pthread_rwlock_wrlock man page on HP-UX

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pthread_rwlock_wrlock(3T)			     pthread_rwlock_wrlock(3T)

NAME
       pthread_rwlock_wrlock(),	 pthread_rwlock_trywrlock()  - lock or attempt
       to lock a read-write lock for writing

SYNOPSIS
PARAMETERS
	      rwlock	Pointer to the read-write lock to be locked for	 writ‐
			ing.

DESCRIPTION
       The  function applies a write lock to the read-write lock object refer‐
       enced by rwlock.	 The calling thread acquires  the  write  lock	if  no
       other thread (reader or writer) holds the read-write lock rwlock.  Oth‐
       erwise, the thread blocks (that is, it does not return from  the	 call)
       until  it  can  acquire the lock.  Results are undefined if the calling
       thread holds the read-write lock (whether a read or a  write  lock)  at
       the time the call is made.

       The function applies a write lock as in the function with the exception
       that the function fails if any thread currently holds rwlock (for read‐
       ing or writing).

       Results	are  undefined	if  any	 of these functions are called with an
       uninitialized read-write lock.

       If a signal is delivered to a thread waiting  for  a  read-write	 lock,
       upon  return  from  the signal handler, the thread shall resume waiting
       for the read-write lock as if it was not interrupted.

RETURN VALUE
       Upon successful completion, and return zero. Otherwise, an error number
       is returned to indicate the error (the variable is not set).

ERRORS
       If  any	of the following occur, the function returns the corresponding
       error number:

	      [EBUSY]	     The read-write lock rwlock could not be  acquired
			     for  writing  because  it	was already locked for
			     reading or writing.

       For each of the following conditions, if the condition is detected, the
       and functions return the corresponding error number:

	      [EINVAL]	     The  value	 specified by rwlock does not refer to
			     an initialized read-write lock.

	      [EDEADLK]	     The current thread already	 owns  the  read-write
			     lock for reading or writing.

AUTHOR
       and were developed by X/Open.

SEE ALSO
       pthread_rwlock_init(3T),			   pthread_rwlock_destroy(3T),
       pthread_rwlock_tryrdlock(3T),		    pthread_rwlock_rdlock(3T),
       pthread_rwlock_unlock(3T).

STANDARDS CONFORMANCE
				Pthread Library	     pthread_rwlock_wrlock(3T)
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