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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// System independant wrapper for spawning threads
// Note: the spawned thread will loop over the callback function until stopped.
// Note: The callback function is expected to return every 2 seconds or more
// often.
#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_
#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_
#include "webrtc/common_types.h"
#include "webrtc/typedefs.h"
namespace webrtc {
// Object that will be passed by the spawned thread when it enters the callback
// function.
#define ThreadObj void*
// Callback function that the spawned thread will enter once spawned.
// A return value of false is interpreted as that the function has no
// more work to do and that the thread can be released.
typedef bool(*ThreadRunFunction)(ThreadObj);
enum ThreadPriority {
kLowPriority = 1,
kNormalPriority = 2,
kHighPriority = 3,
kHighestPriority = 4,
kRealtimePriority = 5
};
class ThreadWrapper {
public:
enum {kThreadMaxNameLength = 64};
virtual ~ThreadWrapper() {};
// Factory method. Constructor disabled.
//
// func Pointer to a, by user, specified callback function.
// obj Object associated with the thread. Passed in the callback
// function.
// prio Thread priority. May require root/admin rights.
// thread_name NULL terminated thread name, will be visable in the Windows
// debugger.
static ThreadWrapper* CreateThread(ThreadRunFunction func,
ThreadObj obj,
ThreadPriority prio = kNormalPriority,
const char* thread_name = 0);
// Get the current thread's kernel thread ID.
static uint32_t GetThreadId();
// Non blocking termination of the spawned thread. Note that it is not safe
// to delete this class until the spawned thread has been reclaimed.
virtual void SetNotAlive() = 0;
// Tries to spawns a thread and returns true if that was successful.
// Additionally, it tries to set thread priority according to the priority
// from when CreateThread was called. However, failure to set priority will
// not result in a false return value.
// TODO(henrike): add a function for polling whether priority was set or
// not.
virtual bool Start(unsigned int& id) = 0;
// Sets the threads CPU affinity. CPUs are listed 0 - (number of CPUs - 1).
// The numbers in processor_numbers specify which CPUs are allowed to run the
// thread. processor_numbers should not contain any duplicates and elements
// should be lower than (number of CPUs - 1). amount_of_processors should be
// equal to the number of processors listed in processor_numbers.
virtual bool SetAffinity(const int* processor_numbers,
const unsigned int amount_of_processors);
// Stops the spawned thread and waits for it to be reclaimed with a timeout
// of two seconds. Will return false if the thread was not reclaimed.
// Multiple tries to Stop are allowed (e.g. to wait longer than 2 seconds).
// It's ok to call Stop() even if the spawned thread has been reclaimed.
virtual bool Stop() = 0;
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_THREAD_WRAPPER_H_
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