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// Copyright 2022 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.
#include <grpc/support/port_platform.h>
#include "src/core/lib/promise/sleep.h"
#include <utility>
#include <grpc/event_engine/event_engine.h>
#include "src/core/lib/event_engine/default_event_engine.h" // IWYU pragma: keep
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/promise/activity.h"
#include "src/core/lib/promise/context.h"
#include "src/core/lib/promise/poll.h"
namespace grpc_core {
using ::grpc_event_engine::experimental::EventEngine;
Sleep::Sleep(Timestamp deadline) : deadline_(deadline) {}
Sleep::~Sleep() {
if (closure_ != nullptr) closure_->Cancel();
}
Poll<y_absl::Status> Sleep::operator()() {
// Invalidate now so that we see a fresh version of the time.
// TODO(ctiller): the following can be safely removed when we remove ExecCtx.
ExecCtx::Get()->InvalidateNow();
// If the deadline is earlier than now we can just return.
if (deadline_ <= Timestamp::Now()) return y_absl::OkStatus();
if (closure_ == nullptr) {
// TODO(ctiller): it's likely we'll want a pool of closures - probably per
// cpu? - to avoid allocating/deallocating on fast paths.
closure_ = new ActiveClosure(deadline_);
}
if (closure_->HasRun()) return y_absl::OkStatus();
return Pending{};
}
Sleep::ActiveClosure::ActiveClosure(Timestamp deadline)
: waker_(Activity::current()->MakeOwningWaker()),
timer_handle_(GetContext<EventEngine>()->RunAfter(
deadline - Timestamp::Now(), this)) {}
void Sleep::ActiveClosure::Run() {
ApplicationCallbackExecCtx callback_exec_ctx;
ExecCtx exec_ctx;
auto waker = std::move(waker_);
if (Unref()) {
delete this;
} else {
waker.Wakeup();
}
}
void Sleep::ActiveClosure::Cancel() {
// If we cancel correctly then we must own both refs still and can simply
// delete without unreffing twice, otherwise try unreffing since this may be
// the last owned ref.
if (HasRun() || GetContext<EventEngine>()->Cancel(timer_handle_) || Unref()) {
delete this;
}
}
bool Sleep::ActiveClosure::Unref() {
return (refs_.fetch_sub(1, std::memory_order_acq_rel) == 1);
}
bool Sleep::ActiveClosure::HasRun() const {
// If the closure has run (ie woken up the activity) then it will have
// decremented this ref count once.
return refs_.load(std::memory_order_acquire) == 1;
}
} // namespace grpc_core
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