gecko-dev/nsprpub/pr/include/prrwlock.h
1999-02-25 19:58:12 +00:00

102 lines
3.2 KiB
C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
** File: prrwlock.h
** Description: API to basic reader-writer lock functions of NSPR.
**
**/
#ifndef prrwlock_h___
#define prrwlock_h___
#include "prtypes.h"
PR_BEGIN_EXTERN_C
/*
* PRRWLock --
*
* The reader writer lock, PRRWLock, is an opaque object to the clients
* of NSPR. All routines operate on a pointer to this opaque entity.
*/
typedef struct PRRWLock PRRWLock;
#define PR_RWLOCK_RANK_NONE 0
/***********************************************************************
** FUNCTION: PR_NewRWLock
** DESCRIPTION:
** Returns a pointer to a newly created reader-writer lock object.
** INPUTS: Lock rank
** Lock name
** OUTPUTS: void
** RETURN: PRRWLock*
** If the lock cannot be created because of resource constraints, NULL
** is returned.
**
***********************************************************************/
PR_EXTERN(PRRWLock*) PR_NewRWLock(PRUint32 lock_rank, const char *lock_name);
/***********************************************************************
** FUNCTION: PR_DestroyRWLock
** DESCRIPTION:
** Destroys a given RW lock object.
** INPUTS: PRRWLock *lock - Lock to be freed.
** OUTPUTS: void
** RETURN: None
***********************************************************************/
PR_EXTERN(void) PR_DestroyRWLock(PRRWLock *lock);
/***********************************************************************
** FUNCTION: PR_RWLock_Rlock
** DESCRIPTION:
** Apply a read lock (non-exclusive) on a RWLock
** INPUTS: PRRWLock *lock - Lock to be read-locked.
** OUTPUTS: void
** RETURN: None
***********************************************************************/
PR_EXTERN(void) PR_RWLock_Rlock(PRRWLock *lock);
/***********************************************************************
** FUNCTION: PR_RWLock_Wlock
** DESCRIPTION:
** Apply a write lock (exclusive) on a RWLock
** INPUTS: PRRWLock *lock - Lock to write-locked.
** OUTPUTS: void
** RETURN: None
***********************************************************************/
PR_EXTERN(void) PR_RWLock_Wlock(PRRWLock *lock);
/***********************************************************************
** FUNCTION: PR_RWLock_Unlock
** DESCRIPTION:
** Release a RW lock. Unlocking an unlocked lock has undefined results.
** INPUTS: PRRWLock *lock - Lock to unlocked.
** OUTPUTS: void
** RETURN: void
***********************************************************************/
PR_EXTERN(void) PR_RWLock_Unlock(PRRWLock *lock);
PR_END_EXTERN_C
#endif /* prrwlock_h___ */