1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/threading/platform_thread.h"
10 #include "base/lazy_instance.h"
11 #include "base/logging.h"
12 #include "base/threading/platform_thread_internal_posix.h"
13 #include "base/threading/thread_id_name_manager.h"
14 #include "base/tracked_objects.h"
18 #include <sys/prctl.h>
19 #include <sys/types.h>
29 const struct sched_param kRealTimePrio
= {8};
30 const struct sched_param kResetPrio
= {0};
34 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap
[4] = {
35 {ThreadPriority::BACKGROUND
, 10},
36 {ThreadPriority::NORMAL
, 0},
37 {ThreadPriority::DISPLAY
, -6},
38 {ThreadPriority::REALTIME_AUDIO
, -10},
41 bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority
) {
43 ThreadPriority current_priority
;
44 if (priority
!= ThreadPriority::REALTIME_AUDIO
&&
45 GetCurrentThreadPriorityForPlatform(¤t_priority
) &&
46 current_priority
== ThreadPriority::REALTIME_AUDIO
) {
47 // If the pthread's round-robin scheduler is already enabled, and the new
48 // priority will use setpriority() instead, the pthread scheduler should be
49 // reset to use SCHED_OTHER so that setpriority() just works.
50 pthread_setschedparam(pthread_self(), SCHED_OTHER
, &kResetPrio
);
53 return priority
== ThreadPriority::REALTIME_AUDIO
&&
54 pthread_setschedparam(pthread_self(), SCHED_RR
, &kRealTimePrio
) == 0;
60 bool GetCurrentThreadPriorityForPlatform(ThreadPriority
* priority
) {
62 int maybe_sched_rr
= 0;
63 struct sched_param maybe_realtime_prio
= {0};
64 if (pthread_getschedparam(pthread_self(), &maybe_sched_rr
,
65 &maybe_realtime_prio
) == 0 &&
66 maybe_sched_rr
== SCHED_RR
&&
67 maybe_realtime_prio
.sched_priority
== kRealTimePrio
.sched_priority
) {
68 *priority
= ThreadPriority::REALTIME_AUDIO
;
75 } // namespace internal
78 void PlatformThread::SetName(const std::string
& name
) {
79 ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name
);
80 tracked_objects::ThreadData::InitializeThreadContext(name
);
83 // On linux we can get the thread names to show up in the debugger by setting
84 // the process name for the LWP. We don't want to do this for the main
85 // thread because that would rename the process, causing tools like killall
87 if (PlatformThread::CurrentId() == getpid())
90 // http://0pointer.de/blog/projects/name-your-threads.html
91 // Set the name for the LWP (which gets truncated to 15 characters).
92 // Note that glibc also has a 'pthread_setname_np' api, but it may not be
93 // available everywhere and it's only benefit over using prctl directly is
94 // that it can set the name of threads other than the current thread.
95 int err
= prctl(PR_SET_NAME
, name
.c_str());
96 // We expect EPERM failures in sandboxed processes, just ignore those.
97 if (err
< 0 && errno
!= EPERM
)
98 DPLOG(ERROR
) << "prctl(PR_SET_NAME)";
99 #endif // !defined(OS_NACL)
102 void InitThreading() {}
104 void InitOnThread() {}
106 void TerminateOnThread() {}
108 size_t GetDefaultThreadStackSize(const pthread_attr_t
& attributes
) {
109 #if !defined(THREAD_SANITIZER)
112 // ThreadSanitizer bloats the stack heavily. Evidence has been that the
113 // default stack size isn't enough for some browser tests.
114 return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux).