable, :polymorphic => true validates_presence_of :address1, :address2, :city end class Vendor < ActiveRecord::Base attr_accessible :name, :address_attributes has_one :address, :as => :addressable, :dependent => :destroy accepts_nested_attributes_for :address end This is the view: - form_for @vendor do |f| = f.error_messages %p = f.label :name %br = f.text_field :name - f.fields_for :address_attributes do |address| = render "shared/address_fields", :f => address %p = f.submit "Create" This is the partial shared/address_fields.html.haml %p = f.label :city %br= f.text_field :city %span City/Town name like Dharan, Butwal, Kathmandu, .. %p = f.label :address1 %br= f.text_field :address1 %span City Street name like Lazimpat, New Road, .. %p = f.label :address2 %br= f.text_field :address2 %span Tole, Marg, Chowk name like Pokhrel Tole, Shanti Marg, Pako, .. And this is the controller: class VendorsController < ApplicationController def new @vendor = Vendor.new end def create @vendor = Vendor.new(params[:vendor]) if @vendor.save flash[:notice] = "Vendor created successfully!" redirect_to @vendor else render :action => 'new' end end end The problem is when I fill in all the fileds, the record gets save on both tables as expected. But when I just the name and city or address1 filed, the validation works, error message shown, but the value I put in the city or address1, is not persisted or not displayed inside the address form fields? This is the same case with edit action too. Though the record is saved, the address doesn't show up on the edit form. Only the name of the Client model is shown. Actually, when I look at the log, the address model SQL is not queried even at all.

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  • Java Memory Model: reordering and concurrent locks

    - by Steffen Heil
    Hi The java meomry model mandates that synchronize blocks that synchronize on the same monitor enforce a before-after-realtion on the variables modified within those blocks. Example: // in thread A synchronized( lock ) { x = true; } // in thread B synchronized( lock ) { System.out.println( x ); } In this case it is garanteed that thread B will see x==true as long as thread A already passed that synchronized-block. Now I am in the process to rewrite lots of code to use the more flexible (and said to be faster) locks in java.util.concurrent, especially the ReentrantReadWriteLock. So the example looks like this: // in thread A synchronized( lock ) { lock.writeLock().lock(); x = true; lock.writeLock().unlock(); } // in thread B synchronized( lock ) { lock.readLock().lock(); System.out.println( x ); lock.readLock().unlock(); } However, I have not seen any hints within the memory model specification that such locks also imply the nessessary ordering. Looking into the implementation it seems to rely on the access to volatile variables inside AbstractQueuedSynchronizer (for the sun implementation at least). However this is not part of any specification and moreover access to non-volatile variables is not really condsidered covered by the memory barrier given by these variables, is it? So, here are my questions: Is it safe to assume the same ordering as with the "old" synchronized blocks? Is this documented somewhere? Is accessing any volatile variable a memory barrier for any other variable? Regards, Steffen

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  • Is lock returned by ReentrantReadWriteLock equivalent to it's read and write locks?

    - by Todd
    Hello, I have been looking around for the answer to this, but no joy. In Java, is using the lock created by ReentrantReadWriteLock equivalent to getting the read and write locks as returned by readLock.lock() and writeLock.lock()? In other words, can I expect the read and write locks associated with the ReentrantReadWriteLock to be requested and held by synchronizing on the ReentrantReadWriteLock? My gut says "no" since any object can be used for synchronization. I wouldn't think that there would be special behavior for ReentrantReadWriteLock. However, special behavior is the corner case of which I may not be aware. Thanks, Todd

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  • Why are my files in /var/lock and where did they just go?!

    - by Nicky Hajal
    I am hosting a website on Debian 5.0 & Apache2. Today one of my websites was down, Apache said it couldn't find the directory. I located the files and the whole site once in /var/www/site was now /var/lock/site. All the files were present. I was confused, but figured I'd just move it back. mv /var/lock/site /var/www All looked fine... Except that only the directories moved and the files appear to be lost! I am working on restoring from backups but I would really love to know what happened and where my files went (the backups are a few days old). Thanks for your help!

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  • is it possible to lock oracle 10g database table with ADO.NET?

    - by matti
    I have a table that contains a maximum value that needs to be get and set by multiple programs. How can I lock the table for a while when old value is got and new is updated in C#? In other words: string sql = "lock table MaxValueTable in exclusive mode"; using (DbCommand cmd = cnctn.CreateCommand()) { cmd.CommandText = sql; // execute command somehow!! } maxValue = GetMaxValue(); SetMaxValue(maxValue + X); sql = "lock table MaxValueTable in share mode"; using (DbCommand cmd = cnctn.CreateCommand()) { cmd.CommandText = sql; // execute command somehow!! }

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  • Template type deduction with a non-copyable class

    - by Evan Teran
    Suppose I have an autolocker class which looks something like this: template <T> class autolocker { public: autolocker(T *l) : lock(l) { lock->lock(); } ~autolocker() { lock->unlock(); } private: autolocker(const autolocker&); autolocker& operator=(const autolocker&); private: T *lock; } Obviously the goal is to be able to use this autolocker with anything that has a lock/unlock method without resorting to virtual functions. Currently, it's simple enough to use like this: autolocker<some_lock_t> lock(&my_lock); // my_lock is of type "some_lock_t" but it is illegal to do: autolocker lock(&my_lock); // this would be ideal Is there anyway to get template type deduction to play nice with this (keep in my autolocker is non-copyable). Or is it just easiest to just specify the type?

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