base/threading/platform_thread_freebsd.cc

   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/threading/thread_id_name_manager.h"
  13 #include "base/tracked_objects.h"
  14
  15 #if !defined(OS_NACL)
  16 #include <pthread.h>
  17 #include <sys/prctl.h>
  18 #include <sys/types.h>
  19 #include <unistd.h>
  20 #endif
  21
  22 namespace base {
  23
  24 namespace internal {
  25
  26 namespace {
  27 #if !defined(OS_NACL)
  28 const struct sched_param kRealTimePrio = {8};
  29 #endif
  30 }  // namespace
  31
  32 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
  33     {ThreadPriority::BACKGROUND, 10},
  34     {ThreadPriority::NORMAL, 0},
  35     {ThreadPriority::DISPLAY, -6},
  36     {ThreadPriority::REALTIME_AUDIO, -10},
  37 }
  38
  39 bool SetThreadPriorityForPlatform(PlatformThreadHandle handle,
  40                                   ThreadPriority priority) {
  41 #if !defined(OS_NACL)
  42   // TODO(gab): Assess the correctness of using |pthread_self()| below instead
  43   // of |handle|. http://crbug.com/468793.
  44   return priority == ThreadPriority::REALTIME_AUDIO &&
  45          pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
  46 #else
  47   return false;
  48 #endif
  49 }
  50
  51 bool GetThreadPriorityForPlatform(PlatformThreadHandle handle,
  52                                   ThreadPriority* priority) {
  53 #if !defined(OS_NACL)
  54   // TODO(gab): Assess the correctness of using |pthread_self()| below instead
  55   // of |handle|. http://crbug.com/468793.
  56   int maybe_sched_rr = 0;
  57   struct sched_param maybe_realtime_prio = {0};
  58   if (pthread_getschedparam(pthread_self(), &maybe_sched_rr,
  59                             &maybe_realtime_prio) == 0 &&
  60       maybe_sched_rr == SCHED_RR &&
  61       maybe_realtime_prio.sched_priority == kRealTimePrio.sched_priority) {
  62     *priority = ThreadPriority::REALTIME_AUDIO;
  63     return true;
  64   }
  65 #endif
  66   return false;
  67 }
  68
  69 }  // namespace internal
  70
  71 // static
  72 void PlatformThread::SetName(const std::string& name) {
  73   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
  74   tracked_objects::ThreadData::InitializeThreadContext(name);
  75
  76 #if !defined(OS_NACL)
  77   // On FreeBSD we can get the thread names to show up in the debugger by
  78   // setting the process name for the LWP.  We don't want to do this for the
  79   // main thread because that would rename the process, causing tools like
  80   // killall to stop working.
  81   if (PlatformThread::CurrentId() == getpid())
  82     return;
  83   setproctitle("%s", name.c_str());
  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