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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/threading/thread_restrictions.h"
#if DCHECK_IS_ON()
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/threading/thread_local.h"
namespace base {
namespace {
LazyInstance<ThreadLocalBoolean>::Leaky
g_io_disallowed = LAZY_INSTANCE_INITIALIZER;
LazyInstance<ThreadLocalBoolean>::Leaky
g_singleton_disallowed = LAZY_INSTANCE_INITIALIZER;
LazyInstance<ThreadLocalBoolean>::Leaky
g_wait_disallowed = LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
bool ThreadRestrictions::SetIOAllowed(bool allowed) {
bool previous_disallowed = g_io_disallowed.Get().Get();
g_io_disallowed.Get().Set(!allowed);
return !previous_disallowed;
}
// static
void ThreadRestrictions::AssertIOAllowed() {
if (g_io_disallowed.Get().Get()) {
NOTREACHED() << "Function marked as IO-only was called from a thread that "
"disallows IO! If this thread really should be allowed to "
"make IO calls, adjust the call to "
"base::ThreadRestrictions::SetIOAllowed() in this thread's "
"startup. If this task is running inside the "
"TaskScheduler, the TaskRunner used to post it needs to "
"have MayBlock() in its TaskTraits.";
}
}
// static
bool ThreadRestrictions::SetSingletonAllowed(bool allowed) {
bool previous_disallowed = g_singleton_disallowed.Get().Get();
g_singleton_disallowed.Get().Set(!allowed);
return !previous_disallowed;
}
// static
void ThreadRestrictions::AssertSingletonAllowed() {
if (g_singleton_disallowed.Get().Get()) {
NOTREACHED() << "LazyInstance/Singleton is not allowed to be used on this "
<< "thread. Most likely it's because this thread is not "
<< "joinable (or the current task is running with "
<< "TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN semantics), so "
<< "AtExitManager may have deleted the object on shutdown, "
<< "leading to a potential shutdown crash. If you need to use "
<< "the object from this context, it'll have to be updated to "
<< "use Leaky traits.";
}
}
// static
void ThreadRestrictions::DisallowWaiting() {
g_wait_disallowed.Get().Set(true);
}
// static
void ThreadRestrictions::AssertWaitAllowed() {
if (g_wait_disallowed.Get().Get()) {
NOTREACHED() << "Waiting is not allowed to be used on this thread to "
<< "prevent jank and deadlock. If this task is running "
"inside the TaskScheduler, the TaskRunner used to post it "
"needs to have WithBaseSyncPrimitives() in its TaskTraits.";
}
}
bool ThreadRestrictions::SetWaitAllowed(bool allowed) {
bool previous_disallowed = g_wait_disallowed.Get().Get();
g_wait_disallowed.Get().Set(!allowed);
return !previous_disallowed;
}
} // namespace base
#endif // DCHECK_IS_ON()
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