зеркало из https://github.com/mozilla/gecko-dev.git
102 строки
3.2 KiB
C
102 строки
3.2 KiB
C
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/*
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** File: prrwlock.h
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** Description: API to basic reader-writer lock functions of NSPS.
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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 NSPS. 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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PR_EXTERN(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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PR_EXTERN(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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PR_EXTERN(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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PR_EXTERN(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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PR_EXTERN(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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