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Replace EventEngine::Promise with grpc_core::Notification (#31027)
* Replace EventEngine::Promise with grpc_core::Notification * remove promise.h * Automated change: Fix sanity tests * fix windows * fix iocp * fix client_test Co-authored-by: drfloob <drfloob@users.noreply.github.com>pull/31083/head
AJ Heller
2 years ago
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GitHub
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c0e5e35c7a
20 changed files with 131 additions and 203 deletions
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// Copyright 2021 The gRPC Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef GRPC_CORE_LIB_EVENT_ENGINE_PROMISE_H |
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#define GRPC_CORE_LIB_EVENT_ENGINE_PROMISE_H |
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#include <grpc/support/port_platform.h> |
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#include <grpc/support/log.h> |
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#include "src/core/lib/gprpp/sync.h" |
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namespace grpc_event_engine { |
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namespace experimental { |
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/// A minimal promise implementation.
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///
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/// This is light-duty, syntactical sugar around cv wait & signal, which is
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/// useful in some cases.
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/// TODO(ctiller): Find a new name for this type.
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template <typename T> |
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class Promise { |
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public: |
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Promise() = default; |
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// Initialize a default value that will be returned if WaitWithTimeout times
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// out
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explicit Promise(T&& val) : val_(val) {} |
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// The getter will wait until the setter has been called, and will return the
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// value passed during Set.
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T& Get() { |
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grpc_core::MutexLock lock(&mu_); |
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while (!set_) { |
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cv_.Wait(&mu_); |
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} |
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return val_; |
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} |
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// This setter can only be called exactly once without a Reset.
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// Will automatically unblock getters.
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void Set(T&& val) { |
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grpc_core::MutexLock lock(&mu_); |
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GPR_ASSERT(!set_); |
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val_ = std::move(val); |
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set_ = true; |
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cv_.SignalAll(); |
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} |
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// Can only be called after a set operation.
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void Reset() { |
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grpc_core::MutexLock lock(&mu_); |
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GPR_ASSERT(set_); |
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set_ = false; |
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} |
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private: |
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grpc_core::Mutex mu_; |
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grpc_core::CondVar cv_; |
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T val_; |
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bool set_ = false; |
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}; |
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} // namespace experimental
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} // namespace grpc_event_engine
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#endif // GRPC_CORE_LIB_EVENT_ENGINE_PROMISE_H
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