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rw_wrlock(3scl)						       rw_wrlock(3scl)

NAME
       rw_wrlock - Locks a readers/writer lock for write access.

LIBRARY
       SCL Threads Library (libthread.so)

SYNOPSIS
       #include <synch.h>

       int rw_wrlock(
		      rwlock_t *rwlockp );

PARAMETERS
       Address of the readers/writer lock to be write-locked.

DESCRIPTION
       This routine locks a readers/writer lock for write access. If the read‐
       ers/writer lock is already locked (either for read  or  write  access),
       this routine blocks until it can acquire the lock for write access.

SCL IMPLEMENTATION NOTES
       rw_wrlock(3scl) is implemented by calling tis_write_lock(3).

       rw_wrlock(3scl) first checks if the readers/writer lock is valid: if it
       is not, then the readers/writer lock is initialized  for	 intra-process
       thread synchronization (type USYNC_THREAD).

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.     Error    from    tis_rwlock_init(3)    or
       tis_write_lock(3). A message is written to the SCL errorlog which  out‐
       lines the error-code mapping. Or:

       An  internal  implementation  error occurred. Refer to the SCL errorlog
       for additional information.

       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_unlock(3scl),	       rwlock_destroy(3scl),	    rwlock_init(3scl),
       scl_intro(3scl),	     scl_thread_intro(3scl),	   tis_rwlock_init(3),
       tis_write_lock(3)

       Files: scl_error_log(4scl)

       Manuals: Solaris Compatibility Libraries User's Guide

							       rw_wrlock(3scl)
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