117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
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// 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/memory/scoped_ptr.h"
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#include "base/safe_strerror_posix.h"
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#include "base/threading/thread_id_name_manager.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/tracked_objects.h"
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#if !defined(OS_NACL)
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#include <sys/prctl.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <unistd.h>
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#endif
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namespace base {
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namespace {
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int ThreadNiceValue(ThreadPriority priority) {
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static const int threadPriorityAudio = -10;
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static const int threadPriorityBackground = 10;
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static const int threadPriorityDefault = 0;
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static const int threadPriorityDisplay = -6;
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switch (priority) {
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case kThreadPriority_RealtimeAudio:
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return threadPriorityAudio;
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case kThreadPriority_Background:
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return threadPriorityBackground;
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case kThreadPriority_Normal:
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return threadPriorityDefault;
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case kThreadPriority_Display:
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return threadPriorityDisplay;
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default:
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NOTREACHED() << "Unknown priority.";
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return 0;
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}
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}
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} // namespace
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// static
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void PlatformThread::SetName(const char* name) {
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ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
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tracked_objects::ThreadData::InitializeThreadContext(name);
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#ifndef 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);
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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
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}
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// static
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void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
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ThreadPriority priority) {
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#if !defined(OS_NACL)
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if (priority == kThreadPriority_RealtimeAudio) {
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const int kRealTimePrio = 8;
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struct sched_param sched_param;
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memset(&sched_param, 0, sizeof(sched_param));
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sched_param.sched_priority = kRealTimePrio;
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if (pthread_setschedparam(pthread_self(), SCHED_RR, &sched_param) == 0) {
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// Got real time priority, no need to set nice level.
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return;
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}
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}
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// setpriority(2) will set a thread's priority if it is passed a tid as
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// the 'process identifier', not affecting the rest of the threads in the
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// process. Setting this priority will only succeed if the user has been
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// granted permission to adjust nice values on the system.
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DCHECK_NE(handle.id_, kInvalidThreadId);
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int kNiceSetting = ThreadNiceValue(priority);
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if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting))
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LOG(ERROR) << "Failed to set nice value of thread to " << kNiceSetting;
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#endif // !OS_NACL
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}
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void InitThreading() {
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}
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void InitOnThread() {
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}
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void TerminateOnThread() {
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}
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size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
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return 0;
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}
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} // namespace base
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