163 lines
4.6 KiB
C++
163 lines
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/platform_thread.h"
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#include <errno.h>
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#include <sched.h>
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#if defined(OS_MACOSX)
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#include <mach/mach.h>
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#elif defined(OS_NETBSD)
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#include <lwp.h>
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#elif defined(OS_LINUX)
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#include <sys/syscall.h>
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#include <sys/prctl.h>
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#endif
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#if !defined(OS_MACOSX)
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#include <unistd.h>
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#endif
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#if defined(OS_BSD) && !defined(OS_NETBSD) && !defined(__GLIBC__)
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#include <pthread_np.h>
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#endif
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#if defined(OS_MACOSX)
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namespace base {
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void InitThreading();
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} // namespace
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#endif
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static void* ThreadFunc(void* closure) {
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PlatformThread::Delegate* delegate =
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static_cast<PlatformThread::Delegate*>(closure);
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delegate->ThreadMain();
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return NULL;
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}
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// static
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PlatformThreadId PlatformThread::CurrentId() {
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// Pthreads doesn't have the concept of a thread ID, so we have to reach down
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// into the kernel.
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#if defined(OS_MACOSX)
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mach_port_t port = mach_thread_self();
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mach_port_deallocate(mach_task_self(), port);
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return port;
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#elif defined(OS_LINUX)
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return syscall(__NR_gettid);
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#elif defined(OS_OPENBSD) || defined(OS_SOLARIS) || defined(__GLIBC__)
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return (intptr_t) (pthread_self());
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#elif defined(OS_NETBSD)
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return _lwp_self();
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#elif defined(OS_DRAGONFLY)
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return lwp_gettid();
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#elif defined(OS_FREEBSD)
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return pthread_getthreadid_np();
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#endif
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}
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// static
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void PlatformThread::YieldCurrentThread() {
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sched_yield();
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}
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// static
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void PlatformThread::Sleep(int duration_ms) {
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struct timespec sleep_time, remaining;
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// Contains the portion of duration_ms >= 1 sec.
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sleep_time.tv_sec = duration_ms / 1000;
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duration_ms -= sleep_time.tv_sec * 1000;
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// Contains the portion of duration_ms < 1 sec.
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sleep_time.tv_nsec = duration_ms * 1000 * 1000; // nanoseconds.
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while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
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sleep_time = remaining;
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}
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#ifndef OS_MACOSX
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// Mac is implemented in platform_thread_mac.mm.
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// static
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void PlatformThread::SetName(const char* name) {
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// On linux we can get the thread names to show up in the debugger by setting
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// the process name for the LWP. We don't want to do this for the main
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// thread because that would rename the process, causing tools like killall
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// to stop working.
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if (PlatformThread::CurrentId() == getpid())
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return;
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// http://0pointer.de/blog/projects/name-your-threads.html
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// Set the name for the LWP (which gets truncated to 15 characters).
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// Note that glibc also has a 'pthread_setname_np' api, but it may not be
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// available everywhere and it's only benefit over using prctl directly is
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// that it can set the name of threads other than the current thread.
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#if defined(OS_LINUX)
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prctl(PR_SET_NAME, reinterpret_cast<uintptr_t>(name), 0, 0, 0);
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#elif defined(OS_NETBSD)
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pthread_setname_np(pthread_self(), "%s", (void *)name);
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#elif defined(OS_BSD) && !defined(__GLIBC__)
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pthread_set_name_np(pthread_self(), name);
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#elif defined(OS_SOLARIS)
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pthread_setname_np(pthread_self(), name);
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#else
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#endif
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}
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#endif // !OS_MACOSX
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namespace {
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bool CreateThread(size_t stack_size, bool joinable,
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PlatformThread::Delegate* delegate,
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PlatformThreadHandle* thread_handle) {
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#if defined(OS_MACOSX)
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base::InitThreading();
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#endif // OS_MACOSX
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bool success = false;
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pthread_attr_t attributes;
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pthread_attr_init(&attributes);
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// Pthreads are joinable by default, so only specify the detached attribute if
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// the thread should be non-joinable.
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if (!joinable) {
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pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_DETACHED);
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}
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if (stack_size > 0)
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pthread_attr_setstacksize(&attributes, stack_size);
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success = !pthread_create(thread_handle, &attributes, ThreadFunc, delegate);
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pthread_attr_destroy(&attributes);
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return success;
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}
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} // anonymous namespace
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// static
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bool PlatformThread::Create(size_t stack_size, Delegate* delegate,
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PlatformThreadHandle* thread_handle) {
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return CreateThread(stack_size, true /* joinable thread */,
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delegate, thread_handle);
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}
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// static
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bool PlatformThread::CreateNonJoinable(size_t stack_size, Delegate* delegate) {
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PlatformThreadHandle unused;
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bool result = CreateThread(stack_size, false /* non-joinable thread */,
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delegate, &unused);
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return result;
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}
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// static
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void PlatformThread::Join(PlatformThreadHandle thread_handle) {
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pthread_join(thread_handle, NULL);
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}
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