| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "thread_posix.h" |
| |
| #include <errno.h> |
| #include <string.h> // strncpy |
| #include <time.h> // nanosleep |
| #include <unistd.h> |
| #ifdef WEBRTC_LINUX |
| #include <sys/types.h> |
| #include <sched.h> |
| #include <sys/syscall.h> |
| #include <linux/unistd.h> |
| #include <sys/prctl.h> |
| #endif |
| |
| #include "event_wrapper.h" |
| #include "trace.h" |
| |
| namespace webrtc { |
| extern "C" |
| { |
| static void* StartThread(void* lpParameter) |
| { |
| static_cast<ThreadPosix*>(lpParameter)->Run(); |
| return 0; |
| } |
| } |
| |
| #if (defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID)) |
| static pid_t gettid() |
| { |
| #if defined(__NR_gettid) |
| return syscall(__NR_gettid); |
| #else |
| return -1; |
| #endif |
| } |
| #endif |
| |
| ThreadWrapper* ThreadPosix::Create(ThreadRunFunction func, ThreadObj obj, |
| ThreadPriority prio, const char* threadName) |
| { |
| ThreadPosix* ptr = new ThreadPosix(func, obj, prio, threadName); |
| if (!ptr) |
| { |
| return NULL; |
| } |
| const int error = ptr->Construct(); |
| if (error) |
| { |
| delete ptr; |
| return NULL; |
| } |
| return ptr; |
| } |
| |
| ThreadPosix::ThreadPosix(ThreadRunFunction func, ThreadObj obj, |
| ThreadPriority prio, const char* threadName) |
| : _runFunction(func), |
| _obj(obj), |
| _alive(false), |
| _dead(true), |
| _prio(prio), |
| _event(EventWrapper::Create()), |
| _setThreadName(false) |
| { |
| #ifdef WEBRTC_LINUX |
| _linuxPid = -1; |
| #endif |
| if (threadName != NULL) |
| { |
| _setThreadName = true; |
| strncpy(_name, threadName, kThreadMaxNameLength); |
| } |
| } |
| |
| int ThreadPosix::Construct() |
| { |
| int result = 0; |
| #if !defined(WEBRTC_ANDROID) |
| // Enable immediate cancellation if requested, see Shutdown() |
| result = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL); |
| if (result != 0) |
| { |
| return -1; |
| } |
| result = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); |
| if (result != 0) |
| { |
| return -1; |
| } |
| #endif |
| result = pthread_attr_init(&_attr); |
| if (result != 0) |
| { |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| ThreadPosix::~ThreadPosix() |
| { |
| pthread_attr_destroy(&_attr); |
| delete _event; |
| } |
| |
| #define HAS_THREAD_ID !defined(MAC_IPHONE) && !defined(MAC_IPHONE_SIM) && \ |
| !defined(WEBRTC_MAC) && !defined(WEBRTC_MAC_INTEL) && \ |
| !defined(MAC_DYLIB) && !defined(MAC_INTEL_DYLIB) |
| #if HAS_THREAD_ID |
| bool ThreadPosix::Start(unsigned int& threadID) |
| #else |
| bool ThreadPosix::Start(unsigned int& /*threadID*/) |
| #endif |
| { |
| if (!_runFunction) |
| { |
| return false; |
| } |
| int result = pthread_attr_setdetachstate(&_attr, PTHREAD_CREATE_DETACHED); |
| // Set the stack stack size to 1M. |
| result |= pthread_attr_setstacksize(&_attr, 1024*1024); |
| #ifdef WEBRTC_THREAD_RR |
| const int policy = SCHED_RR; |
| #else |
| const int policy = SCHED_FIFO; |
| #endif |
| _event->Reset(); |
| result |= pthread_create(&_thread, &_attr, &StartThread, this); |
| if (result != 0) |
| { |
| return false; |
| } |
| |
| // Wait up to 10 seconds for the OS to call the callback function. Prevents |
| // race condition if Stop() is called too quickly after start. |
| if (kEventSignaled != _event->Wait(WEBRTC_EVENT_10_SEC)) |
| { |
| // Timed out. Something went wrong. |
| _runFunction = NULL; |
| return false; |
| } |
| |
| #if HAS_THREAD_ID |
| threadID = static_cast<unsigned int>(_thread); |
| #endif |
| sched_param param; |
| |
| const int minPrio = sched_get_priority_min(policy); |
| const int maxPrio = sched_get_priority_max(policy); |
| if ((minPrio == EINVAL) || (maxPrio == EINVAL)) |
| { |
| return false; |
| } |
| |
| switch (_prio) |
| { |
| case kLowPriority: |
| param.sched_priority = minPrio + 1; |
| break; |
| case kNormalPriority: |
| param.sched_priority = (minPrio + maxPrio) / 2; |
| break; |
| case kHighPriority: |
| param.sched_priority = maxPrio - 3; |
| break; |
| case kHighestPriority: |
| param.sched_priority = maxPrio - 2; |
| break; |
| case kRealtimePriority: |
| param.sched_priority = maxPrio - 1; |
| break; |
| default: |
| return false; |
| } |
| result = pthread_setschedparam(_thread, policy, ¶m); |
| if (result == EINVAL) |
| { |
| return false; |
| } |
| return true; |
| } |
| |
| #if (defined(WEBRTC_LINUX) && !defined(WEBRTC_ANDROID)) |
| bool ThreadPosix::SetAffinity(const int* processorNumbers, |
| const unsigned int amountOfProcessors) |
| { |
| if (!processorNumbers || (amountOfProcessors == 0)) |
| { |
| return false; |
| } |
| |
| cpu_set_t mask; |
| CPU_ZERO(&mask); |
| |
| for(unsigned int processor = 0; |
| processor < amountOfProcessors; |
| processor++) |
| { |
| CPU_SET(processorNumbers[processor], &mask); |
| } |
| const int result = sched_setaffinity(_linuxPid, (unsigned int)sizeof(mask), |
| &mask); |
| if (result != 0) |
| { |
| return false; |
| |
| } |
| return true; |
| } |
| #else |
| // NOTE: On Mac OS X, use the Thread affinity API in |
| // /usr/include/mach/thread_policy.h: thread_policy_set and mach_thread_self() |
| // instead of Linux gettid() syscall. |
| bool ThreadPosix::SetAffinity(const int* , const unsigned int) |
| { |
| return false; |
| } |
| #endif |
| |
| void ThreadPosix::SetNotAlive() |
| { |
| _alive = false; |
| } |
| |
| bool ThreadPosix::Shutdown() |
| { |
| #if !defined(WEBRTC_ANDROID) |
| if (_thread && (0 != pthread_cancel(_thread))) |
| { |
| return false; |
| } |
| |
| return true; |
| #else |
| return false; |
| #endif |
| } |
| |
| bool ThreadPosix::Stop() |
| { |
| _alive = false; |
| |
| // TODO (hellner) why not use an event here? |
| // Wait up to 10 seconds for the thread to terminate |
| for (int i = 0; i < 1000 && !_dead; i++) |
| { |
| timespec t; |
| t.tv_sec = 0; |
| t.tv_nsec = 10*1000*1000; |
| nanosleep(&t, NULL); |
| } |
| if (_dead) |
| { |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| void ThreadPosix::Run() |
| { |
| _alive = true; |
| _dead = false; |
| #ifdef WEBRTC_LINUX |
| if(_linuxPid == -1) |
| { |
| _linuxPid = gettid(); |
| } |
| #endif |
| // The event the Start() is waiting for. |
| _event->Set(); |
| |
| if (_setThreadName) |
| { |
| #ifdef WEBRTC_LINUX |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1, |
| "Thread with id:%d name:%s started ", _linuxPid, _name); |
| prctl(PR_SET_NAME, (unsigned long)_name, 0, 0, 0); |
| #else |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1, |
| "Thread with name:%s started ", _name); |
| #endif |
| }else |
| { |
| #ifdef WEBRTC_LINUX |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1, |
| "Thread with id:%d without name started", _linuxPid); |
| #else |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility, -1, |
| "Thread without name started"); |
| #endif |
| } |
| do |
| { |
| if (_runFunction) |
| { |
| if (!_runFunction(_obj)) |
| { |
| _alive = false; |
| } |
| } |
| else |
| { |
| _alive = false; |
| } |
| } |
| while (_alive); |
| |
| if (_setThreadName) |
| { |
| // Don't set the name for the trace thread because it may cause a |
| // deadlock. TODO (hellner) there should be a better solution than |
| // coupling the thread and the trace class like this. |
| if (strcmp(_name, "Trace")) |
| { |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1, |
| "Thread with name:%s stopped", _name); |
| } |
| } |
| else |
| { |
| WEBRTC_TRACE(kTraceStateInfo, kTraceUtility,-1, |
| "Thread without name stopped"); |
| } |
| _dead = true; |
| } |
| } // namespace webrtc |
