"PTHREAD_RWLOCK_UNLOCK"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

pthread_rwlock_unlock - unlock a read-write lock object +

Synopsis

#include <pthread.h> +

int pthread_rwlock_unlock(pthread_rwlock_t *rwlock); + +

Description

The pthread_rwlock_unlock function shall release a lock +held on the read-write lock object referenced by rwlock. +Results are undefined if the read-write lock rwlock is not +held by the calling thread. +

If this function is called to release a read lock from the +read-write lock object and there are other read locks currently held +on this read-write lock object, the read-write lock object remains in +the read locked state. If this function releases the last read lock +for this read-write lock object, the read-write lock object shall be +put in the unlocked state with no owners. +

If this function is called to release a write lock for this +read-write lock object, the read-write lock object shall be put in +the unlocked state. +

Pthreads-win32 does not prefer either writers or readers in +acquiring the lock – all threads enter a single prioritised FIFO +queue. While this may not be optimally efficient for some +applications, it does ensure that one type does not starve the other.

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

Pthreads-w32 defines _POSIX_READER_WRITER_LOCKS in +pthread.h as 200112L to indicate that the reader/writer routines are +implemented and may be used.

Return Value

If successful, the pthread_rwlock_unlock function shall +return zero; otherwise, an error number shall be returned to indicate +the error. +

Errors

The pthread_rwlock_unlock function may fail if: +

EINVAL +: + The value specified by rwlock does not refer to an + initialized read-write lock object. +; +

+

+The pthread_rwlock_unlock function shall not return an error +code of [EINTR]. +

The following sections are informative. +

Examples

None. +

Application Usage

None. +

Rationale

None. +

Future Directions

None. +

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 +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
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Synopsis +
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Description +
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Return + Value +
+
Errors +
+
Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
See + Also +
+
Copyright +
+

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