| // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/platform_thread.h" |
| |
| #include <errno.h> |
| #include <sched.h> |
| |
| #if defined(OS_MACOSX) |
| #include <mach/mach.h> |
| #else |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| #endif |
| |
| #if defined(OS_MACOSX) |
| namespace base { |
| void InitThreading(); |
| } // namespace |
| #endif |
| |
| static void* ThreadFunc(void* closure) { |
| PlatformThread::Delegate* delegate = |
| static_cast<PlatformThread::Delegate*>(closure); |
| delegate->ThreadMain(); |
| return NULL; |
| } |
| |
| // static |
| PlatformThreadId PlatformThread::CurrentId() { |
| // Pthreads doesn't have the concept of a thread ID, so we have to reach down |
| // into the kernel. |
| #if defined(OS_MACOSX) |
| return mach_thread_self(); |
| #elif defined(OS_LINUX) |
| return syscall(__NR_gettid); |
| #elif defined(OS_FREEBSD) |
| // TODO(BSD): find a better thread ID |
| return reinterpret_cast<int64>(pthread_self()); |
| #endif |
| } |
| |
| // static |
| void PlatformThread::YieldCurrentThread() { |
| sched_yield(); |
| } |
| |
| // static |
| void PlatformThread::Sleep(int duration_ms) { |
| struct timespec sleep_time, remaining; |
| |
| // Contains the portion of duration_ms >= 1 sec. |
| sleep_time.tv_sec = duration_ms / 1000; |
| duration_ms -= sleep_time.tv_sec * 1000; |
| |
| // Contains the portion of duration_ms < 1 sec. |
| sleep_time.tv_nsec = duration_ms * 1000 * 1000; // nanoseconds. |
| |
| while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR) |
| sleep_time = remaining; |
| } |
| |
| // static |
| void PlatformThread::SetName(const char* name) { |
| // The POSIX standard does not provide for naming threads, and neither Linux |
| // nor Mac OS X (our two POSIX targets) provide any non-portable way of doing |
| // it either. (Some BSDs provide pthread_set_name_np but that isn't much of a |
| // consolation prize.) |
| // TODO(darin): decide whether stuffing the name in TLS or other in-memory |
| // structure would be useful for debugging or not. |
| } |
| |
| namespace { |
| |
| bool CreateThread(size_t stack_size, bool joinable, |
| PlatformThread::Delegate* delegate, |
| PlatformThreadHandle* thread_handle) { |
| #if defined(OS_MACOSX) |
| base::InitThreading(); |
| #endif // OS_MACOSX |
| |
| bool success = false; |
| pthread_attr_t attributes; |
| pthread_attr_init(&attributes); |
| |
| // Pthreads are joinable by default, so only specify the detached attribute if |
| // the thread should be non-joinable. |
| if (!joinable) { |
| pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_DETACHED); |
| } |
| |
| if (stack_size > 0) |
| pthread_attr_setstacksize(&attributes, stack_size); |
| |
| success = !pthread_create(thread_handle, &attributes, ThreadFunc, delegate); |
| |
| pthread_attr_destroy(&attributes); |
| return success; |
| } |
| |
| } // anonymous namespace |
| |
| // static |
| bool PlatformThread::Create(size_t stack_size, Delegate* delegate, |
| PlatformThreadHandle* thread_handle) { |
| return CreateThread(stack_size, true /* joinable thread */, |
| delegate, thread_handle); |
| } |
| |
| // static |
| bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) { |
| PlatformThreadHandle unused; |
| |
| bool result = CreateThread(stack_size, false /* non-joinable thread */, |
| delegate, &unused); |
| return result; |
| } |
| |
| // static |
| void PlatformThread::Join(PlatformThreadHandle thread_handle) { |
| pthread_join(thread_handle, NULL); |
| } |