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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/platform_thread.h"
#include <errno.h>
#include <sched.h>
#if defined(OS_MACOSX)
#include <mach/mach.h>
#elif defined(OS_NETBSD)
#include <lwp.h>
#elif defined(OS_LINUX)
#include <sys/syscall.h>
#include <sys/prctl.h>
#endif
#if !defined(OS_MACOSX)
#include <unistd.h>
#endif
#if defined(OS_BSD) && !defined(OS_NETBSD) && !defined(__GLIBC__)
#include <pthread_np.h>
#endif
#if defined(OS_MACOSX)
namespace base {
void InitThreading();
} // namespace
#endif
static void* ThreadFunc(void* closure) {
PlatformThread::Delegate* delegate =
static_cast<PlatformThread::Delegate*>(closure);
delegate->ThreadMain();
return NULL;
}
// static
PlatformThreadId PlatformThread::CurrentId() {
// Pthreads doesn't have the concept of a thread ID, so we have to reach down
// into the kernel.
#if defined(OS_MACOSX)
mach_port_t port = mach_thread_self();
mach_port_deallocate(mach_task_self(), port);
return port;
#elif defined(OS_LINUX)
return syscall(__NR_gettid);
#elif defined(OS_OPENBSD) || defined(__GLIBC__)
return (intptr_t) (pthread_self());
#elif defined(OS_NETBSD)
return _lwp_self();
#elif defined(OS_DRAGONFLY)
return lwp_gettid();
#elif defined(OS_FREEBSD)
return pthread_getthreadid_np();
#endif
}
// static
void PlatformThread::YieldCurrentThread() {
sched_yield();
}
// static
void PlatformThread::Sleep(int duration_ms) {
struct timespec sleep_time, remaining;
// Contains the portion of duration_ms >= 1 sec.
sleep_time.tv_sec = duration_ms / 1000;
duration_ms -= sleep_time.tv_sec * 1000;
// Contains the portion of duration_ms < 1 sec.
sleep_time.tv_nsec = duration_ms * 1000 * 1000; // nanoseconds.
while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
sleep_time = remaining;
}
#ifndef OS_MACOSX
// Mac is implemented in platform_thread_mac.mm.
// static
void PlatformThread::SetName(const char* name) {
// On linux we can get the thread names to show up in the debugger by setting
// the process name for the LWP. We don't want to do this for the main
// thread because that would rename the process, causing tools like killall
// to stop working.
if (PlatformThread::CurrentId() == getpid())
return;
// http://0pointer.de/blog/projects/name-your-threads.html
// Set the name for the LWP (which gets truncated to 15 characters).
// Note that glibc also has a 'pthread_setname_np' api, but it may not be
// available everywhere and it's only benefit over using prctl directly is
// that it can set the name of threads other than the current thread.
#if defined(OS_LINUX)
prctl(PR_SET_NAME, reinterpret_cast<uintptr_t>(name), 0, 0, 0);
#elif defined(OS_NETBSD)
pthread_setname_np(pthread_self(), "%s", (void *)name);
#elif defined(OS_BSD) && !defined(__GLIBC__)
pthread_set_name_np(pthread_self(), name);
#else
#endif
}
#endif // !OS_MACOSX
namespace {
bool CreateThread(size_t stack_size, bool joinable,
PlatformThread::Delegate* delegate,
PlatformThreadHandle* thread_handle) {
#if defined(OS_MACOSX)
base::InitThreading();
#endif // OS_MACOSX
bool success = false;
pthread_attr_t attributes;
pthread_attr_init(&attributes);
// Pthreads are joinable by default, so only specify the detached attribute if
// the thread should be non-joinable.
if (!joinable) {
pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_DETACHED);
}
if (stack_size > 0)
pthread_attr_setstacksize(&attributes, stack_size);
success = !pthread_create(thread_handle, &attributes, ThreadFunc, delegate);
pthread_attr_destroy(&attributes);
return success;
}
} // anonymous namespace
// static
bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
PlatformThreadHandle* thread_handle) {
return CreateThread(stack_size, true /* joinable thread */,
delegate, thread_handle);
}
// static
bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
PlatformThreadHandle unused;
bool result = CreateThread(stack_size, false /* non-joinable thread */,
delegate, &unused);
return result;
}
// static
void PlatformThread::Join(PlatformThreadHandle thread_handle) {
pthread_join(thread_handle, NULL);
}
|
