Mac: Split SystemMonitor initialization so it's not blocked by the Sandbox.

base/system_monitor/system_monitor_mac.mm

 // 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.
 
 // Implementation based on sample code from
 // http://developer.apple.com/library/mac/#qa/qa1340/_index.html.
 
 #include "base/system_monitor/system_monitor.h"
 
 #include <IOKit/pwr_mgt/IOPMLib.h>
 #include <IOKit/IOMessage.h>
 
 namespace base {
 
 namespace {
 
 io_connect_t g_system_power_io_port = 0;
+IONotificationPortRef g_notification_port_ref = 0;
+io_object_t g_notifier_object = 0;
 
-void SystemPowerEventCallback(void* system_monitor,
+void SystemPowerEventCallback(void*,
                               io_service_t service,
                               natural_t message_type,
                               void* message_argument) {
-  DCHECK(system_monitor);
-  SystemMonitor* sys_monitor = reinterpret_cast<SystemMonitor*>(system_monitor);
+  SystemMonitor* sys_monitor = SystemMonitor::Get();
+  DCHECK(sys_monitor);
   switch (message_type) {
     case kIOMessageSystemWillSleep:
       sys_monitor->ProcessPowerMessage(SystemMonitor::SUSPEND_EVENT);
       IOAllowPowerChange(g_system_power_io_port,
           reinterpret_cast<int>(message_argument));
       break;
 
     case kIOMessageSystemWillPowerOn:
       sys_monitor->ProcessPowerMessage(SystemMonitor::RESUME_EVENT);
       break;
   }
 }
 
 }  // namespace
 
-void SystemMonitor::PlatformInit() {
+// The reason we can't include this code in the constructor is because
+// PlatformInit() requires an active runloop and the IO port needs to be
+// allocated at sandbox initialization time, before there's a runloop.
+// See crbug.com/83783 .
+
+// static
+void SystemMonitor::AllocateSystemIOPorts() {
   DCHECK_EQ(g_system_power_io_port, 0u);
 
   // Notification port allocated by IORegisterForSystemPower.
 
   g_system_power_io_port = IORegisterForSystemPower(
-      this, &notification_port_ref_, SystemPowerEventCallback,
-      &notifier_object_);
+      NULL, &g_notification_port_ref, SystemPowerEventCallback,
+      &g_notifier_object);
+
+  DCHECK_NE(g_system_power_io_port, 0u);
+}
+
+void SystemMonitor::PlatformInit() {
+  // Need to call AllocateSystemIOPorts() before constructing a SystemMonitor
+  // object.
   DCHECK_NE(g_system_power_io_port, 0u);
   if (g_system_power_io_port == 0)
     return;
 
   // Add the notification port to the application runloop
-  CFRunLoopAddSource(CFRunLoopGetCurrent(),
-                     IONotificationPortGetRunLoopSource(notification_port_ref_),
-                     kCFRunLoopCommonModes);
+  CFRunLoopAddSource(
+      CFRunLoopGetCurrent(),
+      IONotificationPortGetRunLoopSource(g_notification_port_ref),
+      kCFRunLoopCommonModes);
 }
 
 void SystemMonitor::PlatformDestroy() {
   DCHECK_NE(g_system_power_io_port, 0u);
   if (g_system_power_io_port == 0)
     return;
 
   // Remove the sleep notification port from the application runloop
   CFRunLoopRemoveSource(
       CFRunLoopGetCurrent(),
-      IONotificationPortGetRunLoopSource(notification_port_ref_),
+      IONotificationPortGetRunLoopSource(g_notification_port_ref),
       kCFRunLoopCommonModes);
 
   // Deregister for system sleep notifications
-  IODeregisterForSystemPower(&notifier_object_);
+  IODeregisterForSystemPower(&g_notifier_object);
 
   // IORegisterForSystemPower implicitly opens the Root Power Domain IOService,
   // so we close it here.
   IOServiceClose(g_system_power_io_port);
 
   g_system_power_io_port = 0;
 
   // Destroy the notification port allocated by IORegisterForSystemPower.
-  IONotificationPortDestroy(notification_port_ref_);
+  IONotificationPortDestroy(g_notification_port_ref);
 }
 
 }  // namespace base