1 files changed, 84 insertions, 0 deletions
diff --git a/gfx/2d/CriticalSection.h b/gfx/2d/CriticalSection.h
new file mode 100644
index 0000000000..4ecb9d26e8
--- /dev/null
+++ b/gfx/2d/CriticalSection.h
@@ -0,0 +1,84 @@
+/* -*- 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 MOZILLA_GFX_CRITICALSECTION_H_
+#define MOZILLA_GFX_CRITICALSECTION_H_
+
+#ifdef WIN32
+#  include <windows.h>
+#else
+#  include <pthread.h>
+#  include "mozilla/DebugOnly.h"
+#endif
+
+namespace mozilla {
+namespace gfx {
+
+#ifdef WIN32
+
+class CriticalSection {
+ public:
+  CriticalSection() { ::InitializeCriticalSection(&mCriticalSection); }
+
+  ~CriticalSection() { ::DeleteCriticalSection(&mCriticalSection); }
+
+  void Enter() { ::EnterCriticalSection(&mCriticalSection); }
+
+  void Leave() { ::LeaveCriticalSection(&mCriticalSection); }
+
+ protected:
+  CRITICAL_SECTION mCriticalSection;
+};
+
+#else
+// posix
+
+class PosixCondvar;
+class CriticalSection {
+ public:
+  CriticalSection() {
+    DebugOnly<int> err = pthread_mutex_init(&mMutex, nullptr);
+    MOZ_ASSERT(!err);
+  }
+
+  ~CriticalSection() {
+    DebugOnly<int> err = pthread_mutex_destroy(&mMutex);
+    MOZ_ASSERT(!err);
+  }
+
+  void Enter() {
+    DebugOnly<int> err = pthread_mutex_lock(&mMutex);
+    MOZ_ASSERT(!err);
+  }
+
+  void Leave() {
+    DebugOnly<int> err = pthread_mutex_unlock(&mMutex);
+    MOZ_ASSERT(!err);
+  }
+
+ protected:
+  pthread_mutex_t mMutex;
+  friend class PosixCondVar;
+};
+
+#endif
+
+/// RAII helper.
+struct CriticalSectionAutoEnter final {
+  explicit CriticalSectionAutoEnter(CriticalSection* aSection)
+      : mSection(aSection) {
+    mSection->Enter();
+  }
+  ~CriticalSectionAutoEnter() { mSection->Leave(); }
+
+ protected:
+  CriticalSection* mSection;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif