PTHREAD_RWLOCK_TIMEDWRLOCK(3)				   BSD Library Functions Manual 			     PTHREAD_RWLOCK_TIMEDWRLOCK(3)

NAME

     pthread_rwlock_timedwrlock -- acquire a read-write lock for writing or give up after a specified period

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock, const struct timespec *abs_timeout);

DESCRIPTION

     This function acquires a write lock on the read-write lock rwlock.  However, if the lock cannot be acquired without waiting for another
     thread to unlock the lock, this wait shall be terminated when abs_timeout expires.

     If the thread should be interrupted by a signal, the pthread_rwlock_timedwrlock() function will be automatically restarted after the thread
     returns from the signal handler.

     The calling thread may deadlock if at the time the call is made it holds rwlock.  The results are undefined if this function is called with
     an uninitialized read-write lock.

IMPLEMENTATION NOTES

     To prevent writer starvation, writers are favored over readers.

RETURN VALUES

     If successful, the pthread_rwlock_timedwrlock() function will return zero.  Otherwise, an error number will be returned to indicate the
     error.

     This function shall not return an error code of EINTR.

ERRORS

     The pthread_rwlock_timedwrlock() function shall fail if:

     [ETIMEDOUT]	The lock could not be acquired before the specified timeout expired.

     The pthread_rwlock_timedwrlock() function may fail if:

     [EDEADLK]		The calling thread already holds rwlock.

     [EINVAL]		The value specified by rwlock does not refer to an initialized read-write lock object, or the abs_timeout nanosecond value
			is less than zero or greater than or equal to 1 billion.

SEE ALSO

     pthread_rwlock_init(3), pthread_rwlock_timedrdlock(3), pthread_rwlock_unlock(3)

STANDARDS

     The pthread_rwlock_timedwrlock() function is expected to conform to ISO/IEC 9945-1:1996 (``POSIX.1'').

HISTORY

     The pthread_rwlock_timedwrlock() function first appeared in FreeBSD 5.2.

BSD
								 January 16, 2004							       BSD