hal/HalTypes.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef mozilla_hal_Types_h
   7 #define mozilla_hal_Types_h
   8
   9 #include "ipc/EnumSerializer.h"
  10 #include "mozilla/Observer.h"
  11
  12 namespace mozilla {
  13 namespace hal {
  14
  15 /**
  16  * These constants specify special values for content process IDs.  You can get
  17  * a content process ID by calling ContentChild::GetID() or
  18  * ContentParent::GetChildID().
  19  */
  20 const uint64_t CONTENT_PROCESS_ID_UNKNOWN = uint64_t(-1);
  21 const uint64_t CONTENT_PROCESS_ID_MAIN = 0;
  22
  23 // Note that we rely on the order of this enum's entries.  Higher priorities
  24 // should have larger int values.
  25 enum ProcessPriority {
  26   PROCESS_PRIORITY_UNKNOWN = -1,
  27   PROCESS_PRIORITY_BACKGROUND,
  28   PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE,
  29   PROCESS_PRIORITY_FOREGROUND_KEYBOARD,
  30   // The special class for the preallocated process, high memory priority but
  31   // low CPU priority.
  32   PROCESS_PRIORITY_PREALLOC,
  33   // Any priority greater than or equal to FOREGROUND is considered
  34   // "foreground" for the purposes of priority testing, for example
  35   // CurrentProcessIsForeground().
  36   PROCESS_PRIORITY_FOREGROUND,
  37   PROCESS_PRIORITY_FOREGROUND_HIGH,
  38   PROCESS_PRIORITY_PARENT_PROCESS,
  39   NUM_PROCESS_PRIORITY
  40 };
  41
  42 /**
  43  * Convert a ProcessPriority enum value to a string.  The strings returned by
  44  * this function are statically allocated; do not attempt to free one!
  45  *
  46  * If you pass an unknown process priority, we fatally assert in debug
  47  * builds and otherwise return "???".
  48  */
  49 const char* ProcessPriorityToString(ProcessPriority aPriority);
  50
  51 /**
  52  * Used by ModifyWakeLock
  53  */
  54 enum WakeLockControl {
  55   WAKE_LOCK_REMOVE_ONE = -1,
  56   WAKE_LOCK_NO_CHANGE = 0,
  57   WAKE_LOCK_ADD_ONE = 1,
  58   NUM_WAKE_LOCK
  59 };
  60
  61 }  // namespace hal
  62 }  // namespace mozilla
  63
  64 namespace IPC {
  65
  66 /**
  67  * WakeLockControl serializer.
  68  */
  69 template <>
  70 struct ParamTraits<mozilla::hal::WakeLockControl>
  71     : public ContiguousEnumSerializer<mozilla::hal::WakeLockControl,
  72                                       mozilla::hal::WAKE_LOCK_REMOVE_ONE,
  73                                       mozilla::hal::NUM_WAKE_LOCK> {};
  74
  75 template <>
  76 struct ParamTraits<mozilla::hal::ProcessPriority>
  77     : public ContiguousEnumSerializer<mozilla::hal::ProcessPriority,
  78                                       mozilla::hal::PROCESS_PRIORITY_UNKNOWN,
  79                                       mozilla::hal::NUM_PROCESS_PRIORITY> {};
  80
  81 }  // namespace IPC
  82
  83 #endif  // mozilla_hal_Types_h