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 { 295c02ac1a9c1b504631c0a3d2b6e737b5d738bae1Bo Liu 3090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)int ThreadNiceValue(ThreadPriority priority) { 3190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) switch (priority) { 3290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_RealtimeAudio: 33424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return -10; 3490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Background: 35424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return 10; 3690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Normal: 37424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return 0; 3890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) case kThreadPriority_Display: 39424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) return -6; 4090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) default: 4190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) NOTREACHED() << "Unknown priority."; 4290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 4390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) } 4490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 455c02ac1a9c1b504631c0a3d2b6e737b5d738bae1Bo Liu 465c02ac1a9c1b504631c0a3d2b6e737b5d738bae1Bo Liu} // namespace 4790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 4890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 4990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetName(const char* name) { 5090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name); 5190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) tracked_objects::ThreadData::InitializeThreadContext(name); 5290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 53424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#if !defined(OS_NACL) 5490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // On linux we can get the thread names to show up in the debugger by setting 5590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // the process name for the LWP. We don't want to do this for the main 5690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // thread because that would rename the process, causing tools like killall 5790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // to stop working. 5890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (PlatformThread::CurrentId() == getpid()) 5990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return; 6090dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 6190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // http://0pointer.de/blog/projects/name-your-threads.html 6290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Set the name for the LWP (which gets truncated to 15 characters). 6390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // Note that glibc also has a 'pthread_setname_np' api, but it may not be 6490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // available everywhere and it's only benefit over using prctl directly is 6590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // that it can set the name of threads other than the current thread. 6690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) int err = prctl(PR_SET_NAME, name); 6790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) // We expect EPERM failures in sandboxed processes, just ignore those. 6890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) if (err < 0 && errno != EPERM) 6990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DPLOG(ERROR) << "prctl(PR_SET_NAME)"; 70424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif // !defined(OS_NACL) 7190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 7290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 7390dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)// static 7490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)void PlatformThread::SetThreadPriority(PlatformThreadHandle handle, 7590dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) ThreadPriority priority) { 76868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#if !defined(OS_NACL) 77868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (priority == kThreadPriority_RealtimeAudio) { 785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const struct sched_param kRealTimePrio = {8}; 79424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) if (pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0) { 80868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) // Got real time priority, no need to set nice level. 81868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return; 82868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 83868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) } 84868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // setpriority(2) should change the whole thread group's (i.e. process) 865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // priority. however, on linux it will only change the target thread's 875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // priority. see the bugs section in 885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // http://man7.org/linux/man-pages/man2/getpriority.2.html. 895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // we prefer using 0 rather than the current thread id since they are 905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // equivalent but it makes sandboxing easier (https://crbug.com/399473). 9190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) DCHECK_NE(handle.id_, kInvalidThreadId); 92424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) const int kNiceSetting = ThreadNiceValue(priority); 935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const PlatformThreadId current_id = PlatformThread::CurrentId(); 945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (setpriority(PRIO_PROCESS, 955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) handle.id_ == current_id ? 0 : handle.id_, 965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) kNiceSetting)) { 975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) DVPLOG(1) << "Failed to set nice value of thread (" << handle.id_ << ") to " 985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) << kNiceSetting; 99424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles) } 100424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)#endif // !defined(OS_NACL) 10190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 10290dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 103424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void InitThreading() {} 10490dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 105424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void InitOnThread() {} 10690dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 107424c4d7b64af9d0d8fd9624f381f469654d5e3d2Torne (Richard Coles)void TerminateOnThread() {} 10890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 10990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) { 1101320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci#if !defined(THREAD_SANITIZER) 11190dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) return 0; 1125d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#else 1135d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // ThreadSanitizer bloats the stack heavily. Evidence has been that the 1145d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // default stack size isn't enough for some browser tests. 1155d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux). 1165d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#endif 11790dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} 11890dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles) 11990dce4d38c5ff5333bea97d859d4e484e27edf0cTorne (Richard Coles)} // namespace base 120