pthread_rwlock_unlock(3) BSD Library Functions Manual pthread_rwlock_unlock(3)
pthread_rwlock_unlock -- release a read/write lock
#include <pthread.h> int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);
The pthread_rwlock_unlock() function is used to release the read/write lock previously obtained by pthread_rwlock_rdlock(), pthread_rwlock_wrlock(), pthread_rwlock_tryrdlock(), or pthread_rwlock_trywrlock().
If successful, the pthread_rwlock_unlock() function will return zero. Otherwise, an error number will be returned to indicate the error. The results are undefined if rwlock is not held by the calling thread.
The pthread_rwlock_unlock() function is expected to conform to Version 2 of the Single UNIX Specification (``SUSv2'').
The pthread_rwlock_unlock() function may fail if: [EINVAL] The value specified by rwlock is invalid. [EPERM] The current thread does not own the read/write lock.
The pthread_rwlock_unlock() function first appeared in FreeBSD 3.0. BSD August 4, 1998 BSD
Mac OS X 10.8 - Generated Thu Aug 30 10:03:19 CDT 2012