gecko-dev/xpcom/threads/nsTimerImpl.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 nsTimerImpl_h___
#define nsTimerImpl_h___
#include "nsITimer.h"
#include "nsIEventTarget.h"
#include "nsIObserver.h"
#include "nsCOMPtr.h"
#include "mozilla/Attributes.h"
#include "mozilla/Logging.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Variant.h"
#ifdef MOZ_TASK_TRACER
#include "TracedTaskCommon.h"
#endif
extern mozilla::LogModule* GetTimerLog();
#define NS_TIMER_CID \
{ /* 5ff24248-1dd2-11b2-8427-fbab44f29bc8 */ \
0x5ff24248, \
0x1dd2, \
0x11b2, \
{0x84, 0x27, 0xfb, 0xab, 0x44, 0xf2, 0x9b, 0xc8} \
}
class nsTimerImpl final : public nsITimer
{
public:
typedef mozilla::TimeStamp TimeStamp;
nsTimerImpl();
static nsresult Startup();
static void Shutdown();
friend class TimerThread;
friend class nsTimerEvent;
friend struct TimerAdditionComparator;
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSITIMER
virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const override;
private:
void SetDelayInternal(uint32_t aDelay);
void Fire();
#ifdef MOZ_TASK_TRACER
void GetTLSTraceInfo();
mozilla::tasktracer::TracedTaskCommon GetTracedTask();
#endif
// If a failure is encountered, the reference is returned to the caller
static already_AddRefed<nsTimerImpl> PostTimerEvent(
already_AddRefed<nsTimerImpl> aTimerRef);
int32_t GetGeneration()
{
return mGeneration;
}
enum class CallbackType : uint8_t {
Unknown = 0,
Interface = 1,
Function = 2,
Observer = 3,
};
~nsTimerImpl();
nsresult InitCommon(uint32_t aDelay, uint32_t aType);
void ReleaseCallback()
{
// if we're the last owner of the callback object, make
// sure that we don't recurse into ReleaseCallback in case
// the callback's destructor calls Cancel() or similar.
CallbackType cbType = mCallbackType;
mCallbackType = CallbackType::Unknown;
if (cbType == CallbackType::Interface) {
NS_RELEASE(mCallback.i);
} else if (cbType == CallbackType::Observer) {
NS_RELEASE(mCallback.o);
}
}
bool IsRepeating() const
{
static_assert(TYPE_ONE_SHOT < TYPE_REPEATING_SLACK,
"invalid ordering of timer types!");
static_assert(TYPE_REPEATING_SLACK < TYPE_REPEATING_PRECISE,
"invalid ordering of timer types!");
static_assert(TYPE_REPEATING_PRECISE < TYPE_REPEATING_PRECISE_CAN_SKIP,
"invalid ordering of timer types!");
return mType >= TYPE_REPEATING_SLACK;
}
bool IsRepeatingPrecisely() const
{
return mType >= TYPE_REPEATING_PRECISE;
}
nsCOMPtr<nsIEventTarget> mEventTarget;
void* mClosure;
union CallbackUnion
{
nsTimerCallbackFunc c;
// These refcounted references are managed manually, as they are in a union
nsITimerCallback* MOZ_OWNING_REF i;
nsIObserver* MOZ_OWNING_REF o;
} mCallback;
void LogFiring(CallbackType aCallbackType, CallbackUnion aCallbackUnion);
// |Name| is a tagged union type representing one of (a) nothing, (b) a
// string, or (c) a function. mozilla::Variant doesn't naturally handle the
// "nothing" case, so we define a dummy type and value (which is unused and
// so the exact value doesn't matter) for it.
typedef const int NameNothing;
typedef const char* NameString;
typedef nsTimerNameCallbackFunc NameFunc;
typedef mozilla::Variant<NameNothing, NameString, NameFunc> Name;
static const NameNothing Nothing;
nsresult InitWithFuncCallbackCommon(nsTimerCallbackFunc aFunc,
void* aClosure,
uint32_t aDelay,
uint32_t aType,
Name aName);
// This is set by Init. It records the name (if there is one) for the timer,
// for use when logging timer firings.
Name mName;
// Some callers expect to be able to access the callback while the
// timer is firing.
nsCOMPtr<nsITimerCallback> mTimerCallbackWhileFiring;
// These members are set by Init and never reset.
CallbackType mCallbackType;
// These members are set by the initiating thread, when the timer's type is
// changed and during the period where it fires on that thread.
uint8_t mType;
bool mFiring;
// Use a bool (int) here to isolate loads and stores of these two members
// done on various threads under the protection of TimerThread::mLock, from
// loads and stores done on the initiating/type-changing/timer-firing thread
// to the above uint8_t/bool members.
bool mArmed;
bool mCanceled;
// The generation number of this timer, re-generated each time the timer is
// initialized so one-shot timers can be canceled and re-initialized by the
// arming thread without any bad race conditions.
int32_t mGeneration;
uint32_t mDelay;
TimeStamp mTimeout;
#ifdef MOZ_TASK_TRACER
mozilla::tasktracer::TracedTaskCommon mTracedTask;
#endif
TimeStamp mStart, mStart2;
static double sDeltaSum;
static double sDeltaSumSquared;
static double sDeltaNum;
};
#endif /* nsTimerImpl_h___ */