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-rw-r--r--widget/cocoa/WidgetTraceEvent.mm85
1 files changed, 85 insertions, 0 deletions
diff --git a/widget/cocoa/WidgetTraceEvent.mm b/widget/cocoa/WidgetTraceEvent.mm
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+++ b/widget/cocoa/WidgetTraceEvent.mm
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+/* 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 <Cocoa/Cocoa.h>
+#include "CustomCocoaEvents.h"
+#include <Foundation/NSAutoreleasePool.h>
+#include <mozilla/CondVar.h>
+#include <mozilla/Mutex.h>
+#include "mozilla/WidgetTraceEvent.h"
+
+using mozilla::CondVar;
+using mozilla::Mutex;
+using mozilla::MutexAutoLock;
+
+namespace {
+
+Mutex* sMutex = NULL;
+CondVar* sCondVar = NULL;
+bool sTracerProcessed = false;
+
+} // namespace
+
+namespace mozilla {
+
+bool InitWidgetTracing()
+{
+ sMutex = new Mutex("Event tracer thread mutex");
+ sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
+ return sMutex && sCondVar;
+}
+
+void CleanUpWidgetTracing()
+{
+ delete sMutex;
+ delete sCondVar;
+ sMutex = NULL;
+ sCondVar = NULL;
+}
+
+// This function is called from the main (UI) thread.
+void SignalTracerThread()
+{
+ if (!sMutex || !sCondVar)
+ return;
+ MutexAutoLock lock(*sMutex);
+ if (!sTracerProcessed) {
+ sTracerProcessed = true;
+ sCondVar->Notify();
+ }
+}
+
+// This function is called from the background tracer thread.
+bool FireAndWaitForTracerEvent()
+{
+ MOZ_ASSERT(sMutex && sCondVar, "Tracing not initialized!");
+ NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+ MutexAutoLock lock(*sMutex);
+ if (sTracerProcessed) {
+ // Things are out of sync. This is likely because we're in
+ // the middle of shutting down. Just return false and hope the
+ // tracer thread is quitting anyway.
+ return false;
+ }
+
+ // Post an application-defined event to the main thread's event queue
+ // and wait for it to get processed.
+ [NSApp postEvent:[NSEvent otherEventWithType:NSApplicationDefined
+ location:NSMakePoint(0,0)
+ modifierFlags:0
+ timestamp:0
+ windowNumber:0
+ context:NULL
+ subtype:kEventSubtypeTrace
+ data1:0
+ data2:0]
+ atStart:NO];
+ while (!sTracerProcessed)
+ sCondVar->Wait();
+ sTracerProcessed = false;
+ [pool release];
+ return true;
+}
+
+} // namespace mozilla