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Pthread_mutex_lock Error Codes

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.

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_MUTEX_NORMAL, deadlock detection is not

Man Pthread_mutex_lock

provided. 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. pthread_mutex_trylock If the 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 pthread_mutex_unlock maintains the concept 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

and unlock a mutex SYNOPSIS #include <pthread.h>

int 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

Pthread_mutex_init

by mutex shall be locked by a call to pthread_mutex_lock() pthread_mutex_initializer that returns zero or [EOWNERDEAD]. If the mutex is already locked by another thread, the calling thread

Pthread_mutex_recursive

shall block until the mutex becomes available. This operation shall return with the mutex object referenced by mutex in the locked state with the calling thread as http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_mutex_lock.html its owner. If a thread attempts to relock a mutex that it has already locked, pthread_mutex_lock() shall behave as described in the Relock column of the following table. If a thread attempts to unlock a mutex that it has not locked or a mutex which is unlocked, pthread_mutex_unlock() shall behave as described in the Unlock http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutex_lock.html When Not Owner column of the following table. Mutex Type Robustness Relock Unlock When Not Owner NORMAL non-robust deadlock undefined behavior NORMAL robust deadlock error returned ERRORCHECK either error returned error returned RECURSIVE either recursive error returned (see below) DEFAULT non-robust undefined undefined behavior behavior DEFAULT robust undefined error returned behavior If the mutex type is PTHREAD_MUTEX_DEFAULT, the behavior of pthread_mutex_lock() may correspond to one of the three other standard mutex types as described in the table above. If it does not correspond to one of those three, the behavior is undefined for the cases marked . Where the table indicates recursive behavior, the mutex shall maintain the concept of a lock count. When a thread successfully acquires a mutex for the first time, the lock count shall be set to one. Every time a thread relocks this mutex, the lock count shall be incremented by one. Each time the thread unlocks the

= PTHREAD_MUTEX_INITIALIZER; pthread_mutex_t recmutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; pthread_mutex_t errchkmutex = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP; int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr); int pthread_mutex_lock(pthread_mutex_t *mutex); int pthread_mutex_trylock(pthread_mutex_t *mutex); int pthread_mutex_unlock(pthread_mutex_t *mutex); int pthread_mutex_destroy(pthread_mutex_t *mutex); DESCRIPTION A mutex is a MUTual EXclusion device, and is useful for protecting shared data structures from concurrent modifications, and implementing critical sections and monitors. A mutex has two possible states: unlocked (not owned by any thread), and locked (owned by one thread). A mutex can never be owned by two different threads simultaneously. A thread attempting to lock a mutex that is already locked by another thread is suspended until the owning thread unlocks the mutex first. pthread_mutex_init initializes the mutex object pointed to by mutex according to the mutex attributes specified in mutexattr. If mutexattr is NULL, default attributes are used instead. The LinuxThreads implementation supports only one mutex attributes, the mutex kind, which is either ``fast'', ``recursive'', or ``error checking''. The kind of a mutex determines whether it can be locked again by a thread that already owns it. The default kind is ``fast''. See pthread_mutexattr_init(3) for more information on mutex attributes. Variables of type pthread_mutex_t can also be initialized statically, using the constants PTHREAD_MUTEX_INITIALIZER (for fast mutexes), PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP (for recursive mutexes), and PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP (for error checking mutexes). pthread_mutex_lock locks the given mutex. If the mutex is currently unlocked, it becomes locked and owned by the calling thread, and pthread_mutex_lock returns immediately. If the mutex is already locked by another thread, pthread_mutex_lock suspends the calling thread until the mutex is unlocked. If the mutex is already locked by the calling thread, the behavior of pthread_mutex_lock

 

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pthread_mutex_lock error numbers

Pthread mutex lock Error Numbers p - lock and unlock a mutex SYNOPSIS tt sup a href javascript open code 'THR' THR a sup img src images opt-start gif alt Option Start border include a href basedefs pthread h html pthread h a br br int pthread mutex lock pthread mutex t tt i mutex i tt br int pthread mutex trylock pthread mutex t tt i mutex i tt br int pthread mutex unlock pthread mutex t tt i mutex i tt img src images opt-end gif Pthread mutex lock Example alt Option End border tt DESCRIPTION The mutex

pthread_mutex_lock error handling

Pthread mutex lock Error Handling 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 Pthread mutex lock Example becomes available This operation returns with the mutex object referenced by mutex pthread mutex lock return value in the locked state with the calling thread as its owner If the mutex type is PTHREAD

pthread_mutex_lock error 35

Pthread mutex lock Error p p p p p p p p

pthread_mutex_lock error code 22

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pthread_mutex_lock error checking

Pthread mutex lock Error Checking 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 Pthread mutex lock Example thread blocks until the mutex becomes available This operation returns with pthread mutex lock return value the mutex object referenced by mutex in the locked state with the calling thread as its Man Pthread mutex lock owner If the