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      1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/power_save_blocker.h"
      6 
      7 #include <IOKit/pwr_mgt/IOPMLib.h>
      8 
      9 #include "content/browser/browser_thread.h"
     10 
     11 // Run on the UI thread only.
     12 void PowerSaveBlocker::ApplyBlock(bool blocking) {
     13   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     14 
     15   // Block just idle sleep; allow display sleep.
     16   // See QA1340 <http://developer.apple.com/library/mac/#qa/qa2004/qa1340.html>
     17   // for more details.
     18 
     19   static IOPMAssertionID sleep_assertion = kIOPMNullAssertionID;
     20   IOReturn result;
     21   if (blocking) {
     22     DCHECK_EQ(sleep_assertion, kIOPMNullAssertionID);
     23     result = IOPMAssertionCreate(
     24         kIOPMAssertionTypeNoIdleSleep,
     25         kIOPMAssertionLevelOn,
     26         &sleep_assertion);
     27   } else {
     28     DCHECK_NE(sleep_assertion, kIOPMNullAssertionID);
     29     result = IOPMAssertionRelease(sleep_assertion);
     30     sleep_assertion = kIOPMNullAssertionID;
     31   }
     32 
     33   if (result != kIOReturnSuccess) {
     34     NOTREACHED();
     35   }
     36 }
     37