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