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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 */
#ifndef mozilla_hal_Types_h
#define mozilla_hal_Types_h
#include "ipc/EnumSerializer.h"
#include "mozilla/BitSet.h"
#include "mozilla/Observer.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
namespace hal {
* These constants specify special values for content process IDs. You can get
* a content process ID by calling ContentChild::GetID() or
* ContentParent::GetChildID().
const uint64_t CONTENT_PROCESS_ID_UNKNOWN = uint64_t(-1);
const uint64_t CONTENT_PROCESS_ID_MAIN = 0;
// Note that we rely on the order of this enum's entries. Higher priorities
// should have larger int values.
enum ProcessPriority {
// The special class for the preallocated process, high memory priority but
// low CPU priority.
// Any priority greater than or equal to FOREGROUND is considered
// "foreground" for the purposes of priority testing, for example
// CurrentProcessIsForeground().
* Convert a ProcessPriority enum value to a string. The strings returned by
* this function are statically allocated; do not attempt to free one!
* If you pass an unknown process priority, we fatally assert in debug
* builds and otherwise return "???".
const char* ProcessPriorityToString(ProcessPriority aPriority);
* Used by ModifyWakeLock
enum WakeLockControl {
* Represents a workload shared by a group of threads that should be completed
* in a target duration each cycle.
* This is created using hal::CreatePerformanceHintSession(). Each cycle, the
* actual work duration should be reported using ReportActualWorkDuration(). The
* system can then adjust the scheduling accordingly in order to achieve the
* target.
class PerformanceHintSession {
virtual ~PerformanceHintSession() = default;
// Updates the session's target work duration for each cycle.
virtual void UpdateTargetWorkDuration(TimeDuration aDuration) = 0;
// Reports the session's actual work duration for a cycle.
virtual void ReportActualWorkDuration(TimeDuration aDuration) = 0;
* Categorizes the CPUs on the system in to big, medium, and little classes.
* A set bit in each bitset indicates that the CPU of that index belongs to that
* class. If the CPUs are fully homogeneous they are all categorized as big. If
* there are only 2 classes, they are categorized as either big or little.
* Finally, if there are >= 3 classes, the remainder will be categorized as
* medium.
* If there are more than MAX_CPUS present we are unable to represent this
* information.
struct HeterogeneousCpuInfo {
// We use a max of 32 because this was initially implemented only for Android
// where we are unlikely to need more CPUs than that, and it simplifies
// dealing with cpu_set_t as CPU_SETSIZE is 32 on 32-bit Android.
// If there are more than 32 CPU cores, the implementation should try to fill
// first mBigCpus before adding anything to mMediumCpus or mLittleCpus.
static const size_t MAX_CPUS = 32;
size_t mTotalNumCpus;
mozilla::BitSet<MAX_CPUS> mLittleCpus;
mozilla::BitSet<MAX_CPUS> mMediumCpus;
mozilla::BitSet<MAX_CPUS> mBigCpus;
} // namespace hal
} // namespace mozilla
namespace IPC {
* WakeLockControl serializer.
template <>
struct ParamTraits<mozilla::hal::WakeLockControl>
: public ContiguousEnumSerializer<mozilla::hal::WakeLockControl,
mozilla::hal::NUM_WAKE_LOCK> {};
template <>
struct ParamTraits<mozilla::hal::ProcessPriority>
: public ContiguousEnumSerializer<mozilla::hal::ProcessPriority,
mozilla::hal::NUM_PROCESS_PRIORITY> {};
} // namespace IPC
#endif // mozilla_hal_Types_h