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119 lines
3.8 KiB
C++
119 lines
3.8 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 <sched.h>
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#include "base/lazy_instance.h"
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#include "base/logging.h"
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#include "base/threading/platform_thread_internal_posix.h"
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#include "base/threading/thread_id_name_manager.h"
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#include "base/tracked_objects.h"
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#if !defined(OS_NACL)
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#include <pthread.h>
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#include <sys/prctl.h>
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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namespace base {
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namespace internal {
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namespace {
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#if !defined(OS_NACL)
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const struct sched_param kRealTimePrio = {8};
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const struct sched_param kResetPrio = {0};
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#endif
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} // namespace
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const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
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{ThreadPriority::BACKGROUND, 10},
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{ThreadPriority::NORMAL, 0},
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{ThreadPriority::DISPLAY, -6},
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{ThreadPriority::REALTIME_AUDIO, -10},
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};
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bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority) {
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#if !defined(OS_NACL)
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ThreadPriority current_priority;
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if (priority != ThreadPriority::REALTIME_AUDIO &&
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GetCurrentThreadPriorityForPlatform(¤t_priority) &&
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current_priority == ThreadPriority::REALTIME_AUDIO) {
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// If the pthread's round-robin scheduler is already enabled, and the new
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// priority will use setpriority() instead, the pthread scheduler should be
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// reset to use SCHED_OTHER so that setpriority() just works.
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pthread_setschedparam(pthread_self(), SCHED_OTHER, &kResetPrio);
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return false;
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}
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return priority == ThreadPriority::REALTIME_AUDIO &&
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pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
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#else
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return false;
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#endif
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}
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bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority) {
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#if !defined(OS_NACL)
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int maybe_sched_rr = 0;
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struct sched_param maybe_realtime_prio = {0};
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if (pthread_getschedparam(pthread_self(), &maybe_sched_rr,
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&maybe_realtime_prio) == 0 &&
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maybe_sched_rr == SCHED_RR &&
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maybe_realtime_prio.sched_priority == kRealTimePrio.sched_priority) {
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*priority = ThreadPriority::REALTIME_AUDIO;
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return true;
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}
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#endif
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return false;
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}
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} // namespace internal
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// static
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void PlatformThread::SetName(const std::string& name) {
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ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
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tracked_objects::ThreadData::InitializeThreadContext(name);
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#if !defined(OS_NACL)
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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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int err = prctl(PR_SET_NAME, name.c_str());
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// We expect EPERM failures in sandboxed processes, just ignore those.
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if (err < 0 && errno != EPERM)
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DPLOG(ERROR) << "prctl(PR_SET_NAME)";
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#endif // !defined(OS_NACL)
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}
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void InitThreading() {}
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void InitOnThread() {}
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void TerminateOnThread() {}
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size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
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#if !defined(THREAD_SANITIZER)
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return 0;
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#else
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// ThreadSanitizer bloats the stack heavily. Evidence has been that the
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// default stack size isn't enough for some browser tests.
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return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux).
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#endif
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}
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} // namespace base
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