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pthread_rwlock_unlock(3)

NAME

     pthread_rwlock_unlock -- release a read/write lock

LIBRARY

     Reentrant C Library (libc_r, -lc_r)
     POSIX Threads Library (libpthread, -lpthread)
     1:1 Threading Library (libthr, -lthr)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_rwlock_unlock(pthread_rwlock_t *lock);

DESCRIPTION

     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().

RETURN VALUES

     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 lock is not held by the calling thread.

SEE ALSO

     pthread_rwlock_rdlock(3), pthread_rwlock_wrlock(3)

STANDARDS

     The pthread_rwlock_unlock() function is expected to conform to Version 2
     of the Single UNIX Specification (``SUSv2'').

ERRORS

     The pthread_rwlock_unlock() function may fail if:

     [EINVAL]		The value specified by lock is invalid.

     [EPERM]		The current thread does not own the read/write lock.

HISTORY

     The pthread_rwlock_unlock() function first appeared in FreeBSD 3.0.

FreeBSD 5.4			August 4, 1998			   FreeBSD 5.4

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