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prrwlock.h
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* ** 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. ** ***********************************************************************/ NSPR_API(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 ***********************************************************************/ NSPR_API(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 ***********************************************************************/ NSPR_API(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 ***********************************************************************/ NSPR_API(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 ***********************************************************************/ NSPR_API(void) PR_RWLock_Unlock(PRRWLock *lock); PR_END_EXTERN_C #endif /* prrwlock_h___ */