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121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape Portable Runtime (NSPR).
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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** File: prrwlock.h
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** Description: API to basic reader-writer lock functions of NSPR.
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**
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**/
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#ifndef prrwlock_h___
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#define prrwlock_h___
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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/*
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* PRRWLock --
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*
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* The reader writer lock, PRRWLock, is an opaque object to the clients
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* of NSPR. All routines operate on a pointer to this opaque entity.
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*/
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typedef struct PRRWLock PRRWLock;
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#define PR_RWLOCK_RANK_NONE 0
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/***********************************************************************
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** FUNCTION: PR_NewRWLock
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** DESCRIPTION:
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** Returns a pointer to a newly created reader-writer lock object.
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** INPUTS: Lock rank
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** Lock name
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** OUTPUTS: void
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** RETURN: PRRWLock*
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** If the lock cannot be created because of resource constraints, NULL
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** is returned.
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**
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***********************************************************************/
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NSPR_API(PRRWLock*) PR_NewRWLock(PRUint32 lock_rank, const char *lock_name);
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/***********************************************************************
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** FUNCTION: PR_DestroyRWLock
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** DESCRIPTION:
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** Destroys a given RW lock object.
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** INPUTS: PRRWLock *lock - Lock to be freed.
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** OUTPUTS: void
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** RETURN: None
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***********************************************************************/
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NSPR_API(void) PR_DestroyRWLock(PRRWLock *lock);
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/***********************************************************************
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** FUNCTION: PR_RWLock_Rlock
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** DESCRIPTION:
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** Apply a read lock (non-exclusive) on a RWLock
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** INPUTS: PRRWLock *lock - Lock to be read-locked.
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** OUTPUTS: void
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** RETURN: None
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***********************************************************************/
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NSPR_API(void) PR_RWLock_Rlock(PRRWLock *lock);
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/***********************************************************************
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** FUNCTION: PR_RWLock_Wlock
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** DESCRIPTION:
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** Apply a write lock (exclusive) on a RWLock
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** INPUTS: PRRWLock *lock - Lock to write-locked.
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** OUTPUTS: void
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** RETURN: None
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***********************************************************************/
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NSPR_API(void) PR_RWLock_Wlock(PRRWLock *lock);
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/***********************************************************************
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** FUNCTION: PR_RWLock_Unlock
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** DESCRIPTION:
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** Release a RW lock. Unlocking an unlocked lock has undefined results.
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** INPUTS: PRRWLock *lock - Lock to unlocked.
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** OUTPUTS: void
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** RETURN: void
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***********************************************************************/
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NSPR_API(void) PR_RWLock_Unlock(PRRWLock *lock);
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PR_END_EXTERN_C
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#endif /* prrwlock_h___ */
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