Pthread Error 22 Einval
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Pthread_mutex_lock Error 22
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Pthread_mutex_unlock
Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join pthread_mutex_init them; it only takes a minute: Sign up c++ correct use of mutex up vote 3 down vote favorite i have multithreaded project and i've run it through valgrind with --tool=helgrind and it showed me few errors. I'm using mutex there exaxtly how i found on the net how to use it, can you please show me whats wrong? pthread_mutex_initializer #include #include #define MAX_THREADS 100 #define MAX_SESSIONS 100 static pthread_mutex_t M_CREATE_SESSION_LOCK= PTHREAD_MUTEX_INITIALIZER; ..... void connection::proccess(threadVarsType &THREAD) { .... pthread_mutex_lock(&M_CREATE_SESSION_LOCK); unsigned int ii; for (ii=0; iihere for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings
Pthread Mutex Example
and policies of this site About Us Learn more about Stack std::mutex Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; http://stackoverflow.com/questions/5836538/c-correct-use-of-mutex it only takes a minute: Sign up pthread_setschedprio() fails with “EINVAL” up vote 1 down vote favorite I just started with pthreads and don't know much about it. I was trying to set the priorities of pthreads using pthread_setschedprio() but it returns "EINVAL". Here is my code: #include #include void *Run(void *ptr); class Thread { public: pthread_t myPthread; http://stackoverflow.com/questions/3140505/pthread-setschedprio-fails-with-einval void start() { pthread_create( &myPthread, NULL, Run, (void*)this ); } Thread() { } virtual void run() = 0; }; void *Run( void *ptr ) { Thread* tmp; tmp = (Thread*)ptr; tmp->run(); } class MyThread : public Thread { public: virtual void run() { while (1) { printf("Running\n"); sleep(1); } } }; MyThread t1; int main() { int status; t1.start(); status= pthread_setschedprio(t1.myPthread, 300); if(status!=0) { if(status==EPERM) { fprintf(stderr,"EPERM\n"); } else if(status==EINVAL) { fprintf(stderr,"EINVAL\n"); } else { fprintf(stderr,"neither EPERM nor EINVAL\n"); } fprintf(stderr,"error %d\n",status); errno=status; perror(""); exit(1); } pthread_join( t1.myPthread, NULL); exit(0); } When I try to compile it, I get EINVAL Running error 22 Invalid argument Can anybody tell me why I get the error and how I can solve it? c++ pthreads share|improve this question edited Jun 29 '10 at 12:25 just somebody 12.1k13550 asked Jun 29 '10 at 12:17 sleep 6634 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote From this link it looks like it means the priority you specified is invalid for the current scheduling policy. If you
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 https://github.com/rust-lang/rust/issues/20698 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 error 22 with most recent rust (and all versions since the removal of rustrt), it fails with: hello thread '' panicked at 'assertion failed: `(left == right) && (right == left)` (left: `22`, right: `0`)', /home/..../rust/src/libstd/sys/unix/mutex.rs:53 The code that fails is: let r = ffi::pthread_mutex_destory(self.inner.get()); debug_assert_eq!(r, 0); It returns with error code 22 (EINVAL) instead of 0. To me it seems that Mutex::destroy() is called pthread error 22 twice! It might be related to the new TLS thread_local code and destructor support, but it's pretty hard to understand, so any ideas how to track the bug further down and fix it is welcomed. sfackler added the I-wrong label Jan 7, 2015 The Rust Programming Language member alexcrichton commented Jan 7, 2015 Can you get a backtrace at what's failing as well? I would be quite surprised if we destroyed a mutex twice, because that's certainly very bad! Can you also make sure that this passes successfully for you? #include #include int main() { pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; assert(pthread_mutex_destroy(&lock) == 0); } mneumann commented Jan 8, 2015 It fails with error code 22, if I compile it like cc -pthread test.c. If I compile it without -pthread it works. I noticed that in general pthread functions (e.g. pthread_key_create) only work within a pthread-created thread, not in the main thread. I'll send this to the DragonFly specific mailing list for additional help. The backtrace of the example program I gave above is: thread '' panicked at 'assertion failed: `(left == right) && (right == left)` (left: