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// Copyright (c) 2012 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_LINUX)
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <unistd.h>
#endif
namespace base {
namespace {
int ThreadNiceValue(ThreadPriority priority) {
static const int threadPriorityAudio = -10;
static const int threadPriorityBackground = 10;
static const int threadPriorityDefault = 0;
static const int threadPriorityDisplay = -6;
switch (priority) {
case kThreadPriority_RealtimeAudio:
return threadPriorityAudio;
case kThreadPriority_Background:
return threadPriorityBackground;
case kThreadPriority_Normal:
return threadPriorityDefault;
case kThreadPriority_Display:
return threadPriorityDisplay;
default:
NOTREACHED() << "Unknown priority.";
return 0;
}
}
} // namespace
// static
void PlatformThread::SetName(const char* name) {
ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
tracked_objects::ThreadData::InitializeThreadContext(name);
#ifndef OS_NACL
// On linux 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;
// http://0pointer.de/blog/projects/name-your-threads.html
// Set the name for the LWP (which gets truncated to 15 characters).
// Note that glibc also has a 'pthread_setname_np' api, but it may not be
// available everywhere and it's only benefit over using prctl directly is
// that it can set the name of threads other than the current thread.
int err = prctl(PR_SET_NAME, name);
// We expect EPERM failures in sandboxed processes, just ignore those.
if (err < 0 && errno != EPERM)
DPLOG(ERROR) << "prctl(PR_SET_NAME)";
#endif
}
// static
void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
ThreadPriority priority) {
#ifndef OS_NACL
// 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);
int kNiceSetting = ThreadNiceValue(priority);
if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting))
LOG(ERROR) << "Failed to set nice value of thread to " << kNiceSetting;
#endif
}
void InitThreading() {
}
void InitOnThread() {
}
void TerminateOnThread() {
}
size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
return 0;
}
} // namespace base
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