1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
#include "WebGLContextLossHandler.h"
#include "mozilla/DebugOnly.h"
#include "nsISupportsImpl.h"
#include "nsITimer.h"
#include "nsThreadUtils.h"
#include "WebGLContext.h"
namespace mozilla {
class WatchdogTimerEvent final : public nsITimerCallback
{
const WeakPtr<WebGLContextLossHandler> mHandler;
public:
NS_DECL_ISUPPORTS
explicit WatchdogTimerEvent(WebGLContextLossHandler* handler)
: mHandler(handler)
{ }
private:
virtual ~WatchdogTimerEvent() { }
NS_IMETHOD Notify(nsITimer*) override {
if (mHandler) {
mHandler->TimerCallback();
}
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(WatchdogTimerEvent, nsITimerCallback, nsISupports)
////////////////////////////////////////
WebGLContextLossHandler::WebGLContextLossHandler(WebGLContext* webgl)
: mWebGL(webgl)
, mTimer(do_CreateInstance(NS_TIMER_CONTRACTID))
, mTimerPending(false)
, mShouldRunTimerAgain(false)
#ifdef DEBUG
, mThread(NS_GetCurrentThread())
#endif
{
MOZ_ASSERT(mThread);
}
WebGLContextLossHandler::~WebGLContextLossHandler()
{
// NS_GetCurrentThread() returns null during shutdown.
const DebugOnly<nsIThread*> callingThread = NS_GetCurrentThread();
MOZ_ASSERT(callingThread == mThread || !callingThread);
}
////////////////////
void
WebGLContextLossHandler::RunTimer()
{
MOZ_ASSERT(NS_GetCurrentThread() == mThread);
// If the timer was already running, don't restart it here. Instead,
// wait until the previous call is done, then fire it one more time.
// This is also an optimization to prevent unnecessary
// cross-communication between threads.
if (mTimerPending) {
mShouldRunTimerAgain = true;
return;
}
const RefPtr<WatchdogTimerEvent> event = new WatchdogTimerEvent(this);
const uint32_t kDelayMS = 1000;
mTimer->InitWithCallback(event, kDelayMS, nsITimer::TYPE_ONE_SHOT);
mTimerPending = true;
}
////////////////////
void
WebGLContextLossHandler::TimerCallback()
{
MOZ_ASSERT(NS_GetCurrentThread() == mThread);
mTimerPending = false;
const bool runOnceMore = mShouldRunTimerAgain;
mShouldRunTimerAgain = false;
mWebGL->UpdateContextLossStatus();
if (runOnceMore && !mTimerPending) {
RunTimer();
}
}
} // namespace mozilla
|
