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/memory/scoped_ptr.h"
13 #include "base/safe_strerror_posix.h"
14 #include "base/threading/thread_id_name_manager.h"
15 #include "base/threading/thread_restrictions.h"
16 #include "base/tracked_objects.h"
19 #include <sys/prctl.h>
20 #include <sys/resource.h>
21 #include <sys/syscall.h>
31 int ThreadNiceValue(ThreadPriority priority
) {
33 case kThreadPriority_RealtimeAudio
:
35 case kThreadPriority_Background
:
37 case kThreadPriority_Normal
:
39 case kThreadPriority_Display
:
42 NOTREACHED() << "Unknown priority.";
46 #endif // !defined(OS_NACL)
51 void PlatformThread::SetName(const char* name
) {
52 ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name
);
53 tracked_objects::ThreadData::InitializeThreadContext(name
);
56 // On linux we can get the thread names to show up in the debugger by setting
57 // the process name for the LWP. We don't want to do this for the main
58 // thread because that would rename the process, causing tools like killall
60 if (PlatformThread::CurrentId() == getpid())
63 // http://0pointer.de/blog/projects/name-your-threads.html
64 // Set the name for the LWP (which gets truncated to 15 characters).
65 // Note that glibc also has a 'pthread_setname_np' api, but it may not be
66 // available everywhere and it's only benefit over using prctl directly is
67 // that it can set the name of threads other than the current thread.
68 int err
= prctl(PR_SET_NAME
, name
);
69 // We expect EPERM failures in sandboxed processes, just ignore those.
70 if (err
< 0 && errno
!= EPERM
)
71 DPLOG(ERROR
) << "prctl(PR_SET_NAME)";
72 #endif // !defined(OS_NACL)
76 void PlatformThread::SetThreadPriority(PlatformThreadHandle handle
,
77 ThreadPriority priority
) {
79 if (priority
== kThreadPriority_RealtimeAudio
) {
80 const struct sched_param kRealTimePrio
= {8};
81 if (pthread_setschedparam(pthread_self(), SCHED_RR
, &kRealTimePrio
) == 0) {
82 // Got real time priority, no need to set nice level.
87 // setpriority(2) should change the whole thread group's (i.e. process)
88 // priority. however, on linux it will only change the target thread's
89 // priority. see the bugs section in
90 // http://man7.org/linux/man-pages/man2/getpriority.2.html.
91 // we prefer using 0 rather than the current thread id since they are
92 // equivalent but it makes sandboxing easier (https://crbug.com/399473).
93 DCHECK_NE(handle
.id_
, kInvalidThreadId
);
94 const int kNiceSetting
= ThreadNiceValue(priority
);
95 const PlatformThreadId current_id
= PlatformThread::CurrentId();
96 if (setpriority(PRIO_PROCESS
,
97 handle
.id_
== current_id
? 0 : handle
.id_
,
99 DVPLOG(1) << "Failed to set nice value of thread (" << handle
.id_
<< ") to "
102 #endif // !defined(OS_NACL)
105 void InitThreading() {}
107 void InitOnThread() {}
109 void TerminateOnThread() {}
111 size_t GetDefaultThreadStackSize(const pthread_attr_t
& attributes
) {
112 #if !defined(THREAD_SANITIZER)
115 // ThreadSanitizer bloats the stack heavily. Evidence has been that the
116 // default stack size isn't enough for some browser tests.
117 return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux).