1 files changed, 83 insertions, 0 deletions
diff --git a/ipc/glue/CrossProcessSemaphore_windows.cpp b/ipc/glue/CrossProcessSemaphore_windows.cpp
new file mode 100644
index 0000000000..70644b7d51
--- /dev/null
+++ b/ipc/glue/CrossProcessSemaphore_windows.cpp
@@ -0,0 +1,83 @@
+/* -*- 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/. */
+
+#include <windows.h>
+
+#include "base/process_util.h"
+#include "CrossProcessSemaphore.h"
+#include "nsDebug.h"
+#include "nsISupportsImpl.h"
+#include "ProtocolUtils.h"
+
+using base::GetCurrentProcessHandle;
+using base::ProcessHandle;
+
+namespace mozilla {
+
+/* static */
+CrossProcessSemaphore* CrossProcessSemaphore::Create(const char*,
+                                                     uint32_t aInitialValue) {
+  // We explicitly share this using DuplicateHandle, we do -not- want this to
+  // be inherited by child processes by default! So no security attributes are
+  // given.
+  HANDLE semaphore =
+      ::CreateSemaphoreA(nullptr, aInitialValue, 0x7fffffff, nullptr);
+  if (!semaphore) {
+    return nullptr;
+  }
+  return new CrossProcessSemaphore(semaphore);
+}
+
+/* static */
+CrossProcessSemaphore* CrossProcessSemaphore::Create(
+    CrossProcessSemaphoreHandle aHandle) {
+  DWORD flags;
+  if (!::GetHandleInformation(aHandle.get(), &flags)) {
+    return nullptr;
+  }
+
+  return new CrossProcessSemaphore(aHandle.release());
+}
+
+CrossProcessSemaphore::CrossProcessSemaphore(HANDLE aSemaphore)
+    : mSemaphore(aSemaphore) {
+  MOZ_COUNT_CTOR(CrossProcessSemaphore);
+}
+
+CrossProcessSemaphore::~CrossProcessSemaphore() {
+  MOZ_ASSERT(mSemaphore, "Improper construction of semaphore or double free.");
+  ::CloseHandle(mSemaphore);
+  MOZ_COUNT_DTOR(CrossProcessSemaphore);
+}
+
+bool CrossProcessSemaphore::Wait(const Maybe<TimeDuration>& aWaitTime) {
+  MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
+  HRESULT hr = ::WaitForSingleObject(
+      mSemaphore, aWaitTime.isSome() ? aWaitTime->ToMilliseconds() : INFINITE);
+  return hr == WAIT_OBJECT_0;
+}
+
+void CrossProcessSemaphore::Signal() {
+  MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
+  ::ReleaseSemaphore(mSemaphore, 1, nullptr);
+}
+
+CrossProcessSemaphoreHandle CrossProcessSemaphore::CloneHandle() {
+  HANDLE newHandle;
+  bool succeeded =
+      ::DuplicateHandle(GetCurrentProcess(), mSemaphore, GetCurrentProcess(),
+                        &newHandle, 0, false, DUPLICATE_SAME_ACCESS);
+
+  if (!succeeded) {
+    return nullptr;
+  }
+
+  return UniqueFileHandle(newHandle);
+}
+
+void CrossProcessSemaphore::CloseHandle() {}
+
+}  // namespace mozilla