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| 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 | |
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