base/threading/platform_thread_linux.cc

   1 // Copyright (c) 2012 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/platform_thread_internal_posix.h"
  13 #include "base/threading/thread_id_name_manager.h"
  14 #include "base/tracked_objects.h"
  15
  16 #if !defined(OS_NACL)
  17 #include <pthread.h>
  18 #include <sys/prctl.h>
  19 #include <sys/types.h>
  20 #include <unistd.h>
  21 #endif
  22
  23 namespace base {
  24
  25 namespace internal {
  26
  27 namespace {
  28 #if !defined(OS_NACL)
  29 const struct sched_param kRealTimePrio = {8};
  30 #endif
  31 }  // namespace
  32
  33 const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
  34     {kThreadPriority_RealtimeAudio, -10},
  35     {kThreadPriority_Background, 10},
  36     {kThreadPriority_Normal, 0},
  37     {kThreadPriority_Display, -6},
  38 };
  39
  40 bool HandleSetThreadPriorityForPlatform(PlatformThreadHandle handle,
  41                                         ThreadPriority priority) {
  42 #if !defined(OS_NACL)
  43   return priority == kThreadPriority_RealtimeAudio &&
  44          pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
  45 #else
  46   return false;
  47 #endif
  48 }
  49
  50 }  // namespace internal
  51
  52 // static
  53 void PlatformThread::SetName(const char* name) {
  54   ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
  55   tracked_objects::ThreadData::InitializeThreadContext(name);
  56
  57 #if !defined(OS_NACL)
  58   // On linux we can get the thread names to show up in the debugger by setting
  59   // the process name for the LWP.  We don't want to do this for the main
  60   // thread because that would rename the process, causing tools like killall
  61   // to stop working.
  62   if (PlatformThread::CurrentId() == getpid())
  63     return;
  64
  65   // http://0pointer.de/blog/projects/name-your-threads.html
  66   // Set the name for the LWP (which gets truncated to 15 characters).
  67   // Note that glibc also has a 'pthread_setname_np' api, but it may not be
  68   // available everywhere and it's only benefit over using prctl directly is
  69   // that it can set the name of threads other than the current thread.
  70   int err = prctl(PR_SET_NAME, name);
  71   // We expect EPERM failures in sandboxed processes, just ignore those.
  72   if (err < 0 && errno != EPERM)
  73     DPLOG(ERROR) << "prctl(PR_SET_NAME)";
  74 #endif  //  !defined(OS_NACL)
  75 }
  76
  77 void InitThreading() {}
  78
  79 void InitOnThread() {}
  80
  81 void TerminateOnThread() {}
  82
  83 size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes) {
  84 #if !defined(THREAD_SANITIZER)
  85   return 0;
  86 #else
  87   // ThreadSanitizer bloats the stack heavily. Evidence has been that the
  88   // default stack size isn't enough for some browser tests.
  89   return 2 * (1 << 23);  // 2 times 8192K (the default stack size on Linux).
  90 #endif
  91 }
  92
  93 }  // namespace base