base/threading/thread_restrictions.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/thread_restrictions.h"
   6
   7 #if ENABLE_THREAD_RESTRICTIONS
   8
   9 #include "base/lazy_instance.h"
  10 #include "base/logging.h"
  11 #include "base/threading/thread_local.h"
  12
  13 namespace base {
  14
  15 namespace {
  16
  17 LazyInstance<ThreadLocalBoolean>::Leaky
  18     g_io_disallowed = LAZY_INSTANCE_INITIALIZER;
  19
  20 LazyInstance<ThreadLocalBoolean>::Leaky
  21     g_singleton_disallowed = LAZY_INSTANCE_INITIALIZER;
  22
  23 LazyInstance<ThreadLocalBoolean>::Leaky
  24     g_wait_disallowed = LAZY_INSTANCE_INITIALIZER;
  25
  26 }  // anonymous namespace
  27
  28 // static
  29 bool ThreadRestrictions::SetIOAllowed(bool allowed) {
  30   bool previous_disallowed = g_io_disallowed.Get().Get();
  31   g_io_disallowed.Get().Set(!allowed);
  32   return !previous_disallowed;
  33 }
  34
  35 // static
  36 void ThreadRestrictions::AssertIOAllowed() {
  37   if (g_io_disallowed.Get().Get()) {
  38     LOG(FATAL) <<
  39         "Function marked as IO-only was called from a thread that "
  40         "disallows IO!  If this thread really should be allowed to "
  41         "make IO calls, adjust the call to "
  42         "base::ThreadRestrictions::SetIOAllowed() in this thread's "
  43         "startup.";
  44   }
  45 }
  46
  47 // static
  48 bool ThreadRestrictions::SetSingletonAllowed(bool allowed) {
  49   bool previous_disallowed = g_singleton_disallowed.Get().Get();
  50   g_singleton_disallowed.Get().Set(!allowed);
  51   return !previous_disallowed;
  52 }
  53
  54 // static
  55 void ThreadRestrictions::AssertSingletonAllowed() {
  56   if (g_singleton_disallowed.Get().Get()) {
  57     LOG(FATAL) << "LazyInstance/Singleton is not allowed to be used on this "
  58                << "thread.  Most likely it's because this thread is not "
  59                << "joinable, so AtExitManager may have deleted the object "
  60                << "on shutdown, leading to a potential shutdown crash.";
  61   }
  62 }
  63
  64 // static
  65 void ThreadRestrictions::DisallowWaiting() {
  66   g_wait_disallowed.Get().Set(true);
  67 }
  68
  69 // static
  70 void ThreadRestrictions::AssertWaitAllowed() {
  71   if (g_wait_disallowed.Get().Get()) {
  72     LOG(FATAL) << "Waiting is not allowed to be used on this thread to prevent"
  73                << "jank and deadlock.";
  74   }
  75 }
  76
  77 bool ThreadRestrictions::SetWaitAllowed(bool allowed) {
  78   bool previous_disallowed = g_wait_disallowed.Get().Get();
  79   g_wait_disallowed.Get().Set(!allowed);
  80   return !previous_disallowed;
  81 }
  82
  83 }  // namespace base
  84
  85 #endif  // ENABLE_THREAD_RESTRICTIONS