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97 lines
3.2 KiB
C
97 lines
3.2 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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#ifndef prmon_h___
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#define prmon_h___
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#include "prtypes.h"
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#include "prinrval.h"
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PR_BEGIN_EXTERN_C
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typedef struct PRMonitor PRMonitor;
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/*
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** Create a new monitor. Monitors are re-entrant locks with a single built-in
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** condition variable.
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**
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** This may fail if memory is tight or if some operating system resource
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** is low.
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*/
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NSPR_API(PRMonitor*) PR_NewMonitor(void);
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/*
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** Destroy a monitor. The caller is responsible for guaranteeing that the
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** monitor is no longer in use. There must be no thread waiting on the monitor's
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** condition variable and that the lock is not held.
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**
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*/
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NSPR_API(void) PR_DestroyMonitor(PRMonitor *mon);
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/*
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** Enter the lock associated with the monitor. If the calling thread currently
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** is in the monitor, the call to enter will silently succeed. In either case,
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** it will increment the entry count by one.
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*/
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NSPR_API(void) PR_EnterMonitor(PRMonitor *mon);
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/*
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** Decrement the entry count associated with the monitor. If the decremented
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** entry count is zero, the monitor is exited. Returns PR_FAILURE if the
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** calling thread has not entered the monitor.
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*/
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NSPR_API(PRStatus) PR_ExitMonitor(PRMonitor *mon);
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/*
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** Wait for a notify on the monitor's condition variable. Sleep for "ticks"
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** amount of time (if "ticks" is PR_INTERVAL_NO_TIMEOUT then the sleep is
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** indefinite).
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**
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** While the thread is waiting it exits the monitor (as if it called
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** PR_ExitMonitor as many times as it had called PR_EnterMonitor). When
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** the wait has finished the thread regains control of the monitors lock
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** with the same entry count as before the wait began.
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**
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** The thread waiting on the monitor will be resumed when the monitor is
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** notified (assuming the thread is the next in line to receive the
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** notify) or when the "ticks" timeout elapses.
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**
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** Returns PR_FAILURE if the caller has not entered the monitor.
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*/
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NSPR_API(PRStatus) PR_Wait(PRMonitor *mon, PRIntervalTime ticks);
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/*
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** Notify a thread waiting on the monitor's condition variable. If a thread
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** is waiting on the condition variable (using PR_Wait) then it is awakened
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** and attempts to reenter the monitor.
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*/
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NSPR_API(PRStatus) PR_Notify(PRMonitor *mon);
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/*
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** Notify all of the threads waiting on the monitor's condition variable.
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** All of threads waiting on the condition are scheduled to reenter the
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** monitor.
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*/
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NSPR_API(PRStatus) PR_NotifyAll(PRMonitor *mon);
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/*
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** PR_ASSERT_CURRENT_THREAD_IN_MONITOR
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** If the current thread is in |mon|, this assertion is guaranteed to
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** succeed. Otherwise, the behavior of this function is undefined.
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*/
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#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
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#define PR_ASSERT_CURRENT_THREAD_IN_MONITOR(/* PRMonitor* */ mon) \
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PR_AssertCurrentThreadInMonitor(mon)
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#else
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#define PR_ASSERT_CURRENT_THREAD_IN_MONITOR(/* PRMonitor* */ mon)
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#endif
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/* Don't call this function directly. */
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NSPR_API(void) PR_AssertCurrentThreadInMonitor(PRMonitor *mon);
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PR_END_EXTERN_C
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#endif /* prmon_h___ */
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