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// Copyright 2014 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/threading/platform_thread.h"
#include <errno.h>
#include <sched.h>
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/safe_strerror_posix.h"
#include "base/threading/thread_id_name_manager.h"
#include "base/threading/thread_restrictions.h"
#include "base/tracked_objects.h"
#if !defined(OS_NACL)
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#endif
namespace base {
namespace {
int ThreadNiceValue(ThreadPriority priority) {
switch (priority) {
case kThreadPriority_RealtimeAudio:
return -10;
case kThreadPriority_Background:
return 10;
case kThreadPriority_Normal:
return 0;
case kThreadPriority_Display:
return -6;
default:
NOTREACHED() << "Unknown priority.";
return 0;
}
}
} // namespace
// static
void PlatformThread::SetName(const char* name) {
ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
tracked_objects::ThreadData::InitializeThreadContext(name);
#if !defined(OS_NACL)
// On FreeBSD 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;
setproctitle("%s", name);
#endif // !defined(OS_NACL)
}
// static
void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
ThreadPriority priority) {
#if !defined(OS_NACL)
if (priority == kThreadPriority_RealtimeAudio) {
const struct sched_param kRealTimePrio = { 8 };
if (pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0) {
// Got real time priority, no need to set nice level.
return;
}
}
// setpriority(2) will set a thread's priority if it is passed a tid as
// the 'process identifier', not affecting the rest of the threads in the
// process. Setting this priority will only succeed if the user has been
// granted permission to adjust nice values on the system.
DCHECK_NE(handle.id_, kInvalidThreadId);
const int kNiceSetting = ThreadNiceValue(priority);
if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting)) {
DVPLOG(1) << "Failed to set nice value of thread ("
<< handle.id_ << ") to " << kNiceSetting;
}
#endif // !defined(OS_NACL)
}
void InitThreading() {}
void InitOnThread() {}
void TerminateOnThread() {}
size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
#if !defined(THREAD_SANITIZER)
return 0;
#else
// ThreadSanitizer bloats the stack heavily. Evidence has been that the
// default stack size isn't enough for some browser tests.
return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux).
#endif
}
} // namespace base
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