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