1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/cocoa/WidgetTraceEvent.mm Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include <Cocoa/Cocoa.h>
1.9 +#include "CustomCocoaEvents.h"
1.10 +#include <Foundation/NSAutoreleasePool.h>
1.11 +#include <mozilla/CondVar.h>
1.12 +#include <mozilla/Mutex.h>
1.13 +#include "mozilla/WidgetTraceEvent.h"
1.14 +
1.15 +using mozilla::CondVar;
1.16 +using mozilla::Mutex;
1.17 +using mozilla::MutexAutoLock;
1.18 +
1.19 +namespace {
1.20 +
1.21 +Mutex* sMutex = NULL;
1.22 +CondVar* sCondVar = NULL;
1.23 +bool sTracerProcessed = false;
1.24 +
1.25 +}
1.26 +
1.27 +namespace mozilla {
1.28 +
1.29 +bool InitWidgetTracing()
1.30 +{
1.31 + sMutex = new Mutex("Event tracer thread mutex");
1.32 + sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
1.33 + return sMutex && sCondVar;
1.34 +}
1.35 +
1.36 +void CleanUpWidgetTracing()
1.37 +{
1.38 + delete sMutex;
1.39 + delete sCondVar;
1.40 + sMutex = NULL;
1.41 + sCondVar = NULL;
1.42 +}
1.43 +
1.44 +// This function is called from the main (UI) thread.
1.45 +void SignalTracerThread()
1.46 +{
1.47 + if (!sMutex || !sCondVar)
1.48 + return;
1.49 + MutexAutoLock lock(*sMutex);
1.50 + if (!sTracerProcessed) {
1.51 + sTracerProcessed = true;
1.52 + sCondVar->Notify();
1.53 + }
1.54 +}
1.55 +
1.56 +// This function is called from the background tracer thread.
1.57 +bool FireAndWaitForTracerEvent()
1.58 +{
1.59 + NS_ABORT_IF_FALSE(sMutex && sCondVar, "Tracing not initialized!");
1.60 + NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
1.61 + MutexAutoLock lock(*sMutex);
1.62 + if (sTracerProcessed) {
1.63 + // Things are out of sync. This is likely because we're in
1.64 + // the middle of shutting down. Just return false and hope the
1.65 + // tracer thread is quitting anyway.
1.66 + return false;
1.67 + }
1.68 +
1.69 + // Post an application-defined event to the main thread's event queue
1.70 + // and wait for it to get processed.
1.71 + [NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
1.72 + location:NSMakePoint(0,0)
1.73 + modifierFlags:0
1.74 + timestamp:0
1.75 + windowNumber:0
1.76 + context:NULL
1.77 + subtype:kEventSubtypeTrace
1.78 + data1:0
1.79 + data2:0]
1.80 + atStart:NO];
1.81 + while (!sTracerProcessed)
1.82 + sCondVar->Wait();
1.83 + sTracerProcessed = false;
1.84 + [pool release];
1.85 + return true;
1.86 +}
1.87 +
1.88 +} // namespace mozilla
