Pthread_mutex_init Error 22

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Pthread_mutex_init Man

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Pthread_mutex_init Recursive

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 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 pthread_mutex_initializer example - 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, count); // sleep(1); count = tmp; printf("haha\n"); } pthread_mutex_unlock(&mut); pthread_exit(NULL); } The following result is produced when 3 is passed in as the command line argument. 22 22 in thread: pid=36767 and id=6819840 count=0 new in thread: pid=36767 and id=7356416 count=0 new haha haha in thread: pid=36767 a

const pthread_mutexattr_t *attr); int pthread_mutex_destroy(pthread_mutex_t *mutex); pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; DESCRIPTION The pthread_mutex_init() function initialises the mutex referenced by mutex with attributes specified

Pthread_mutexattr_t

by attr. If attr is NULL, the default mutex attributes are

Pthread_cond_init

used; the effect is the same as passing the address of a default mutex attributes pthread_mutex example object. Upon successful initialisation, the state of the mutex becomes initialised and unlocked. Attempting to initialise an already initialised mutex results in undefined behaviour. The pthread_mutex_destroy() http://stackoverflow.com/questions/30511046/pthread-mutex-lock-returns-22-in-c function destroys the mutex object referenced by mutex; the mutex object becomes, in effect, uninitialised. An implementation may cause pthread_mutex_destroy() to set the object referenced by mutex to an invalid value. A destroyed mutex object can be re-initialised using pthread_mutex_init(); the results of otherwise referencing the object after it has been http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_mutex_init.html destroyed are undefined. It is safe to destroy an initialised mutex that is unlocked. Attempting to destroy a locked mutex results in undefined behaviour. In cases where default mutex attributes are appropriate, the macro PTHREAD_MUTEX_INITIALIZER can be used to initialise mutexes that are statically allocated. The effect is equivalent to dynamic initialisation by a call to pthread_mutex_init() with parameter attr specified as NULL, except that no error checks are performed. RETURN VALUE If successful, the pthread_mutex_init() and pthread_mutex_destroy() functions return zero. Otherwise, an error number is returned to indicate the error. The [EBUSY] and [EINVAL] error checks, if implemented, act as if they were performed immediately at the beginning of processing for the function and cause an error return prior to modifying the state of the mutex specified by mutex. ERRORS The pthread_mutex_init() function will fail if: [EAGAIN] The system lacked the necessary resources (other than memory) to initialise another mutex. [ENOMEM] Insufficient

Init Error 22 - Free Download 5942 downloads @ 2361 KB/s [Verified] Pthread Mutex Init Error 22 3452 downloads @ 3720 KB/s 3.8 Semaphores and Locks in Pthreads PTHREAD_MUTEX_INITIALIZER http://docs.askiver.com/pthread-mutex-init-error-22.html macro instead of calling pthread_mutex_int(). ... status = pthread_mutex_init(&mutex,&mutexAttribute ... // error code pthread_attr_t ... Practical Guide To Pthread Programming in C++ Practical Guide To Pthread Programming in C++ By Swaminathan Bhaskar 10/22/2008 https://linux.die.net/man/3/pthread_mutex_destroy Terminology: * Process: ... int pthread_mutex_init ... 6.087 Practical Programming in C, Lecture 12 -... ... ( "ERROR; return code from pthread_create is %d\n " , rc ); ... int pthread_mutex_init ( pthread_mutex_t pthread_mutex_init error ∗ mutex , ... 22 . Condition variables ... POSIX Threads - C programming PTHREAD_ONCE_INIT and the function pthread_once. ... a process when one of the threads receives a signal. • Most pthread functions, ... pthread_mutex_lock) ... Chapter 4 Shared Memory Programming with Pthreads –An error check mutex reports an error when a thread with a lock ... pthread_mutex_init (&task_queue_lock ... • If no threads are waiting pthread_mutex_init error 22 on the condition ... POSIX Thread Programming - Binghamton University pthread_mutex_init(pthread_mutex_t *, ... POSIX Thread programming – p.22/40. ... Explicitly unlock mutex Continue POSIX Thread programming ... POSIX THREADS (PTHREADS Make sure you compile your... pthread_attr_init / pthread_attr_destroy : create/ destroy a “thread attribute” object ... ("ERROR; return code from pthread_create() is %d\n", rc); COMP 322: Principles of Parallel Programming... COMP 322: Principles of Parallel Programming ... 22 COMP 322, Fall 2009 (V.Sarkar)! pthread_mutex_t task_queue_lock; ! ... pthread_mutex_init ... P-threads: create - University of California, San... ... attempt to lock a mutex, returns with a busy error code if the lock is currently locked. ... pthread_mutex_init(&zlock, NULL); ... 22 Pthreads: Semaphore ... ISO/IEC JTC 1/SC 22/WG 9 N0477r Initial Work Scope... ISO/IEC JTC 1/SC 22/WG 9 N0477r ... Ada POSIX Bindings Analysis pthread_condattr_destroy ... pthread_mutex_init pthread_mutex_setprioceiling Using the POSIX API - Free Electrons Using the POSIX API ... The second argument to pthread_mutex_init() is a set of ... « Error checking » mutex : ... CS 5523 Operating Systems: Thread and... CS 5523 Operating Systems: Thread and Implementation ... 22 Pthreads: Thread ... pthread_mutex_init Create a new mutex Programming with Threads in Unix - UNI Klagenfurt... Programming with

the interface may not be implemented on Linux. Name pthread_mutex_destroy, pthread_mutex_init - destroy and initialize a mutex Synopsis #include int pthread_mutex_destroy(pthread_mutex_t *mutex); int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr); pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; Description The pthread_mutex_destroy() function shall destroy the mutex object referenced by mutex; the mutex object becomes, in effect, uninitialized. An implementation may cause pthread_mutex_destroy() to set the object referenced by mutex to an invalid value. A destroyed mutex object can be reinitialized using pthread_mutex_init(); the results of otherwise referencing the object after it has been destroyed are undefined. It shall be safe to destroy an initialized mutex that is unlocked. Attempting to destroy a locked mutex results in undefined behavior. The pthread_mutex_init() function shall initialize the mutex referenced by mutex with attributes specified by attr. If attr is NULL, the default mutex attributes are used; the effect shall be the same as passing the address of a default mutex attributes object. Upon successful initialization, the state of the mutex becomes initialized and unlocked. Only mutex itself may be used for performing synchronization. The result of referring to copies of mutex in calls to pthread_mutex_lock(), pthread_mutex_trylock(), pthread_mutex_unlock(), and pthread_mutex_destroy() is undefined. Attempting to initialize an already initialized mutex results in undefined behavior. In cases where default mutex attributes are appropriate, the macro PTHREAD_MUTEX_INITIALIZER can be used to initialize mutexes that are statically allocated. The effect shall be equivalent to dynamic initialization by a call to pthread_mutex_init() with parameter attr specified