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-rw-r--r--widget/gtk/WidgetTraceEvent.cpp68
1 files changed, 68 insertions, 0 deletions
diff --git a/widget/gtk/WidgetTraceEvent.cpp b/widget/gtk/WidgetTraceEvent.cpp
new file mode 100644
index 0000000000..161e5302cc
--- /dev/null
+++ b/widget/gtk/WidgetTraceEvent.cpp
@@ -0,0 +1,68 @@
+/* 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 "mozilla/WidgetTraceEvent.h"
+
+#include <glib.h>
+#include <mozilla/CondVar.h>
+#include <mozilla/Mutex.h>
+#include <stdio.h>
+
+using mozilla::CondVar;
+using mozilla::Mutex;
+using mozilla::MutexAutoLock;
+
+namespace {
+
+Mutex* sMutex = nullptr;
+CondVar* sCondVar = nullptr;
+bool sTracerProcessed = false;
+
+// This function is called from the main (UI) thread.
+gboolean TracerCallback(gpointer data) {
+ mozilla::SignalTracerThread();
+ return FALSE;
+}
+
+} // namespace
+
+namespace mozilla {
+
+bool InitWidgetTracing() {
+ sMutex = new Mutex("Event tracer thread mutex");
+ sCondVar = new CondVar(*sMutex, "Event tracer thread condvar");
+ return true;
+}
+
+void CleanUpWidgetTracing() {
+ delete sMutex;
+ delete sCondVar;
+ sMutex = nullptr;
+ sCondVar = nullptr;
+}
+
+// This function is called from the background tracer thread.
+bool FireAndWaitForTracerEvent() {
+ MOZ_ASSERT(sMutex && sCondVar, "Tracing not initialized!");
+
+ // Send a default-priority idle event through the
+ // event loop, and wait for it to finish.
+ MutexAutoLock lock(*sMutex);
+ MOZ_ASSERT(!sTracerProcessed, "Tracer synchronization state is wrong");
+ g_idle_add_full(G_PRIORITY_DEFAULT, TracerCallback, nullptr, nullptr);
+ while (!sTracerProcessed) sCondVar->Wait();
+ sTracerProcessed = false;
+ return true;
+}
+
+void SignalTracerThread() {
+ if (!sMutex || !sCondVar) return;
+ MutexAutoLock lock(*sMutex);
+ if (!sTracerProcessed) {
+ sTracerProcessed = true;
+ sCondVar->Notify();
+ }
+}
+
+} // namespace mozilla