1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* Copyright (c) 2015 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.
*/
#ifndef WEBRTC_BASE_PLATFORM_THREAD_H_
#define WEBRTC_BASE_PLATFORM_THREAD_H_
#include <string>
#include "webrtc/base/constructormagic.h"
#include "webrtc/base/event.h"
#include "webrtc/base/platform_thread_types.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/base/thread_checker.h"
namespace rtc {
PlatformThreadId CurrentThreadId();
PlatformThreadRef CurrentThreadRef();
// Compares two thread identifiers for equality.
bool IsThreadRefEqual(const PlatformThreadRef& a, const PlatformThreadRef& b);
// Sets the current thread name.
void SetCurrentThreadName(const char* name);
// 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)(void*);
enum ThreadPriority {
#ifdef WEBRTC_WIN
kLowPriority = THREAD_PRIORITY_BELOW_NORMAL,
kNormalPriority = THREAD_PRIORITY_NORMAL,
kHighPriority = THREAD_PRIORITY_ABOVE_NORMAL,
kHighestPriority = THREAD_PRIORITY_HIGHEST,
kRealtimePriority = THREAD_PRIORITY_TIME_CRITICAL
#else
kLowPriority = 1,
kNormalPriority = 2,
kHighPriority = 3,
kHighestPriority = 4,
kRealtimePriority = 5
#endif
};
// Represents a simple worker thread. The implementation must be assumed
// to be single threaded, meaning that all methods of the class, must be
// called from the same thread, including instantiation.
class PlatformThread {
public:
PlatformThread(ThreadRunFunction func, void* obj, const char* thread_name);
virtual ~PlatformThread();
// Spawns a thread and tries to set thread priority according to the priority
// from when CreateThread was called.
void Start();
bool IsRunning() const;
// Stops (joins) the spawned thread.
void Stop();
// Set the priority of the thread. Must be called when thread is running.
bool SetPriority(ThreadPriority priority);
private:
void Run();
ThreadRunFunction const run_function_;
void* const obj_;
// TODO(pbos): Make sure call sites use string literals and update to a const
// char* instead of a std::string.
const std::string name_;
rtc::ThreadChecker thread_checker_;
#if defined(WEBRTC_WIN)
static DWORD WINAPI StartThread(void* param);
bool stop_;
HANDLE thread_;
#else
static void* StartThread(void* param);
rtc::Event stop_event_;
pthread_t thread_;
#endif // defined(WEBRTC_WIN)
RTC_DISALLOW_COPY_AND_ASSIGN(PlatformThread);
};
} // namespace rtc
#endif // WEBRTC_BASE_PLATFORM_THREAD_H_
|
