pthread_mutex_lock(3) [mojave man page]
PTHREAD_MUTEX_LOCK(3) BSD Library Functions Manual PTHREAD_MUTEX_LOCK(3) NAME
pthread_mutex_lock -- lock a mutex SYNOPSIS
#include <pthread.h> int pthread_mutex_lock(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 avail- able. RETURN VALUES
If successful, pthread_mutex_lock() will return zero, otherwise an error number will be returned to indicate the error. ERRORS
The pthread_mutex_lock() function will fail if: [EINVAL] The value specified by mutex is invalid. [EDEADLK] A deadlock would occur if the thread blocked waiting for mutex. SEE ALSO
pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_trylock(3), pthread_mutex_unlock(3) STANDARDS
The pthread_mutex_lock() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1''). BSD
January 31, 2006 BSD
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PTHREAD_MUTEX_TRYLOCK(3) BSD Library Functions Manual PTHREAD_MUTEX_TRYLOCK(3) NAME
pthread_mutex_trylock -- attempt to lock a mutex without blocking LIBRARY
POSIX Threads Library (libpthread, -lpthread) SYNOPSIS
#include <pthread.h> int pthread_mutex_trylock(pthread_mutex_t *mutex); DESCRIPTION
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_trylock() will return zero, otherwise an error number will be returned to indicate the error. ERRORS
The pthread_mutex_trylock() function will fail if: [EINVAL] The value specified by mutex is invalid. [EBUSY] Mutex is already locked. SEE ALSO
pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_unlock(3) STANDARDS
The pthread_mutex_trylock() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1''). BSD
July 30, 1998 BSD