platform_thread_linux.cc revision 424c4d7b64af9d0d8fd9624f381f469654d5e3d2
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) 187d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#if !defined(OS_NACL) 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) switch (priority) { 3190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_RealtimeAudio: 32424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return -10; 3390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Background: 34424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return 10; 3590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Normal: 36424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return 0; 3790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Display: 38424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return -6; 3990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 4090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) NOTREACHED() << "Unknown priority."; 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 4490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace 4590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetName(const char* name) { 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name); 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) tracked_objects::ThreadData::InitializeThreadContext(name); 5090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 51424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#if !defined(OS_NACL) 5290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // On linux we can get the thread names to show up in the debugger by setting 5390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // the process name for the LWP. We don't want to do this for the main 5490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // thread because that would rename the process, causing tools like killall 5590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // to stop working. 5690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (PlatformThread::CurrentId() == getpid()) 5790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 5890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 5990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // http://0pointer.de/blog/projects/name-your-threads.html 6090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Set the name for the LWP (which gets truncated to 15 characters). 6190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Note that glibc also has a 'pthread_setname_np' api, but it may not be 6290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // available everywhere and it's only benefit over using prctl directly is 6390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // that it can set the name of threads other than the current thread. 6490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int err = prctl(PR_SET_NAME, name); 6590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // We expect EPERM failures in sandboxed processes, just ignore those. 6690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (err < 0 && errno != EPERM) 6790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DPLOG(ERROR) << "prctl(PR_SET_NAME)"; 68424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif // !defined(OS_NACL) 6990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 7090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 7190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 7290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetThreadPriority(PlatformThreadHandle handle, 7390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadPriority priority) { 74868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if !defined(OS_NACL) 75868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (priority == kThreadPriority_RealtimeAudio) { 76424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) const struct sched_param kRealTimePrio = { 8 }; 77424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) if (pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0) { 78868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) // Got real time priority, no need to set nice level. 79868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return; 80868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 81868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 82868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 8390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // setpriority(2) will set a thread's priority if it is passed a tid as 8490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // the 'process identifier', not affecting the rest of the threads in the 8590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // process. Setting this priority will only succeed if the user has been 8690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // granted permission to adjust nice values on the system. 8790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK_NE(handle.id_, kInvalidThreadId); 88424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) const int kNiceSetting = ThreadNiceValue(priority); 89424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting)) { 90424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) DVPLOG(1) << "Failed to set nice value of thread (" 91424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) << handle.id_ << ") to " << kNiceSetting; 92424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) } 93424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif // !defined(OS_NACL) 9490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 9590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 96424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void InitThreading() {} 9790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 98424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void InitOnThread() {} 9990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 100424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void TerminateOnThread() {} 10190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) { 10390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 10490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace base 107