58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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*/
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#include <folly/fibers/BatchSemaphore.h>
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namespace folly {
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namespace fibers {
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void BatchSemaphore::signal(int64_t tokens) {
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auto oldVal = tokens_.load(std::memory_order_acquire);
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do {
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if (signalSlow(tokens, oldVal)) {
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return;
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}
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oldVal = tokens_.load(std::memory_order_acquire);
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} while (!tokens_.compare_exchange_weak(
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oldVal,
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oldVal + tokens,
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std::memory_order_release,
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std::memory_order_acquire));
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}
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void BatchSemaphore::wait(int64_t tokens) {
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wait_common(tokens);
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}
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bool BatchSemaphore::try_wait(Waiter& waiter, int64_t tokens) {
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return try_wait_common(waiter, tokens);
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}
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#if FOLLY_HAS_COROUTINES
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coro::Task<void> BatchSemaphore::co_wait(int64_t tokens) {
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co_await co_wait_common(tokens);
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}
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#endif
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SemiFuture<Unit> BatchSemaphore::future_wait(int64_t tokens) {
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return future_wait_common(tokens);
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}
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} // namespace fibers
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} // namespace folly
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