1998-09-26 00:34:39 +04:00
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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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1999-04-22 01:40:44 +04:00
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* Version 1.1 (the "NPL"); you may not use this file except in
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1998-09-26 00:34:39 +04:00
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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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#ifndef prolock_h___
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#define prolock_h___
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#include "prtypes.h"
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PR_BEGIN_EXTERN_C
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#if defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)
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/*
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** A locking mechanism, built on the existing PRLock definiion,
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** is provided that will permit applications to define a Lock
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** Hierarchy (or Lock Ordering) schema. An application designed
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** using the Ordered Lock functions will terminate with a
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** diagnostic message when a lock inversion condition is
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** detected.
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**
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** The lock ordering detection is complile-time enabled only. in
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** optimized builds of NSPR, the Ordered Lock functions map
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** directly to PRLock functions, providing no lock order
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** detection.
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**
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** The Ordered Lock Facility is compiled in when DEBUG is defined at
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** compile time. Ordered Lock can be forced on in optimized builds by
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** defining FORCE_NSPR_ORDERED_LOCK at compile time. Both the
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** application using Ordered Lock and NSPR must be compiled with the
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** facility enabled to achieve the desired results.
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**
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** Application designers should use the macro interfaces to the Ordered
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** Lock facility to ensure that it is compiled out in optimized builds.
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**
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** Application designers are responsible for defining their own
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** lock hierarchy.
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**
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** Ordered Lock is thread-safe and SMP safe.
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**
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** See Also: prlock.h
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**
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** /lth. 10-Jun-1998.
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**
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*/
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/*
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** Opaque type for ordered lock.
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** ... Don't even think of looking in here.
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**
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*/
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typedef void * PROrderedLock;
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_CreateOrderedLock() -- Create an Ordered Lock
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**
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** DESCRIPTION: PR_CreateOrderedLock() creates an ordered lock.
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**
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** INPUTS:
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** order: user defined order of this lock.
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** name: name of the lock. For debugging purposes.
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**
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** OUTPUTS: returned
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**
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** RETURNS: PR_OrderedLock pointer
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**
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** RESTRICTIONS:
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**
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*/
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#define PR_CREATE_ORDERED_LOCK(order,name)\
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PR_CreateOrderedLock((order),(name))
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PR_EXTERN(PROrderedLock *)
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PR_CreateOrderedLock(
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PRInt32 order,
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const char *name
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_DestroyOrderedLock() -- Destroy an Ordered Lock
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**
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** DESCRIPTION: PR_DestroyOrderedLock() destroys the ordered lock
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** referenced by lock.
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**
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** INPUTS: lock: pointer to a PROrderedLock
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**
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** OUTPUTS: the lock is destroyed
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#define PR_DESTROY_ORDERED_LOCK(lock) PR_DestroyOrderedLock((lock))
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PR_EXTERN(void)
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PR_DestroyOrderedLock(
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PROrderedLock *lock
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_LockOrderedLock() -- Lock an ordered lock
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**
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** DESCRIPTION: PR_LockOrderedLock() locks the ordered lock
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** referenced by lock. If the order of lock is less than or equal
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** to the order of the highest lock held by the locking thread,
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** the function asserts.
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**
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** INPUTS: lock: a pointer to a PROrderedLock
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**
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** OUTPUTS: The lock is held or the fucntion asserts.
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**
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** RETURNS: void
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**
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** RESTRICTIONS:
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**
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*/
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#define PR_LOCK_ORDERED_LOCK(lock) PR_LockOrderedLock((lock))
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PR_EXTERN(void)
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PR_LockOrderedLock(
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PROrderedLock *lock
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);
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/* -----------------------------------------------------------------------
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** FUNCTION: PR_UnlockOrderedLock() -- unlock and Ordered Lock
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**
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** DESCRIPTION: PR_UnlockOrderedLock() unlocks the lock referenced
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** by lock.
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**
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** INPUTS: lock: a pointer to a PROrderedLock
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**
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** OUTPUTS: the lock is unlocked
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**
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** RETURNS:
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** PR_SUCCESS
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** PR_FAILURE
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**
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** RESTRICTIONS:
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**
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*/
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#define PR_UNLOCK_ORDERED_LOCK(lock) PR_UnlockOrderedLock((lock))
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PR_EXTERN(PRStatus)
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PR_UnlockOrderedLock(
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PROrderedLock *lock
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);
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#else /* !(defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)) */
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/*
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** Map PROrderedLock and methods onto PRLock when ordered locking
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** is not compiled in.
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**
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*/
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#include <prlock.h>
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typedef PRLock PROrderedLock;
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#define PR_CREATE_ORDERED_LOCK(order) PR_NewLock()
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#define PR_DESTROY_ORDERED_LOCK(lock) PR_DestroyLock((lock))
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#define PR_LOCK_ORDERED_LOCK(lock) PR_Lock((lock))
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#define PR_UNLOCK_ORDERED_LOCK(lock) PR_Unlock((lock))
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#endif /* !(defined(DEBUG) || defined(FORCE_NSPR_ORDERED_LOCKS)) */
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PR_END_EXTERN_C
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#endif /* prolock_h___ */
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