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5984d8d1a8
Bug: dawn:824 Change-Id: Ie39d4f622bfb3dcc3a74b03d594efcea7139a9dc Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/75069 Reviewed-by: Austin Eng <enga@chromium.org> Reviewed-by: Loko Kung <lokokung@google.com> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// Copyright 2021 The Dawn 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 DAWNWIRE_CLIENT_REQUESTTRACKER_H_
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#define DAWNWIRE_CLIENT_REQUESTTRACKER_H_
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#include "common/Assert.h"
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#include "common/NonCopyable.h"
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#include <cstdint>
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#include <map>
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namespace dawn_wire { namespace client {
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class Device;
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class MemoryTransferService;
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template <typename Request>
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class RequestTracker : NonCopyable {
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public:
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~RequestTracker() {
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ASSERT(mRequests.empty());
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}
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uint64_t Add(Request&& request) {
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mSerial++;
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mRequests.emplace(mSerial, request);
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return mSerial;
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}
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bool Acquire(uint64_t serial, Request* request) {
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auto it = mRequests.find(serial);
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if (it == mRequests.end()) {
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return false;
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}
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*request = std::move(it->second);
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mRequests.erase(it);
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return true;
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}
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template <typename CloseFunc>
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void CloseAll(CloseFunc&& closeFunc) {
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// Call closeFunc on all requests while handling reentrancy where the callback of some
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// requests may add some additional requests. We guarantee all callbacks for requests
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// are called exactly onces, so keep closing new requests if the first batch added more.
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// It is fine to loop infinitely here if that's what the application makes use do.
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while (!mRequests.empty()) {
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// Move mRequests to a local variable so that further reentrant modifications of
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// mRequests don't invalidate the iterators.
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auto allRequests = std::move(mRequests);
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for (auto& [_, request] : allRequests) {
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closeFunc(&request);
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}
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}
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}
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template <typename F>
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void ForAll(F&& f) {
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for (auto& [_, request] : mRequests) {
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f(&request);
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}
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}
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private:
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uint64_t mSerial;
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std::map<uint64_t, Request> mRequests;
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};
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}} // namespace dawn_wire::client
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#endif // DAWNWIRE_CLIENT_REQUESTTRACKER_H_
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