platform_thread_linux.cc revision 868fa2fe829687343ffae624259930155e16dbd8
190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// found in the LICENSE file. 490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/threading/platform_thread.h" 690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <errno.h> 890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <sched.h> 990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/lazy_instance.h" 1190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/logging.h" 1290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/memory/scoped_ptr.h" 1390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/safe_strerror_posix.h" 1490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/threading/thread_id_name_manager.h" 1590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/threading/thread_restrictions.h" 1690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include "base/tracked_objects.h" 1790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 1890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#if defined(OS_LINUX) 1990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <sys/prctl.h> 2090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <sys/resource.h> 2190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <sys/syscall.h> 2290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <sys/time.h> 2390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#include <unistd.h> 2490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#endif 2590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace base { 2790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 2890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)namespace { 2990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)int ThreadNiceValue(ThreadPriority priority) { 3090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) static const int threadPriorityAudio = -10; 3190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) static const int threadPriorityBackground = 10; 3290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) static const int threadPriorityDefault = 0; 3390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) static const int threadPriorityDisplay = -6; 3490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (priority) { 3590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_RealtimeAudio: 3690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return threadPriorityAudio; 3790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Background: 3890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return threadPriorityBackground; 3990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Normal: 4090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return threadPriorityDefault; 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Display: 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return threadPriorityDisplay; 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 4490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) NOTREACHED() << "Unknown priority."; 4590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 4690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 5190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetName(const char* name) { 5290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name); 5390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) tracked_objects::ThreadData::InitializeThreadContext(name); 5490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#ifndef OS_NACL 5690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // On linux we can get the thread names to show up in the debugger by setting 5790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // the process name for the LWP. We don't want to do this for the main 5890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // thread because that would rename the process, causing tools like killall 5990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // to stop working. 6090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (PlatformThread::CurrentId() == getpid()) 6190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 6290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // http://0pointer.de/blog/projects/name-your-threads.html 6490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Set the name for the LWP (which gets truncated to 15 characters). 6590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Note that glibc also has a 'pthread_setname_np' api, but it may not be 6690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // available everywhere and it's only benefit over using prctl directly is 6790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // that it can set the name of threads other than the current thread. 6890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int err = prctl(PR_SET_NAME, name); 6990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // We expect EPERM failures in sandboxed processes, just ignore those. 7090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (err < 0 && errno != EPERM) 7190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DPLOG(ERROR) << "prctl(PR_SET_NAME)"; 7290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)#endif 7390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 7490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 7590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 7690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetThreadPriority(PlatformThreadHandle handle, 7790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadPriority priority) { 78868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if !defined(OS_NACL) 79868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (priority == kThreadPriority_RealtimeAudio) { 80868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) const int kRealTimePrio = 8; 81868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 82868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) struct sched_param sched_param; 83868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) memset(&sched_param, 0, sizeof(sched_param)); 84868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) sched_param.sched_priority = kRealTimePrio; 85868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 86868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param) == 0) { 87868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) // Got real time priority, no need to set nice level. 88868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return; 89868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 90868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 91868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 9290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // setpriority(2) will set a thread's priority if it is passed a tid as 9390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // the 'process identifier', not affecting the rest of the threads in the 9490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // process. Setting this priority will only succeed if the user has been 9590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // granted permission to adjust nice values on the system. 9690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK_NE(handle.id_, kInvalidThreadId); 9790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int kNiceSetting = ThreadNiceValue(priority); 9890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting)) 9990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) LOG(ERROR) << "Failed to set nice value of thread to " << kNiceSetting; 100868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#endif // !OS_NACL 10190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void InitThreading() { 10490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void InitOnThread() { 10790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void TerminateOnThread() { 11090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 11190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 11290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) { 11390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 11490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 11590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 11690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace base 117