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  • stm monad problem

    - by Alex
    This is just a hypothetical scenario to illustrate my question. Suppose that there are two threads and one TVar shared between them. In one thread there is an atomically block that reads the TVar and takes 10s to complete. In another thread is an atomically block that modifies the TVar every second. Will the first atomically block ever complete? Surely it will just keep going back to the beginning, because the log is in an inconsistent state?

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  • AudioTrack lag: obtainBuffer timed out

    - by BTR
    I'm playing WAVs on my Android phone by loading the file and feeding the bytes into AudioTrack.write() via the FileInputStream BufferedInputStream DataInputStream method. The audio plays fine and when it is, I can easily adjust sample rate, volume, etc on the fly with nice performance. However, it's taking about two full seconds for a track to start playing. I know AudioTrack has an inescapable delay, but this is ridiculous. Every time I play a track, I get this: 03-13 14:55:57.100: WARN/AudioTrack(3454): obtainBuffer timed out (is the CPU pegged?) 0x2e9348 user=00000960, server=00000000 03-13 14:55:57.340: WARN/AudioFlinger(72): write blocked for 233 msecs, 9 delayed writes, thread 0xba28 I've noticed that the delayed write count increases by one every time I play a track -- even across multiple sessions -- from the time the phone has been turned on. The block time is always 230 - 240ms, which makes sense considering a minimum buffer size of 9600 on this device (9600 / 44100). I've seen this message in countless searches on the Internet, but it usually seems to be related to not playing audio at all or skipping audio. In my case, it's just a delayed start. I'm running all my code in a high priority thread. Here's a truncated-yet-functional version of what I'm doing. This is the thread callback in my playback class. Again, this works (only playing 16-bit, 44.1kHz, stereo files right now), it just takes forever to start and has that obtainBuffer/delayed write message every time. public void run() { // Load file FileInputStream mFileInputStream; try { // mFile is instance of custom file class -- this is correct, // so don't sweat this line mFileInputStream = new FileInputStream(mFile.path()); } catch (FileNotFoundException e) {} BufferedInputStream mBufferedInputStream = new BufferedInputStream(mFileInputStream, mBufferLength); DataInputStream mDataInputStream = new DataInputStream(mBufferedInputStream); // Skip header try { if (mDataInputStream.available() > 44) mDataInputStream.skipBytes(44); } catch (IOException e) {} // Initialize device mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, ConfigManager.SAMPLE_RATE, AudioFormat.CHANNEL_CONFIGURATION_STEREO, AudioFormat.ENCODING_PCM_16BIT, ConfigManager.AUDIO_BUFFER_LENGTH, AudioTrack.MODE_STREAM); mAudioTrack.play(); // Initialize buffer byte[] mByteArray = new byte[mBufferLength]; int mBytesToWrite = 0; int mBytesWritten = 0; // Loop to keep thread running while (mRun) { // This flag is turned on when the user presses "play" while (mPlaying) { try { // Check if data is available if (mDataInputStream.available() > 0) { // Read data from file and write to audio device mBytesToWrite = mDataInputStream.read(mByteArray, 0, mBufferLength); mBytesWritten += mAudioTrack.write(mByteArray, 0, mBytesToWrite); } } catch (IOException e) { } } } } If I can get past the artificially long lag, I can easily deal with the inherit latency by starting my write at a later, predictable position (ie, skip past the minimum buffer length when I start playing a file).

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  • What is Apache process model?

    - by Morgan Cheng
    I have been googling this question for some time but got no answers. What's the Apache process model? By process model, I mean how Apache manage process or thread to handling HTTP request. Does it fork one process for each HTTP request? Does it have process/thread pool? Can we config it? Is there any online doc for such Apache details?

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  • Simple line matching using Regex

    - by Joan Venge
    I have this string stream: "do=whoposted&amp;t=1934067" rel=nofollow>61</A></TD><TD class=alt2 align=middle>5,286</TD></TR><TR><TD id=td_threadstatusicon_1911046 class=alt1><IMG id=thread_statusicon_1911046 border=0 alt="" src="http://url.com/forum/images/statusicon/thread_new.gif"> </TD><TD class=alt2><IMG title=Node border=0 alt=Node src="http://url.com/forum/images/icons/new.png"></TD><TD id=td_threadtitle_1911046 class=alt1 title="http://lulzimg.com/i14/7bd11b.jpg &#10; &#10;Complete name : cool-thread...."><DIV><A id=thread_gotonew_1911046 href="http://url.com/forum/f80/cool-topic-new/"><IMG class=inlineimg title="Go to first new post" border=0 alt="Go to first new post" src="http://url.com/forum/images/buttons/firstnew.gif"></A> [MULTI] <A style="FONT-WEIGHT: bold" id=thread_title_1911046 href="http://url.com/forum/f80/cool-topic-name-1911046/">Cool Topic Name</A> </DIV><DIV class=smallfont><SPAN style="CURSOR: pointer" onclick="window.open('http://url.com/forum/members/u2031889/', '_self')">m3no</SPAN> </DIV></TD><TD class=alt2 title="Replies: 11, Views: 1,554"><DIV style="TEXT-ALIGN: right; WHITE-SPACE: nowrap" class=smallfont>Today <SPAN class=time>08:04 AM</SPAN><BR>by <A href="http://url.com/forum/members/u1131830/" rel=nofollow>karetsos</A> <A " The lines I am interested are similar to this: <A style="FONT-WEIGHT: bold" id=thread_title_1911046 href="http://url.com/forum/f80/cool-topic-name-1911046/">Cool Topic Name</A> From here all I am trying to extract are: Thread id: 1911046 (could be from either location in the string) Thread name: "Cool Topic Name" Thread link: "http://url.com/forum/f80/cool-topic-name-1911046/" Currently I use this: Regex pattern = new Regex ( "<A\\s+href=\"([^\"]*)\">([^\\x00]*?)\\s+id=thread_title_(\\S+)</A>" ); MatchCollection matches = pattern.Matches ( doc.ToString ( ) ); foreach ( Match match in matches ) { int id = Convert.ToInt32 ( match.Groups [ 1 ].Value ); string name = match.Groups [ 3 ].Value; string link = match.Groups [ 2 ].Value; ... } I would appreciate if someone can help me fix the pattern to match it. This used to work but it returns 0 matches.

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  • SerialPort.Write() - How to stop writing?

    - by DaniMelo
    Hello, I am developing in C# using the SerialPort class. SerialPort.Write() is a blocking method. How can I exit this method when I want to stop writing? I use a thread to write. I abort this thread when I want to stop writing but the COM port continues to write. Any ideas? Thanks a lot. Sorry for my basic English.

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  • send socket c ctrl+c behavior

    - by out_sider
    I'm witting an application based on a server and various client but I'm having a problem with the send command. Whenever I do ctrl+c on the client side the send operation kills the thread which is in and the process running (in order to have multiple clients I set a thread to which one). If the client ends (doing the close socket) properly the server doesn't die, but when I use the ctrl+c combination on the client both exit. What can I do to prevent send commando to have this behavior? Thx in advance

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  • C# lines of Code

    - by matt
    What does this do exactly? var counts = new Dictionary<string, int>(); for (int i = 0; i < 10; i++) counts[string.Format("STA Thread Queue Worker Thread No. {0}", i + 1)] = 0; Thanks

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  • Better alternative for PipedReader/PipedWriter?

    - by Esko Luontola
    I need to have a buffered char stream, into which I write in one thread and from which I read in another thread. Right now I'm using PipedReader and PipedWriter for it, but those classes cause a performance problem: PipedReader does a wait(1000) when its internal buffer is empty, which causes my application to lag visibly. Would there be some library which does the same thing as PipedReader/PipedWriter, but with better performance? Or will I have to implement my own wheels?

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  • How expensive is synchronization?

    - by someguy
    I am writing a networking application using the java.nio api. My plan is to perform I/O on one thread, and handle events on another. To do this though, I need to synchronize reading/writing so that a race condition is never met. Bearing in mind that I need to handle thousands of connections concurrently, is synchronization worth it, or should I use a single thread for I/O and event handling?

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  • C threads question

    - by Nadeem
    Write program that has two threads one is reading numbers from the user and the other is printing them such that the first thread reads a new number only after it has been printed by the second thread. Declare one global varaible to use for reading and printing.

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  • What to do if one library is not multi-threaded ?

    - by LB
    Hi, I would like to multi-thread an application, however one library i'm using is not multi-thread capable (i don't know what's the right word ? synchronized ?). What are my options ? As far as i know there's nothing in between threads and processes (Runtime.exec) in java (no abstraction in the jvm to have something like an isolated "java process"). How would you deal with that ?

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  • Editline with non-blocking input.

    - by Sasun Hambardzumyan
    I use editline library in my program, for user commands input in shell. But becides shell, program have a gui interface, so I need to run editline's readline() function in separate thread, because it blocks until Enter pressed. Is there a way to use readline() function without blocking, so I could avoid separate thread usage?

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  • Is it multitasking?(c#3.0)

    - by Newbie
    Consider the below program factorThread = new Thread( new ThreadStart( delegate { Method1(); Method2(); } ) ); Is it that 2 threads are getting called parallely(multitasking) or a single thread is calling the methods sequentially? It's urgent. Thanks

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  • Order results by another table?

    - by user3462020
    I'm working on a custom forum system and I'm trying to figure out how to put a thread on the top of the list if a user posts in it. I've got this for my query SELECT user_threads.threadID, user_threads.title, user_threads.uid, user_threads.postDate, thread_messages.posted FROM user_threads, thread_messages WHERE parent = :parent GROUP BY user_threads.title ORDER BY thread_messages.posted DESC Which doesn't appear to be working. if I post in a new thread, it remains where it is on the list.

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  • What is JavaScript, really?

    - by Lord Loh.
    All this started when I was looking for a way to test my webpage for JavaScript conformance like the W3C HTML Validator. I have not found one yet. So let me know if you know of any... I looked for the official JavaScript page and find ECMA Script. These people have standardized a scripting language (I do not feel like calling it JavaScript anymore!) and called it ECMA-262 (Wikipedia). Their latest work is Edition 5.1 JavaScript was developed my Mozilla Corporation and their last stable version is 1.8.5 (see this) which is based on the ECMA's edition 5.1 The Wikipedia page linked mentions dialects. Mozilla's JavaScript 1.8.5 is listed as a dialect along with JScript 9 (IE) and JavaScript (Chrome's V8[Wiki]) and a lot others. Am I to understand that JavaScript 1.8.5 is a derivative of the ECMA-262 and SpiderMonkey[Wiki] is an engine that runs it? And Chrome has its own dialect and V8 engine is the program that runs it? With all these dialects based off ECMA-262, what I can no longer understand is "What is JavaScript"? Are there any truly cross browser scripting languages? Do the various implementers come together to agree on the dialect cross compatibility? Is this effort ECMA?

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  • SQL SERVER – Find Most Expensive Queries Using DMV

    - by pinaldave
    The title of this post is what I can express here for this quick blog post. I was asked in recent query tuning consultation project, if I can share my script which I use to figure out which is the most expensive queries are running on SQL Server. This script is very basic and very simple, there are many different versions are available online. This basic script does do the job which I expect to do – find out the most expensive queries on SQL Server Box. SELECT TOP 10 SUBSTRING(qt.TEXT, (qs.statement_start_offset/2)+1, ((CASE qs.statement_end_offset WHEN -1 THEN DATALENGTH(qt.TEXT) ELSE qs.statement_end_offset END - qs.statement_start_offset)/2)+1), qs.execution_count, qs.total_logical_reads, qs.last_logical_reads, qs.total_logical_writes, qs.last_logical_writes, qs.total_worker_time, qs.last_worker_time, qs.total_elapsed_time/1000000 total_elapsed_time_in_S, qs.last_elapsed_time/1000000 last_elapsed_time_in_S, qs.last_execution_time, qp.query_plan FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp ORDER BY qs.total_logical_reads DESC -- logical reads -- ORDER BY qs.total_logical_writes DESC -- logical writes -- ORDER BY qs.total_worker_time DESC -- CPU time You can change the ORDER BY clause to order this table with different parameters. I invite my reader to share their scripts. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQLAuthority News, SQLServer, T SQL, Technology Tagged: SQL DMV

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  • The “Customer” Experience Revolution is Here

    - by Jeri Kelley
    A guest post by Anthony Lye, SVP, CRM, Oracle The Experience Revolution is here, and we are going to explore and celebrate our new customer experience (CX) ventures and strategy in an extraordinary way. In true Oracle fashion, we are hosting an exceptional event, bringing together customer experience advocates, visionaries and practitioners to discover and define Oracle’s Customer Experience vision. At The Experience Revolution, Oracle President Mark Hurd will detail the vision of where customer experience is going and how Oracle will help you get there. He will introduce for the first time Oracle Customer Experience, a cross stack suite of customer experience products that enable organizations to: Engage customers with a consistent, connected and personalized brand experience across all channels and devices Deliver exceptional cross-channel order fulfillment and customer service through web, call centers and social networks Connect and analyze data from all interactions to better personalize experiences and identify hidden opportunities The Experience Revolution will also include an interactive gallery of customer experience interactions, featuring videos, touch screens and near field communication technology that will guide each attendee through an individualized event experience. We hope you will join us for an incredible evening on June 25, from 6:00 – 9:00 p.m. at Gotham Hall in New York City.  You can register for The Experience Revolution here. And if you haven’t already joined the conversation on Twitter, please do:  #OracleCX, #ExperienceRevolution

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  • The “Customer” Experience Revolution is Here

    - by Jeri Kelley
    A guest post by Anthony Lye, SVP, CRM, Oracle The Experience Revolution is here, and we are going to explore and celebrate our new customer experience (CX) ventures and strategy in an extraordinary way. In true Oracle fashion, we are hosting an exceptional event, bringing together customer experience advocates, visionaries and practitioners to discover and define Oracle’s Customer Experience vision. At The Experience Revolution, Oracle President Mark Hurd will detail the vision of where customer experience is going and how Oracle will help you get there. He will introduce for the first time Oracle Customer Experience, a cross stack suite of customer experience products that enable organizations to: Engage customers with a consistent, connected and personalized brand experience across all channels and devices Deliver exceptional cross-channel order fulfillment and customer service through web, call centers and social networks Connect and analyze data from all interactions to better personalize experiences and identify hidden opportunities The Experience Revolution will also include an interactive gallery of customer experience interactions, featuring videos, touch screens and near field communication technology that will guide each attendee through an individualized event experience. We hope you will join us for an incredible evening on June 25, from 6:00 – 9:00 p.m. at Gotham Hall in New York City.  You can register for The Experience Revolution here. And if you haven’t already joined the conversation on Twitter, please do:  #OracleCX, #ExperienceRevolution

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