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225 lines
7.1 KiB
225 lines
7.1 KiB
// Copyright (c) 2010 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/threading/platform_thread.h"
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#include <errno.h>
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#include <sched.h>
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#include "base/logging.h"
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#include "base/safe_strerror_posix.h"
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#include "base/scoped_ptr.h"
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#include "base/threading/thread_restrictions.h"
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#if defined(OS_MACOSX)
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#include <mach/mach.h>
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#include <sys/resource.h>
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#include <algorithm>
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#endif
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#if defined(OS_LINUX)
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#include <dlfcn.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#endif
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#if defined(OS_NACL)
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#include <sys/nacl_syscalls.h>
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#endif
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namespace base {
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#if defined(OS_MACOSX)
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void InitThreading();
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#endif
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namespace {
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struct ThreadParams {
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PlatformThread::Delegate* delegate;
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bool joinable;
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};
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void* ThreadFunc(void* params) {
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ThreadParams* thread_params = static_cast<ThreadParams*>(params);
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PlatformThread::Delegate* delegate = thread_params->delegate;
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if (!thread_params->joinable)
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base::ThreadRestrictions::SetSingletonAllowed(false);
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delete thread_params;
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delegate->ThreadMain();
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return NULL;
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}
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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 defined(OS_MACOSX)
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// The Mac OS X default for a pthread stack size is 512kB.
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// Libc-594.1.4/pthreads/pthread.c's pthread_attr_init uses
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// DEFAULT_STACK_SIZE for this purpose.
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//
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// 512kB isn't quite generous enough for some deeply recursive threads that
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// otherwise request the default stack size by specifying 0. Here, adopt
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// glibc's behavior as on Linux, which is to use the current stack size
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// limit (ulimit -s) as the default stack size. See
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// glibc-2.11.1/nptl/nptl-init.c's __pthread_initialize_minimal_internal. To
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// avoid setting the limit below the Mac OS X default or the minimum usable
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// stack size, these values are also considered. If any of these values
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// can't be determined, or if stack size is unlimited (ulimit -s unlimited),
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// stack_size is left at 0 to get the system default.
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//
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// Mac OS X normally only applies ulimit -s to the main thread stack. On
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// contemporary OS X and Linux systems alike, this value is generally 8MB
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// or in that neighborhood.
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if (stack_size == 0) {
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size_t default_stack_size;
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struct rlimit stack_rlimit;
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if (pthread_attr_getstacksize(&attributes, &default_stack_size) == 0 &&
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getrlimit(RLIMIT_STACK, &stack_rlimit) == 0 &&
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stack_rlimit.rlim_cur != RLIM_INFINITY) {
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stack_size = std::max(std::max(default_stack_size,
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static_cast<size_t>(PTHREAD_STACK_MIN)),
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static_cast<size_t>(stack_rlimit.rlim_cur));
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}
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}
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#endif // OS_MACOSX
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if (stack_size > 0)
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pthread_attr_setstacksize(&attributes, stack_size);
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ThreadParams* params = new ThreadParams;
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params->delegate = delegate;
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params->joinable = joinable;
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success = !pthread_create(thread_handle, &attributes, ThreadFunc, params);
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pthread_attr_destroy(&attributes);
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if (!success)
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delete params;
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return success;
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}
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} // namespace
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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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return mach_thread_self();
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#elif defined(OS_LINUX)
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return syscall(__NR_gettid);
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#elif defined(OS_FREEBSD)
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// TODO(BSD): find a better thread ID
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return reinterpret_cast<int64>(pthread_self());
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#elif defined(OS_NACL)
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return pthread_self();
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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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// Linux SetName is currently disabled, as we need to distinguish between
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// helper threads (where it's ok to make this call) and the main thread
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// (where making this call renames our process, causing tools like killall
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// to stop working).
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#if 0 && defined(OS_LINUX)
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// static
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void PlatformThread::SetName(const char* name) {
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// http://0pointer.de/blog/projects/name-your-threads.html
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// glibc recently added support for pthread_setname_np, but it's not
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// commonly available yet. So test for it at runtime.
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int (*dynamic_pthread_setname_np)(pthread_t, const char*);
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*reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
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dlsym(RTLD_DEFAULT, "pthread_setname_np");
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if (dynamic_pthread_setname_np) {
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// This limit comes from glibc, which gets it from the kernel
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// (TASK_COMM_LEN).
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const int kMaxNameLength = 15;
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std::string shortened_name = std::string(name).substr(0, kMaxNameLength);
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int err = dynamic_pthread_setname_np(pthread_self(),
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shortened_name.c_str());
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if (err < 0)
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LOG(ERROR) << "pthread_setname_np: " << safe_strerror(err);
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} else {
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// Implementing this function without glibc is simple enough. (We
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// don't do the name length clipping as above because it will be
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// truncated by the callee (see TASK_COMM_LEN above).)
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int err = prctl(PR_SET_NAME, name);
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if (err < 0)
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PLOG(ERROR) << "prctl(PR_SET_NAME)";
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}
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}
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#elif defined(OS_MACOSX)
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// Mac is implemented in platform_thread_mac.mm.
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#else
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// static
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void PlatformThread::SetName(const char* /*name*/) {
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// Leave it unimplemented.
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// (This should be relatively simple to implement for the BSDs; I
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// just don't have one handy to test the code on.)
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}
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#endif // defined(OS_LINUX)
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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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// Joining another thread may block the current thread for a long time, since
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// the thread referred to by |thread_handle| may still be running long-lived /
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// blocking tasks.
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base::ThreadRestrictions::AssertIOAllowed();
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pthread_join(thread_handle, NULL);
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}
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} // namespace base
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