mirror of
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142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 nsTimerImpl_h___
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#define nsTimerImpl_h___
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//#define FORCE_PR_LOG /* Allow logging in the release build */
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#include "nsITimer.h"
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#include "nsIEventTarget.h"
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#include "nsIObserver.h"
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#include "nsCOMPtr.h"
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#include "prlog.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/Attributes.h"
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#if defined(PR_LOGGING)
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extern PRLogModuleInfo *GetTimerLog();
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#define DEBUG_TIMERS 1
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#else
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#undef DEBUG_TIMERS
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#endif
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#define NS_TIMER_CID \
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{ /* 5ff24248-1dd2-11b2-8427-fbab44f29bc8 */ \
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0x5ff24248, \
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0x1dd2, \
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0x11b2, \
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{0x84, 0x27, 0xfb, 0xab, 0x44, 0xf2, 0x9b, 0xc8} \
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}
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enum {
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CALLBACK_TYPE_UNKNOWN = 0,
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CALLBACK_TYPE_INTERFACE = 1,
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CALLBACK_TYPE_FUNC = 2,
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CALLBACK_TYPE_OBSERVER = 3
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};
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class nsTimerImpl MOZ_FINAL : public nsITimer
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{
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public:
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typedef mozilla::TimeStamp TimeStamp;
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nsTimerImpl();
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static NS_HIDDEN_(nsresult) Startup();
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static NS_HIDDEN_(void) Shutdown();
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friend class TimerThread;
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friend struct TimerAdditionComparator;
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void Fire();
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nsresult PostTimerEvent();
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void SetDelayInternal(uint32_t aDelay);
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSITIMER
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int32_t GetGeneration() { return mGeneration; }
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private:
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~nsTimerImpl();
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nsresult InitCommon(uint32_t aType, uint32_t aDelay);
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void ReleaseCallback()
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{
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// if we're the last owner of the callback object, make
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// sure that we don't recurse into ReleaseCallback in case
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// the callback's destructor calls Cancel() or similar.
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uint8_t cbType = mCallbackType;
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mCallbackType = CALLBACK_TYPE_UNKNOWN;
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if (cbType == CALLBACK_TYPE_INTERFACE)
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NS_RELEASE(mCallback.i);
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else if (cbType == CALLBACK_TYPE_OBSERVER)
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NS_RELEASE(mCallback.o);
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}
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bool IsRepeating() const {
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PR_STATIC_ASSERT(TYPE_ONE_SHOT < TYPE_REPEATING_SLACK);
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PR_STATIC_ASSERT(TYPE_REPEATING_SLACK < TYPE_REPEATING_PRECISE);
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PR_STATIC_ASSERT(TYPE_REPEATING_PRECISE < TYPE_REPEATING_PRECISE_CAN_SKIP);
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return mType >= TYPE_REPEATING_SLACK;
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}
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bool IsRepeatingPrecisely() const {
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return mType >= TYPE_REPEATING_PRECISE;
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}
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nsCOMPtr<nsIEventTarget> mEventTarget;
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void * mClosure;
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union CallbackUnion {
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nsTimerCallbackFunc c;
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nsITimerCallback * i;
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nsIObserver * o;
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} mCallback;
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// Some callers expect to be able to access the callback while the
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// timer is firing.
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nsCOMPtr<nsITimerCallback> mTimerCallbackWhileFiring;
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// These members are set by Init (called from NS_NewTimer) and never reset.
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uint8_t mCallbackType;
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// These members are set by the initiating thread, when the timer's type is
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// changed and during the period where it fires on that thread.
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uint8_t mType;
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bool mFiring;
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// Use a bool (int) here to isolate loads and stores of these two members
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// done on various threads under the protection of TimerThread::mLock, from
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// loads and stores done on the initiating/type-changing/timer-firing thread
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// to the above uint8_t/bool members.
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bool mArmed;
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bool mCanceled;
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// The generation number of this timer, re-generated each time the timer is
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// initialized so one-shot timers can be canceled and re-initialized by the
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// arming thread without any bad race conditions.
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int32_t mGeneration;
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uint32_t mDelay;
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TimeStamp mTimeout;
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#ifdef DEBUG_TIMERS
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TimeStamp mStart, mStart2;
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static double sDeltaSum;
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static double sDeltaSumSquared;
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static double sDeltaNum;
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#endif
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};
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#endif /* nsTimerImpl_h___ */
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