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64 lines
1.8 KiB
64 lines
1.8 KiB
// Copyright 2015 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <brillo/message_loops/message_loop.h>
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#include <base/lazy_instance.h>
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#include <base/logging.h>
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#include <base/threading/thread_local.h>
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namespace brillo {
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namespace {
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// A lazily created thread local storage for quick access to a thread's message
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// loop, if one exists. This should be safe and free of static constructors.
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base::LazyInstance<base::ThreadLocalPointer<MessageLoop> >::Leaky lazy_tls_ptr =
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LAZY_INSTANCE_INITIALIZER;
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} // namespace
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const MessageLoop::TaskId MessageLoop::kTaskIdNull = 0;
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MessageLoop* MessageLoop::current() {
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DCHECK(lazy_tls_ptr.Pointer()->Get() != nullptr) <<
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"There isn't a MessageLoop for this thread. You need to initialize it "
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"first.";
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return lazy_tls_ptr.Pointer()->Get();
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}
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bool MessageLoop::ThreadHasCurrent() {
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return lazy_tls_ptr.Pointer()->Get() != nullptr;
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}
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void MessageLoop::SetAsCurrent() {
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DCHECK(lazy_tls_ptr.Pointer()->Get() == nullptr) <<
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"There's already a MessageLoop for this thread.";
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lazy_tls_ptr.Pointer()->Set(this);
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}
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void MessageLoop::ReleaseFromCurrent() {
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DCHECK(lazy_tls_ptr.Pointer()->Get() == this) <<
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"This is not the MessageLoop bound to the current thread.";
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lazy_tls_ptr.Pointer()->Set(nullptr);
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}
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MessageLoop::~MessageLoop() {
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if (lazy_tls_ptr.Pointer()->Get() == this)
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lazy_tls_ptr.Pointer()->Set(nullptr);
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}
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void MessageLoop::Run() {
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// Default implementation is to call RunOnce() blocking until there aren't
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// more tasks scheduled.
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while (!should_exit_ && RunOnce(true)) {}
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should_exit_ = false;
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}
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void MessageLoop::BreakLoop() {
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should_exit_ = true;
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}
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} // namespace brillo
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