pthread_rwlock_wrlock(3)
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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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