pthread_rwlock_wrlock(3) - NetBSD Manual Pages

PTHREAD_RWLOCK_WRLOC... NetBSD Library Functions ManualPTHREAD_RWLOCK_WRLOC...


NAME
pthread_rwlock_wrlock, pthread_rwlock_timedwrlock, pthread_rwlock_trywrlock -- acquire a read/write lock for writing
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h> int pthread_rwlock_wrlock(pthread_rwlock_t *lock); int pthread_rwlock_timedwrlock(pthread_rwlock_t * restrict lock, const struct timespec * restrict abstime); int pthread_rwlock_trywrlock(pthread_rwlock_t *lock);
DESCRIPTION
The pthread_rwlock_wrlock() function blocks until a write lock can be acquired against lock. The pthread_rwlock_timedwrlock() performs the same action, but will not wait beyond abstime to obtain the lock before returning. The pthread_rwlock_trywrlock() function performs the same action as pthread_rwlock_wrlock(), but does not block if the lock cannot be immedi- ately obtained. The results are undefined if the calling thread already holds the lock at the time the call is made.
RETURN VALUES
If successful, the pthread_rwlock_wrlock(), pthread_rwlock_timedwrlock(), and pthread_rwlock_trywrlock() functions will return zero. Otherwise an error number will be returned to indicate the error.
ERRORS
The pthread_rwlock_trywrlock() function shall fail if: [EBUSY] The calling thread is not able to acquire the lock without blocking. The pthread_rwlock_timedrdlock() function shall fail if: [ETIMEDOUT] The time specified by abstime was reached before the lock could be obtained. The pthread_rwlock_wrlock(), pthread_rwlock_timedwrlock(), and pthread_rwlock_trywrlock() functions may fail if: [EDEADLK] The calling thread already owns the read/write lock (for reading or writing). [EINVAL] The value specified by lock is invalid.
SEE ALSO
pthread_rwlock_destroy(3), pthread_rwlock_init(3), pthread_rwlock_rdlock(3), pthread_rwlock_unlock(3)
STANDARDS
pthread_rwlock_wrlock(), pthread_rwlock_timedwrlock(), and pthread_rwlock_trywrlock() conform to ISO/IEC 9945-1:1996 (``POSIX.1''). NetBSD 5.1 January 30, 2003 NetBSD 5.1

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