Home | History | Annotate | Download | only in threading 
      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/threading/platform_thread.h"
      6 
      7 #include <errno.h>
      8 #include <sched.h>
      9 
     10 #include "base/lazy_instance.h"
     11 #include "base/logging.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "base/safe_strerror_posix.h"
     14 #include "base/threading/thread_id_name_manager.h"
     15 #include "base/threading/thread_restrictions.h"
     16 #include "base/tracked_objects.h"
     17 
     18 #if !defined(OS_NACL)
     19 #include <sys/resource.h>
     20 #include <sys/syscall.h>
     21 #include <sys/time.h>
     22 #include <sys/types.h>
     23 #include <unistd.h>
     24 #endif
     25 
     26 namespace base {
     27 
     28 namespace {
     29 int ThreadNiceValue(ThreadPriority priority) {
     30   switch (priority) {
     31     case kThreadPriority_RealtimeAudio:
     32       return -10;
     33     case kThreadPriority_Background:
     34       return 10;
     35     case kThreadPriority_Normal:
     36       return 0;
     37     case kThreadPriority_Display:
     38       return -6;
     39     default:
     40       NOTREACHED() << "Unknown priority.";
     41       return 0;
     42   }
     43 }
     44 } // namespace
     45 
     46 // static
     47 void PlatformThread::SetName(const char* name) {
     48   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
     49   tracked_objects::ThreadData::InitializeThreadContext(name);
     50 
     51 #if !defined(OS_NACL)
     52   // On FreeBSD we can get the thread names to show up in the debugger by
     53   // setting the process name for the LWP.  We don't want to do this for the
     54   // main thread because that would rename the process, causing tools like
     55   // killall to stop working.
     56   if (PlatformThread::CurrentId() == getpid())
     57     return;
     58   setproctitle("%s", name);
     59 #endif  //  !defined(OS_NACL)
     60 }
     61 
     62 // static
     63 void PlatformThread::SetThreadPriority(PlatformThreadHandle handle,
     64                                        ThreadPriority priority) {
     65 #if !defined(OS_NACL)
     66   if (priority == kThreadPriority_RealtimeAudio) {
     67     const struct sched_param kRealTimePrio = { 8 };
     68     if (pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0) {
     69       // Got real time priority, no need to set nice level.
     70       return;
     71     }
     72   }
     73 
     74   // setpriority(2) will set a thread's priority if it is passed a tid as
     75   // the 'process identifier', not affecting the rest of the threads in the
     76   // process. Setting this priority will only succeed if the user has been
     77   // granted permission to adjust nice values on the system.
     78   DCHECK_NE(handle.id_, kInvalidThreadId);
     79   const int kNiceSetting = ThreadNiceValue(priority);
     80   if (setpriority(PRIO_PROCESS, handle.id_, kNiceSetting)) {
     81     DVPLOG(1) << "Failed to set nice value of thread ("
     82               << handle.id_ << ") to " << kNiceSetting;
     83   }
     84 #endif  //  !defined(OS_NACL)
     85 }
     86 
     87 void InitThreading() {}
     88 
     89 void InitOnThread() {}
     90 
     91 void TerminateOnThread() {}
     92 
     93 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
     94 #if !defined(THREAD_SANITIZER)
     95   return 0;
     96 #else
     97   // ThreadSanitizer bloats the stack heavily. Evidence has been that the
     98   // default stack size isn't enough for some browser tests.
     99   return 2 * (1 << 23);  // 2 times 8192K (the default stack size on Linux).
    100 #endif
    101 }
    102 
    103 }  // namespace base
    104