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Pthread_mutex_lock Error Code 22

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a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up pthread_mutex_lock returns 22 in C [duplicate] up vote 1 down vote favorite This question already has an answer here: pthread_mutex_lock returns invalid argument 2 answers I'm learning how to use Pthread pthread_mutex_unlock in C. I've tried to use pthread_mutex_lock. It is supposed to return 0 when the locking is successful. But my program always returns 22 - invalid argument. The code is as follow: pthread_mutex_lock is used in work_function #include #include #include #include #define N 2 void *work_function(void *param); int count=0; pthread_mutex_t mut; int main(int args, char **argv) { pthread_t tid[N]; long int iterations = atoi(argv[1]); pthread_create(&tid[0], NULL, work_function, (void *) iterations); pthread_create(&tid[1], NULL, work_function, (void *) iterations); pthread_join(tid[1], NULL); pthread_join(tid[0], NULL); if (count != iterations * 2) printf("Error: %d\n",count); else printf("Value as expected: count = %d\n", count); pthread_exit(NULL); } void *work_function(void *param) { long int max_iter = (long int) param; int i, tmp; pid_t pid = getpid(); pthread_t id = pthread_self(); i = pthread_mutex_lock(&mut); printf("%d\n", i); for(i = 0; i < max_iter; i++) { tmp = count; tmp ++; printf("in thread: pid=%d and id=%u count=%d new\n", (unsigned int) pid, (unsigned int) id, c

Forum Visual C++ & C++ Programming C++ (Non Visual C++ Issues) pthread_mutex_lock fails If this is your first visit, be sure pthread_mutexattr_t to check out the FAQ by clicking the link above. You may pthread_mutex_destroy have to register or Login before you can post: click the register link above to proceed. To start viewing std::mutex messages, select the forum that you want to visit from the selection below. Results 1 to 6 of 6 Thread: pthread_mutex_lock fails Tweet Thread Tools Show Printable Version Email this http://stackoverflow.com/questions/30511046/pthread-mutex-lock-returns-22-in-c Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode February 18th, 2011,12:40 AM #1 srinivasant View Profile View Forum Posts Junior Member Join Date Jul 2007 Posts 15 pthread_mutex_lock fails Hi, I have linked statically libodbc++ (libodbc++-mt.a) with my CPP application and connect to MySQL from various threads simultaneously from my application. At some http://forums.codeguru.com/showthread.php?508898-pthread_mutex_lock-fails point my application crashes with the following error, terminate called after throwing an instance of 'odbc::SQLException' what(): [libodbc++]: OS error, mutex lock failed HY000 : [libodbc++]: OS error, mutex lock failed :: [Open DB] : IN DB /home/test/Users/Srini/xxxxxxx/dbnamexxx terminate called recursively HY000 : [libodbc++]: OS error, mutex lock failed :: [Open DB] : IN DB /home/test/Users/Srini/xxxxxxx/dbnamexxx terminate called recursively HY000 : [libodbc++]: OS error, mutex lock failed :: [Open DB] : IN DB /home/test/Users/Srini/xxxxxxx/dbnamexxx Aborted Seems the pthread_mutex_lock() in src/threads.cpp fails with error and libodbc throws exception and hence application crashes (running in my application in debug mode). I have checked the return value of pthread_mutex_lock() and it is EINVAL (22) which means Invalid Argument. The details of my setup is as follows, OS : Cent OS 5.3 libodbc++ : v0.2.3 unixODBC : v2.2.15pre MySQL Driver : v3.51.27 MySQL Server : v5.1.39 My odbcinst.ini file is as follows, -------------------8<---------------------- [ODBC] Trace = No Trace File = /tmp/sql.log Pooling = Yes [MySQL] Description = Driver = /usr/local/lib/libmyodbc3-3.51.27.so Driver64 = Setup = /usr/local/lib/libmyodbc3S-3.51.27.so Setup64 = UsageCount =1 CPTimeout =300 CPReuse =1 Threading =0 ------------------->8-------------

pthread_mutex_lock(pthread_mutex_t *mutex); int pthread_mutex_trylock(pthread_mutex_t *mutex); int pthread_mutex_unlock(pthread_mutex_t *mutex); DESCRIPTION The mutex object referenced by mutex is locked by calling pthread_mutex_lock(). If the mutex is already locked, the calling thread blocks until the mutex becomes available. This http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_mutex_lock.html operation returns with the mutex object referenced by mutex in the locked state with the calling thread as its owner. If the mutex type is PTHREAD_MUTEX_NORMAL, deadlock detection is not provided. https://github.com/rust-lang/rust/issues/20698 Attempting to relock the mutex causes deadlock. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, undefined behaviour results. If the pthread_mutex_lock error mutex type is PTHREAD_MUTEX_ERRORCHECK, then error checking is provided. If a thread attempts to relock a mutex that it has already locked, an error will be returned. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, an error will be returned. If the mutex type is PTHREAD_MUTEX_RECURSIVE, then the mutex maintains the concept pthread_mutex_lock error code of a lock count. When a thread successfully acquires a mutex for the first time, the lock count is set to one. Every time a thread relocks this mutex, the lock count is incremented by one. Each time the thread unlocks the mutex, the lock count is decremented by one. When the lock count reaches zero, the mutex becomes available for other threads to acquire. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, an error will be returned. If the mutex type is PTHREAD_MUTEX_DEFAULT, attempting to recursively lock the mutex results in undefined behaviour. Attempting to unlock the mutex if it was not locked by the calling thread results in undefined behaviour. Attempting to unlock the mutex if it is not locked results in undefined behaviour. The function pthread_mutex_trylock() is identical to pthread_mutex_lock() except that if the mutex object referenced by mutex is currently locked (by any thread, including the current thread), the call returns immediately. The pthread_mutex_unlock() function releases the mutex object referenced by mutex. The manner in which a mutex is released is de

Sign in Pricing Blog Support Search GitHub This repository Watch 1,051 Star 18,748 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 '

' 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 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); } m

 

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Pthread mutex lock Error Codes p pthread mutex lock pthread mutex t i mutex i int pthread mutex trylock pthread mutex t i mutex i int pthread mutex unlock pthread mutex t i mutex i DESCRIPTION The mutex object referenced by mutex is locked by calling pthread mutex lock If the mutex is already locked the calling thread blocks until the mutex becomes available Pthread mutex lock Example This operation returns with the mutex object referenced by mutex in the pthread mutex lock return value locked state with the calling thread as its owner If the mutex type is PTHREAD

pthread_mutex_lock error checking

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