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// Copyright 2017 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/scoped_blocking_call.h"
#include "base/lazy_instance.h"
#include "base/threading/thread_local.h"
#include "base/threading/thread_restrictions.h"
#include "base/time/time.h"
#include "base/trace_event/base_tracing.h"
#include "build/build_config.h"
namespace base {
namespace {
#if DCHECK_IS_ON()
// Used to verify that the trace events used in the constructor do not result in
// instantiating a ScopedBlockingCall themselves (which would cause an infinite
// reentrancy loop).
LazyInstance<ThreadLocalBoolean>::Leaky tls_construction_in_progress =
LAZY_INSTANCE_INITIALIZER;
#endif
} // namespace
ScopedBlockingCall::ScopedBlockingCall(const Location& from_here,
BlockingType blocking_type)
: UncheckedScopedBlockingCall(
from_here,
blocking_type,
UncheckedScopedBlockingCall::BlockingCallType::kRegular) {
#if DCHECK_IS_ON()
DCHECK(!tls_construction_in_progress.Get().Get());
tls_construction_in_progress.Get().Set(true);
#endif
internal::AssertBlockingAllowed();
TRACE_EVENT_BEGIN2("base", "ScopedBlockingCall", "file_name",
from_here.file_name(), "function_name",
from_here.function_name());
#if DCHECK_IS_ON()
tls_construction_in_progress.Get().Set(false);
#endif
}
ScopedBlockingCall::~ScopedBlockingCall() {
TRACE_EVENT_END0("base", "ScopedBlockingCall");
}
namespace internal {
ScopedBlockingCallWithBaseSyncPrimitives::
ScopedBlockingCallWithBaseSyncPrimitives(const Location& from_here,
BlockingType blocking_type)
: UncheckedScopedBlockingCall(
from_here,
blocking_type,
UncheckedScopedBlockingCall::BlockingCallType::kBaseSyncPrimitives) {
#if DCHECK_IS_ON()
DCHECK(!tls_construction_in_progress.Get().Get());
tls_construction_in_progress.Get().Set(true);
#endif
internal::AssertBaseSyncPrimitivesAllowed();
TRACE_EVENT_BEGIN2("base", "ScopedBlockingCallWithBaseSyncPrimitives",
"file_name", from_here.file_name(), "function_name",
from_here.function_name());
#if DCHECK_IS_ON()
tls_construction_in_progress.Get().Set(false);
#endif
}
ScopedBlockingCallWithBaseSyncPrimitives::
~ScopedBlockingCallWithBaseSyncPrimitives() {
TRACE_EVENT_END0("base", "ScopedBlockingCallWithBaseSyncPrimitives");
}
} // namespace internal
} // namespace base
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