Pthread Error Codes 22
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Sign up pthread_mutex_lock returns invalid argument up vote 4 down vote favorite I am working on some C code and am having a problem with locking a mutex. The code does a call to a function and this function locks a mutex to ensure a file pointer doesn't get overwritten, this works fine for several instances, probably about 10-20 separate calls of errno 22 the function being called, but on the next call, pthread_mutex_lock will return with a result of 22. I've then put this result into strerror(); and got back invalid argument. What does invalid argument means, thanks for any help you can provide. c debugging pthreads mutex share|improve this question edited Oct 8 '12 at 12:43 vy32 9,0311661128 asked Oct 8 '12 at 12:39 Boardy 9,90554168284 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted Sounds like you have a threading problem or a wild point somewhere else in your program. Try printing the value of the mutex pointer. Try having another thread that simply locks the mutex and then prints to a log file the time and that the lock was successful, then unlocks the mutex. I suspect the problem is not where you are looking. Also, as other have said here, your best bet is to create a very small test program that demonstrates the problem and post it here. Chances are you won't be able to get that small program to demonstrate the error. Then slowly ad
pthread_attr_t attr; pthread_attr_init( &attr ); // returns 0 pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ); // returns 0 #ifdef SCHED_RR // is defined! if ( options && (options->flags & RTAUDIO_SCHEDULE_REALTIME) ) { struct
Pthread_create Example
sched_param param; int priority = options->priority; int min = sched_get_priority_min( SCHED_RR ); int max = sched_get_priority_max( SCHED_RR ); if ( priority < min ) priority = min; else if ( priority > max ) priority = max; param.sched_priority = priority; pthread_attr_setschedparam( &attr, ¶m ); // returns 22... pthread_attr_setschedpolicy( &attr, SCHED_RR ); // returns 0 // http://stackoverflow.com/questions/12781944/pthread-mutex-lock-returns-invalid-argument test begin: int x = pthread_attr_getschedparam( &attr, ¶m ); int prio = param.sched_priority; printf("\nPriority : %d \n", priority); // // returns 49 printf("\ngetsched : %d \n", x); // // returns 0 printf("\nT-Priority : %d \n", prio); // // returns 0 // test end } else //... I put these lines (test begin to test end) http://www.cplusplus.com/forum/unices/79490/ to the code, to see, if thread priority is really working. In the application "priority" is set (here) to 49. This test shows, that it is not working (prio = 0). Is there a mistake in the API or is my test-code wrong? My second question: If I set process-priority (in the application), how does this value interact with thread priority? For all threads? Regards Thomas Last edited on Sep 19, 2012 at 7:43am UTC Sep 18, 2012 at 7:30pm UTC Cubbi (4009) You're not checking the return values of those pthread_attr functions. Check if they return errors. A typical cause of a failure would be not running this test as root or having a restrictive ulimit -r (even as root) Sep 19, 2012 at 7:03am UTC TJF (11) I've checked them now: pthread_attr_setschedparam( &attr, ¶m ); returns a non zero value (=22). ulimit -r is set to 99. The same as root or as user... I put all return values in my first
to the Single Unix Specification standard consisted to submit an example of use for pthread_sigmask()[1]. Since my proposal was going to be viewed by many Austin Group's contributors (some being "recognized UNIX authority"), I tried to make my example as http://www.domaigne.com/blog/computing/pthreads-errors-and-errno/ perfect as possible. In an academic fashion, I checked every function's return code for https://github.com/rust-lang/rust/issues/20698 possible errors. That's where I got it wrong for the Pthreads APIs. Oh well, they do not use errno… The Problem: Before the advent of Pthreads, POSIX functions used to return -1 on error, and set the corresponding error code in the global variable errno[2]. This mechanism has a few drawbacks even for single-threaded process: it is no such not simple to return -1 as valid value. a signal handler may change the errno value between the point a function set errno, and the point where you check the errno variable. Of course, a global errno doesn't work for multi-threaded processes. Indeed, a thread could execute a function that modifies errno just before you check the value in another thread. The (Pthreads) Solution: Since Pthreads, the errno variable is no such file thread-local. That is, every thread has its own "errno copy". If you (or a system function) set the errno variable in one thread, it won't affect the errno value in any other thread. This is shown in the example below. Download errno_01.c1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 /*------------------------------ errno_01.c -------------------------------* compile with: cc -pthread errno_01.c -o errno_01 Copyright Loic Domaigne. Licensed under the Apache License, Version 2.0. *--------------------------------------------------------------------------*/ #include
Sign in Pricing Blog Support Search GitHub This repository Watch 1,051 Star 18,747 Fork 3,606 rust-lang/rust Code Issues 2,787 Pull requests 124 Projects 0 Pulse Graphs New issue Panic: Duplicate mutex destroy on Thread.join (DragonFly) #20698 Closed mneumann opened this Issue Jan 7, 2015 · 5 comments Projects None yet Labels I-wrong Milestone No milestone Assignees No one assigned 3 participants mneumann commented Jan 7, 2015 The following program triggers this: use std::thread::Thread; fn main() { Thread::spawn(move || { println!("Hello"); }).join(); println!("After join"); } When compiled on DragonFly with most recent rust (and all versions since the removal of rustrt), it fails with: hello thread '