1 files changed, 64 insertions, 0 deletions
diff --git a/content/browser/power_save_blocker_mac.cc b/content/browser/power_save_blocker_mac.cc
new file mode 100644
index 0000000..9acd130
--- /dev/null
+++ b/content/browser/power_save_blocker_mac.cc
@@ -0,0 +1,64 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/power_save_blocker.h"
+
+#include <IOKit/pwr_mgt/IOPMLib.h>
+
+#include "base/threading/platform_thread.h"
+#include "base/threading/thread.h"
+#include "content/browser/browser_thread.h"
+
+namespace {
+
+// Power management cannot be done on the UI thread. IOPMAssertionCreate does a
+// synchronous MIG call to configd, so if it is called on the main thread the UI
+// is at the mercy of another process. See http://crbug.com/79559 and
+// http://www.opensource.apple.com/source/IOKitUser/IOKitUser-514.16.31/pwr_mgt.subproj/IOPMLibPrivate.c .
+base::Thread* g_power_thread;
+IOPMAssertionID g_power_assertion;
+
+void CreateSleepAssertion() {
+  DCHECK_EQ(base::PlatformThread::CurrentId(), g_power_thread->thread_id());
+  IOReturn result;
+  DCHECK_EQ(g_power_assertion, kIOPMNullAssertionID);
+
+  // Block just idle sleep; allow display sleep.
+  // See QA1340 <http://developer.apple.com/library/mac/#qa/qa2004/qa1340.html>
+  // for more details.
+  result = IOPMAssertionCreate(kIOPMAssertionTypeNoIdleSleep,
+                               kIOPMAssertionLevelOn,
+                               &g_power_assertion);
+  LOG_IF(ERROR, result != kIOReturnSuccess)
+      << "IOPMAssertionCreate: " << result;
+}
+
+void ReleaseSleepAssertion() {
+  DCHECK_EQ(base::PlatformThread::CurrentId(), g_power_thread->thread_id());
+  IOReturn result;
+  DCHECK_NE(g_power_assertion, kIOPMNullAssertionID);
+  result = IOPMAssertionRelease(g_power_assertion);
+  g_power_assertion = kIOPMNullAssertionID;
+  LOG_IF(ERROR, result != kIOReturnSuccess)
+      << "IOPMAssertionRelease: " << result;
+}
+
+}  // namespace
+
+// Called only from UI thread.
+void PowerSaveBlocker::ApplyBlock(bool blocking) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (!g_power_thread) {
+    g_power_assertion = kIOPMNullAssertionID;
+    g_power_thread = new base::Thread("PowerSaveBlocker");
+    g_power_thread->Start();
+  }
+
+  MessageLoop* loop = g_power_thread->message_loop();
+  if (blocking)
+    loop->PostTask(FROM_HERE, NewRunnableFunction(CreateSleepAssertion));
+  else
+    loop->PostTask(FROM_HERE, NewRunnableFunction(ReleaseSleepAssertion));
+}