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| 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. | |
| 4 | |
| 5 #include "base/threading/platform_thread.h" | |
| 6 | |
| 7 #include <errno.h> | |
| 8 #include <sched.h> | |
| 9 | |
| 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" | |
| 15 | |
| 16 #if !defined(OS_NACL) | |
| 17 #include <pthread.h> | |
| 18 #include <sys/prctl.h> | |
| 19 #include <sys/types.h> | |
| 20 #include <unistd.h> | |
| 21 #endif | |
| 22 | |
| 23 namespace base { | |
| 24 | |
| 25 namespace internal { | |
| 26 | |
| 27 namespace { | |
| 28 #if !defined(OS_NACL) | |
| 29 const struct sched_param kRealTimePrio = {8}; | |
| 30 const struct sched_param kResetPrio = {0}; | |
| 31 #endif | |
| 32 } // namespace | |
| 33 | |
| 34 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = { | |
| 35 {ThreadPriority::BACKGROUND, 10}, | |
| 36 {ThreadPriority::NORMAL, 0}, | |
| 37 {ThreadPriority::DISPLAY, -6}, | |
| 38 {ThreadPriority::REALTIME_AUDIO, -10}, | |
| 39 }; | |
| 40 | |
| 41 bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority) { | |
| 42 #if !defined(OS_NACL) | |
| 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); | |
| 51 return false; | |
| 52 } | |
| 53 return priority == ThreadPriority::REALTIME_AUDIO && | |
| 54 pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0; | |
| 55 #else | |
| 56 return false; | |
| 57 #endif | |
| 58 } | |
| 59 | |
| 60 bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority) { | |
| 61 #if !defined(OS_NACL) | |
| 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; | |
| 69 return true; | |
| 70 } | |
| 71 #endif | |
| 72 return false; | |
| 73 } | |
| 74 | |
| 75 } // namespace internal | |
| 76 | |
| 77 // static | |
| 78 void PlatformThread::SetName(const std::string& name) { | |
| 79 ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name); | |
| 80 tracked_objects::ThreadData::InitializeThreadContext(name); | |
| 81 | |
| 82 #if !defined(OS_NACL) | |
| 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 | |
| 86 // to stop working. | |
| 87 if (PlatformThread::CurrentId() == getpid()) | |
| 88 return; | |
| 89 | |
| 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) | |
| 100 } | |
| 101 | |
| 102 void InitThreading() {} | |
| 103 | |
| 104 void InitOnThread() {} | |
| 105 | |
| 106 void TerminateOnThread() {} | |
| 107 | |
| 108 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) { | |
| 109 #if !defined(THREAD_SANITIZER) | |
| 110 return 0; | |
| 111 #else | |
| 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). | |
| 115 #endif | |
| 116 } | |
| 117 | |
| 118 } // namespace base | |
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