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/*
* Copyright (c) 1994, 1995. Netscape Communications Corporation. All
* rights reserved.
*
* Use of this software is governed by the terms of the license agreement for
* the Netscape Communications or Netscape Comemrce Server between the
* parties.
*/
/* ------------------------------------------------------------------------ */
/*
* crit.h: Critical section abstraction. Used in threaded servers to protect
* areas where two threads can interfere with each other.
*
* Condvars are condition variables that are used for thread-thread
* synchronization.
*
* Rob McCool
*/
#ifndef CRIT_H
#define CRIT_H
#ifdef USE_NSPR
#include <nspr/prmon.h>
typedef PRMonitor* CRITICAL;
#else
typedef void *CRITICAL;
#endif
/*
* crit_init creates and returns a new critical section variable. At the
* time of creation no one has entered it.
*/
#ifdef USE_NSPR
#define crit_init() PR_NewMonitor(0)
#else
#define crit_init() (NULL)
#endif
/*
* crit_enter enters a critical section. If someone is already in the
* section, the calling thread is blocked until that thread exits.
*/
#ifdef USE_NSPR
#define crit_enter(id) PR_EnterMonitor(id)
#else
#define crit_enter(id) (0)
#endif
/*
* crit_exit exits a critical section. If another thread is blocked waiting
* to enter, it will be unblocked and given ownership of the section.
*/
#ifdef USE_NSPR
#define crit_exit(id) PR_ExitMonitor(id)
#else
#define crit_exit(id) (0)
#endif
/*
* crit_terminate removes a previously allocated critical section variable.
*/
#ifdef USE_NSPR
#define crit_terminate(id) PR_DestroyMonitor(id)
#else
#define crit_terminate(id) (0)
#endif
#ifdef USE_NSPR
typedef PRMonitor* CONDVAR;
#else
typedef void* CONDVAR;
#endif
/*
* condvar_init initializes and returns a new condition variable. You
* must provide a critical section to be associated with this condition
* variable.
*/
#ifdef USE_NSPR
#define condvar_init(crit) (crit)
#else
#define condvar_init(crit) (crit)
#endif
/*
* condvar_wait blocks on the given condition variable. The calling thread
* will be blocked until another thread calls condvar_notify on this variable.
* The caller must have entered the critical section associated with this
* condition variable prior to waiting for it.
*/
#ifdef USE_NSPR
#define condvar_wait(cv) (PR_Wait(cv, LL_MAXINT))
#else
#define condvar_wait(cv) (0)
#endif
/*
* condvar_notify awakens any threads blocked on the given condition
* variable. The caller must have entered the critical section associated
* with this variable first.
*/
#ifdef USE_NSPR
#define condvar_notify(cv) (PR_Notify(cv))
#else
#define condvar_notify(cv) (0)
#endif
/*
* condvar_terminate frees the given previously allocated condition variable
*/
#ifdef USE_NSPR
#define condvar_terminate(cv) (0)
#else
#define condvar_terminate(cv) (0)
#endif
#endif
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