362 lines
11 KiB
C++
362 lines
11 KiB
C++
// Copyright (c) 2012 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 <pthread.h>
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#include <sched.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include "base/debug/activity_tracker.h"
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/no_destructor.h"
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#include "base/threading/platform_thread_internal_posix.h"
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#include "base/threading/scoped_blocking_call.h"
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#include "base/threading/thread_id_name_manager.h"
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#include "build/build_config.h"
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#if !defined(OS_MACOSX) && !defined(OS_FUCHSIA) && !defined(OS_NACL)
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#include "base/posix/can_lower_nice_to.h"
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#endif
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#if defined(OS_LINUX)
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#include <sys/syscall.h>
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#endif
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#if defined(OS_FUCHSIA)
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#include <zircon/process.h>
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#else
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#include <sys/resource.h>
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#endif
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namespace base {
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void InitThreading();
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void TerminateOnThread();
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size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes);
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namespace {
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struct ThreadParams {
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ThreadParams()
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: delegate(nullptr), joinable(false), priority(ThreadPriority::NORMAL) {}
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PlatformThread::Delegate* delegate;
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bool joinable;
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ThreadPriority priority;
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};
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void* ThreadFunc(void* params) {
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PlatformThread::Delegate* delegate = nullptr;
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{
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std::unique_ptr<ThreadParams> thread_params(
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static_cast<ThreadParams*>(params));
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delegate = thread_params->delegate;
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if (!thread_params->joinable)
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base::ThreadRestrictions::SetSingletonAllowed(false);
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#if !defined(OS_NACL)
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// Threads on linux/android may inherit their priority from the thread
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// where they were created. This explicitly sets the priority of all new
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// threads.
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PlatformThread::SetCurrentThreadPriority(thread_params->priority);
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#endif
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}
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ThreadIdNameManager::GetInstance()->RegisterThread(
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PlatformThread::CurrentHandle().platform_handle(),
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PlatformThread::CurrentId());
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delegate->ThreadMain();
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ThreadIdNameManager::GetInstance()->RemoveName(
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PlatformThread::CurrentHandle().platform_handle(),
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PlatformThread::CurrentId());
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base::TerminateOnThread();
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return nullptr;
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}
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bool CreateThread(size_t stack_size,
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bool joinable,
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PlatformThread::Delegate* delegate,
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PlatformThreadHandle* thread_handle,
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ThreadPriority priority) {
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DCHECK(thread_handle);
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base::InitThreading();
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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
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// attribute if 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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// Get a better default if available.
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if (stack_size == 0)
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stack_size = base::GetDefaultThreadStackSize(attributes);
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if (stack_size > 0)
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pthread_attr_setstacksize(&attributes, stack_size);
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std::unique_ptr<ThreadParams> params(new ThreadParams);
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params->delegate = delegate;
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params->joinable = joinable;
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params->priority = priority;
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pthread_t handle;
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int err = pthread_create(&handle, &attributes, ThreadFunc, params.get());
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bool success = !err;
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if (success) {
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// ThreadParams should be deleted on the created thread after used.
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ignore_result(params.release());
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} else {
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// Value of |handle| is undefined if pthread_create fails.
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handle = 0;
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errno = err;
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PLOG(ERROR) << "pthread_create";
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}
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*thread_handle = PlatformThreadHandle(handle);
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pthread_attr_destroy(&attributes);
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return success;
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}
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#if defined(OS_LINUX)
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// Store the thread ids in local storage since calling the SWI can
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// expensive and PlatformThread::CurrentId is used liberally. Clear
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// the stored value after a fork() because forking changes the thread
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// id. Forking without going through fork() (e.g. clone()) is not
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// supported, but there is no known usage. Using thread_local is
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// fine here (despite being banned) since it is going to be allowed
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// but is blocked on a clang bug for Mac (https://crbug.com/829078)
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// and we can't use ThreadLocalStorage because of re-entrancy due to
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// CHECK/DCHECKs.
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thread_local pid_t g_thread_id = -1;
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class InitAtFork {
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public:
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InitAtFork() { pthread_atfork(nullptr, nullptr, internal::ClearTidCache); }
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};
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#endif // defined(OS_LINUX)
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} // namespace
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#if defined(OS_LINUX)
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namespace internal {
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void ClearTidCache() {
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g_thread_id = -1;
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}
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} // namespace internal
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#endif // defined(OS_LINUX)
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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 pthread_mach_thread_np(pthread_self());
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#elif defined(OS_LINUX)
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static NoDestructor<InitAtFork> init_at_fork;
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if (g_thread_id == -1) {
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g_thread_id = syscall(__NR_gettid);
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} else {
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DCHECK_EQ(g_thread_id, syscall(__NR_gettid))
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<< "Thread id stored in TLS is different from thread id returned by "
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"the system. It is likely that the process was forked without going "
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"through fork().";
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}
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return g_thread_id;
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#elif defined(OS_ANDROID)
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return gettid();
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#elif defined(OS_FUCHSIA)
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return zx_thread_self();
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#elif defined(OS_SOLARIS) || defined(OS_QNX)
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return pthread_self();
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#elif defined(OS_NACL) && defined(__GLIBC__)
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return pthread_self();
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#elif defined(OS_NACL) && !defined(__GLIBC__)
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// Pointers are 32-bits in NaCl.
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return reinterpret_cast<int32_t>(pthread_self());
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#elif defined(OS_POSIX) && defined(OS_AIX)
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return pthread_self();
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#elif defined(OS_POSIX) && !defined(OS_AIX)
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return reinterpret_cast<int64_t>(pthread_self());
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#endif
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}
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// static
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PlatformThreadRef PlatformThread::CurrentRef() {
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return PlatformThreadRef(pthread_self());
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}
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// static
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PlatformThreadHandle PlatformThread::CurrentHandle() {
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return PlatformThreadHandle(pthread_self());
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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(TimeDelta duration) {
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struct timespec sleep_time, remaining;
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// Break the duration into seconds and nanoseconds.
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// NOTE: TimeDelta's microseconds are int64s while timespec's
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// nanoseconds are longs, so this unpacking must prevent overflow.
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sleep_time.tv_sec = duration.InSeconds();
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duration -= TimeDelta::FromSeconds(sleep_time.tv_sec);
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sleep_time.tv_nsec = duration.InMicroseconds() * 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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// static
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const char* PlatformThread::GetName() {
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return ThreadIdNameManager::GetInstance()->GetName(CurrentId());
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}
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// static
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bool PlatformThread::CreateWithPriority(size_t stack_size, Delegate* delegate,
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PlatformThreadHandle* thread_handle,
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ThreadPriority priority) {
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return CreateThread(stack_size, true /* joinable thread */, delegate,
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thread_handle, priority);
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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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return CreateNonJoinableWithPriority(stack_size, delegate,
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ThreadPriority::NORMAL);
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}
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// static
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bool PlatformThread::CreateNonJoinableWithPriority(size_t stack_size,
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Delegate* delegate,
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ThreadPriority priority) {
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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, priority);
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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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// Record the event that this thread is blocking upon (for hang diagnosis).
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base::debug::ScopedThreadJoinActivity thread_activity(&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::internal::ScopedBlockingCallWithBaseSyncPrimitives scoped_blocking_call(
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FROM_HERE, base::BlockingType::MAY_BLOCK);
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CHECK_EQ(0, pthread_join(thread_handle.platform_handle(), nullptr));
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}
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// static
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void PlatformThread::Detach(PlatformThreadHandle thread_handle) {
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CHECK_EQ(0, pthread_detach(thread_handle.platform_handle()));
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}
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// Mac and Fuchsia have their own Set/GetCurrentThreadPriority()
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// implementations.
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#if !defined(OS_MACOSX) && !defined(OS_FUCHSIA)
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// static
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bool PlatformThread::CanIncreaseThreadPriority(ThreadPriority priority) {
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#if defined(OS_NACL)
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return false;
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#else
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auto platform_specific_ability =
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internal::CanIncreaseCurrentThreadPriorityForPlatform(priority);
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if (platform_specific_ability)
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return platform_specific_ability.value();
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return internal::CanLowerNiceTo(
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internal::ThreadPriorityToNiceValue(priority));
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#endif // defined(OS_NACL)
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}
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// static
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void PlatformThread::SetCurrentThreadPriorityImpl(ThreadPriority priority) {
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#if defined(OS_NACL)
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NOTIMPLEMENTED();
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#else
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if (internal::SetCurrentThreadPriorityForPlatform(priority))
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return;
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// setpriority(2) should change the whole thread group's (i.e. process)
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// priority. However, as stated in the bugs section of
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// http://man7.org/linux/man-pages/man2/getpriority.2.html: "under the current
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// Linux/NPTL implementation of POSIX threads, the nice value is a per-thread
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// attribute". Also, 0 is prefered to the current thread id since it is
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// equivalent but makes sandboxing easier (https://crbug.com/399473).
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const int nice_setting = internal::ThreadPriorityToNiceValue(priority);
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if (setpriority(PRIO_PROCESS, 0, nice_setting)) {
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DVPLOG(1) << "Failed to set nice value of thread ("
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<< PlatformThread::CurrentId() << ") to " << nice_setting;
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}
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#endif // defined(OS_NACL)
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}
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// static
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ThreadPriority PlatformThread::GetCurrentThreadPriority() {
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#if defined(OS_NACL)
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NOTIMPLEMENTED();
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return ThreadPriority::NORMAL;
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#else
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// Mirrors SetCurrentThreadPriority()'s implementation.
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auto platform_specific_priority =
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internal::GetCurrentThreadPriorityForPlatform();
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if (platform_specific_priority)
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return platform_specific_priority.value();
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// Need to clear errno before calling getpriority():
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// http://man7.org/linux/man-pages/man2/getpriority.2.html
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errno = 0;
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int nice_value = getpriority(PRIO_PROCESS, 0);
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if (errno != 0) {
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DVPLOG(1) << "Failed to get nice value of thread ("
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<< PlatformThread::CurrentId() << ")";
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return ThreadPriority::NORMAL;
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}
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return internal::NiceValueToThreadPriority(nice_value);
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#endif // !defined(OS_NACL)
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}
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#endif // !defined(OS_MACOSX) && !defined(OS_FUCHSIA)
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// static
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size_t PlatformThread::GetDefaultThreadStackSize() {
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pthread_attr_t attributes;
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pthread_attr_init(&attributes);
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return base::GetDefaultThreadStackSize(attributes);
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}
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} // namespace base
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