chromium/third_party/grpc/src/src/core/lib/promise/latch.h

// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef GRPC_SRC_CORE_LIB_PROMISE_LATCH_H
#define GRPC_SRC_CORE_LIB_PROMISE_LATCH_H

#include <grpc/support/port_platform.h>

#include <stdint.h>

#include <string>
#include <type_traits>
#include <utility>

#include "absl/strings/str_cat.h"

#include <grpc/support/log.h>

#include "src/core/lib/debug/trace.h"
#include "src/core/lib/promise/activity.h"
#include "src/core/lib/promise/intra_activity_waiter.h"
#include "src/core/lib/promise/poll.h"
#include "src/core/lib/promise/trace.h"

namespace grpc_core {

// Latch provides a single set waitable object.
// Initially the Latch is unset.
// It can be waited upon by the Wait method, which produces a Promise that
// resolves when the Latch is Set to a value of type T.
template <typename T>
class Latch { … };

// Specialization for void.
template <>
class Latch<void> { … };

LatchWaitPromise;

}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_LIB_PROMISE_LATCH_H