pthread_mutex_lock(3) - NetBSD Manual Pages

PTHREAD_MUTEX_LOCK(3)   NetBSD Library Functions Manual  PTHREAD_MUTEX_LOCK(3)


NAME
pthread_mutex_lock, pthread_mutex_trylock -- acquire a lock on a mutex
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h> int pthread_mutex_lock(pthread_mutex_t *mutex); int pthread_mutex_trylock(pthread_mutex_t *mutex);
DESCRIPTION
The pthread_mutex_lock() function locks mutex. If the mutex is already locked, the calling thread will block until the mutex becomes available. The pthread_mutex_trylock() function locks mutex. If the mutex is already locked, pthread_mutex_trylock() will not block waiting for the mutex, but will return an error condition.
RETURN VALUES
If successful, pthread_mutex_lock() and pthread_mutex_trylock() will return zero, otherwise an error number will be returned to indicate the error.
ERRORS
pthread_mutex_lock() may fail if: [EDEADLK] A deadlock would occur if the thread blocked waiting for mutex. [EINVAL] The value specified by mutex is invalid. pthread_mutex_trylock() shall fail if: [EBUSY] Mutex is already locked. pthread_mutex_trylock() may fail if: [EINVAL] The value specified by mutex is invalid.
SEE ALSO
pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_unlock(3)
STANDARDS
pthread_mutex_lock() and pthread_mutex_trylock() conform to ISO/IEC 9945-1:1996 (``POSIX.1''). NetBSD 5.0.1 January 30, 2003 NetBSD 5.0.1

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