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// Copyright 2016 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.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_SYNC_HANDLE_REGISTRY_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_SYNC_HANDLE_REGISTRY_H_
#include <unordered_map>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "mojo/public/cpp/system/core.h"
namespace mojo {
namespace internal {
// SyncHandleRegistry is a thread-local storage to register handles that want to
// be watched together.
//
// This class is not thread safe.
class SyncHandleRegistry : public base::RefCounted<SyncHandleRegistry> {
public:
// Returns a thread-local object.
static scoped_refptr<SyncHandleRegistry> current();
using HandleCallback = base::Callback<void(MojoResult)>;
bool RegisterHandle(const Handle& handle,
MojoHandleSignals handle_signals,
const HandleCallback& callback);
void UnregisterHandle(const Handle& handle);
// Waits on all the registered handles and runs callbacks synchronously for
// those ready handles.
// The method:
// - returns true when any element of |should_stop| is set to true;
// - returns false when any error occurs.
bool WatchAllHandles(const bool* should_stop[], size_t count);
private:
friend class base::RefCounted<SyncHandleRegistry>;
struct HandleHasher {
size_t operator()(const Handle& handle) const {
return std::hash<uint32_t>()(static_cast<uint32_t>(handle.value()));
}
};
using HandleMap = std::unordered_map<Handle, HandleCallback, HandleHasher>;
SyncHandleRegistry();
~SyncHandleRegistry();
HandleMap handles_;
ScopedHandle wait_set_handle_;
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(SyncHandleRegistry);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_SYNC_HANDLE_REGISTRY_H_
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