mirror of
https://github.com/classilla/tenfourfox.git
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120 lines
3.8 KiB
C++
120 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/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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switch (priority) {
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case kThreadPriority_RealtimeAudio:
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return -10;
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case kThreadPriority_Background:
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return 10;
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case kThreadPriority_Normal:
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return 0;
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case kThreadPriority_Display:
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return -6;
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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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#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);
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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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// 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 struct sched_param kRealTimePrio = {8};
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if (pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 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) should change the whole thread group's (i.e. process)
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// priority. however, on linux it will only change the target thread's
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// priority. see the bugs section in
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// http://man7.org/linux/man-pages/man2/getpriority.2.html.
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// we prefer using 0 rather than the current thread id since they are
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// equivalent but it makes sandboxing easier (https://crbug.com/399473).
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DCHECK_NE(handle.id_, kInvalidThreadId);
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const int kNiceSetting = ThreadNiceValue(priority);
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const PlatformThreadId current_id = PlatformThread::CurrentId();
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if (setpriority(PRIO_PROCESS,
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handle.id_ == current_id ? 0 : handle.id_,
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kNiceSetting)) {
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DVPLOG(1) << "Failed to set nice value of thread (" << handle.id_ << ") to "
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<< kNiceSetting;
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}
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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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