1 files changed, 108 insertions, 0 deletions
diff --git a/man3p/pthread_rwlock_wrlock.3p b/man3p/pthread_rwlock_wrlock.3p
new file mode 100644
index 000000000..cab2a76ae
--- /dev/null
+++ b/man3p/pthread_rwlock_wrlock.3p
@@ -0,0 +1,108 @@
+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PTHREAD_RWLOCK_TRYWRLOCK" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pthread_rwlock_trywrlock 
+.SH NAME
+pthread_rwlock_trywrlock, pthread_rwlock_wrlock \- lock a read-write
+lock object for writing
+.SH SYNOPSIS
+.LP
+\fB#include <pthread.h>
+.br
+.sp
+int pthread_rwlock_trywrlock(pthread_rwlock_t\fP \fI*rwlock\fP\fB);
+.br
+int pthread_rwlock_wrlock(pthread_rwlock_t\fP \fI*rwlock\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpthread_rwlock_trywrlock\fP() function shall apply a write
+lock like the \fIpthread_rwlock_wrlock\fP() function, with
+the exception that the function shall fail if any thread currently
+holds \fIrwlock\fP (for reading or writing).
+.LP
+The \fIpthread_rwlock_wrlock\fP() function shall apply a write lock
+to the read-write lock referenced by \fIrwlock\fP. The
+calling thread acquires the write lock if no other thread (reader
+or writer) holds the read-write lock \fIrwlock\fP. Otherwise,
+the thread shall block until it can acquire the lock. The calling
+thread may deadlock if at the time the call is made it holds the
+read-write lock (whether a read or write lock).
+.LP
+Implementations may favor writers over readers to avoid writer starvation.
+.LP
+Results are undefined if any of these functions are called with an
+uninitialized read-write lock.
+.LP
+If a signal is delivered to a thread waiting for a read-write lock
+for writing, upon return from the signal handler the thread
+resumes waiting for the read-write lock for writing as if it was not
+interrupted.
+.SH RETURN VALUE
+.LP
+The \fIpthread_rwlock_trywrlock\fP() function shall return zero if
+the lock for writing on the read-write lock object
+referenced by \fIrwlock\fP is acquired. Otherwise, an error number
+shall be returned to indicate the error.
+.LP
+If successful, the \fIpthread_rwlock_wrlock\fP() function shall return
+zero; otherwise, an error number shall be returned to
+indicate the error.
+.SH ERRORS
+.LP
+The \fIpthread_rwlock_trywrlock\fP() function shall fail if:
+.TP 7
+.B EBUSY
+The read-write lock could not be acquired for writing because it was
+already locked for reading or writing.
+.sp
+.LP
+The \fIpthread_rwlock_trywrlock\fP() and \fIpthread_rwlock_wrlock\fP()
+functions may fail if:
+.TP 7
+.B EINVAL
+The value specified by \fIrwlock\fP does not refer to an initialized
+read-write lock object.
+.sp
+.LP
+The \fIpthread_rwlock_wrlock\fP() function may fail if:
+.TP 7
+.B EDEADLK
+The current thread already owns the read-write lock for writing or
+reading.
+.sp
+.LP
+These functions shall not return an error code of [EINTR].
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Applications using these functions may be subject to priority inversion,
+as discussed in the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 3.285, Priority Inversion.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIpthread_rwlock_destroy\fP() , \fIpthread_rwlock_rdlock\fP() , \fIpthread_rwlock_timedrdlock\fP()
+, \fIpthread_rwlock_timedwrlock\fP() , \fIpthread_rwlock_tryrdlock\fP()
+, \fIpthread_rwlock_unlock\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<pthread.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .