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89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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