rw_unlock man page on Tru64

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rw_unlock(3scl)						       rw_unlock(3scl)

NAME
       rw_unlock - Unlocks a readers/writer lock.

LIBRARY
       SCL Threads Library (libthread.so)

SYNOPSIS
       #include <synch.h>

       int rw_unlock(
		      rwlock_t *rwlockp );

PARAMETERS
       Address of the readers/writer lock to be unlocked.

DESCRIPTION
       This  routine  unlocks the readers/writer lock specified by the rwlockp
       argument.  The readers/writer lock must be locked by the caller	either
       for  read or write access. Unlocking the readers/writer lock may enable
       any other threads waiting for the readers/writer lock to proceed.

SCL IMPLEMENTATION NOTES
       rw_unlock(3scl) is implemented by calling either tis_read_unlock(3)  or
       tis_write_unlock(3):  the  readers/writer lock is examined to determine
       if it is read-locked or write-locked, so that  the  appropriate	unlock
       function is called.

       If  the	specified  readers/writer lock is not valid (i.e. has not been
       initialized), then this routine returns 0, to be	 consistent  with  the
       observed Solaris behaviour.

RETURN VALUES
       If  an  error  condition	 occurs, this routine returns an integer value
       indicating the type of error.

       Additional error return information may be written  to  the  SCL	 error
       log.  Refer to scl_error_log(4scl) for details.

       Possible return values are as follows: Successful completion. Or:

       The  readers/writer  lock  is  invalid  (un-initialized).   An internal
       implementation error occurred. Refer to the SCL errorlog for additional
       information.  A	possible  cause is that the readers/writer lock is not
       locked by this thread.

       Note: EFAULT is not returned if rwlockp is an illegal address. An ille‐
       gal address generates a SIGSEGV signal, which by default will abort the
       process and generate a core dump.

ERRORS
       None.

RELATED INFORMATION
       Functions:  rw_rdlock(3scl),  rw_tryrdlock(3scl),   rw_trywrlock(3scl),
       rw_wrlock(3scl),	       rwlock_destroy(3scl),	    rwlock_init(3scl),
       scl_intro(3scl),	     scl_thread_intro(3scl),	   tis_read_unlock(3),
       tis_write_trylock(3)

       Files: scl_error_log(4scl)

       Manuals: Solaris Compatibility Libraries User's Guide

							       rw_unlock(3scl)
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