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// 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>
#elif defined(OS_NETBSD)
#include <lwp.h>
#elif defined(OS_LINUX)
#include <sys/syscall.h>
#include <sys/prctl.h>
#elif defined(OS_FREEBSD) && !defined(__GLIBC__)
#include <sys/param.h>
#include <sys/thr.h>
#endif
#if !defined(OS_MACOSX)
#include <unistd.h>
#endif
#if defined(OS_BSD) && !defined(OS_NETBSD) && !defined(__GLIBC__)
#include <pthread_np.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)
mach_port_t port = mach_thread_self();
mach_port_deallocate(mach_task_self(), port);
return port;
#elif defined(OS_LINUX)
return syscall(__NR_gettid);
#elif defined(OS_OPENBSD) || defined(__GLIBC__)
return (intptr_t) (pthread_self());
#elif defined(OS_NETBSD)
return _lwp_self();
#elif defined(OS_DRAGONFLY)
return lwp_gettid();
#elif defined(OS_FREEBSD)
# if __FreeBSD_version > 900030
return pthread_getthreadid_np();
# else
long lwpid;
thr_self(&lwpid);
return lwpid;
# endif
#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;
}
#ifndef OS_MACOSX
// Mac is implemented in platform_thread_mac.mm.
// static
void PlatformThread::SetName(const char* name) {
// On linux we can get the thread names to show up in the debugger by setting
// the process name for the LWP. We don't want to do this for the main
// thread because that would rename the process, causing tools like killall
// to stop working.
if (PlatformThread::CurrentId() == getpid())
return;
// http://0pointer.de/blog/projects/name-your-threads.html
// Set the name for the LWP (which gets truncated to 15 characters).
// Note that glibc also has a 'pthread_setname_np' api, but it may not be
// available everywhere and it's only benefit over using prctl directly is
// that it can set the name of threads other than the current thread.
#if defined(OS_LINUX)
prctl(PR_SET_NAME, reinterpret_cast<uintptr_t>(name), 0, 0, 0);
#elif defined(OS_NETBSD)
pthread_setname_np(pthread_self(), "%s", (void *)name);
#elif defined(OS_BSD) && !defined(__GLIBC__)
pthread_set_name_np(pthread_self(), name);
#else
#endif
}
#endif // !OS_MACOSX
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);
}