4f381f6d07
* bump abseil to 20250814 * bump protobuf to v32.0 * cmake: add ccache auto support * backport flatzinc, math_opt and sat update
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
// Copyright 2010-2025 Google LLC
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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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#include "ortools/util/python/py_solve_interrupter.h"
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#include <memory>
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#include <utility>
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#include <vector>
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#include "absl/base/nullability.h"
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#include "absl/log/log.h"
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#include "absl/synchronization/mutex.h"
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namespace operations_research {
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PySolveInterrupter::PySolveInterrupter()
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: callback_(&interrupter_, [this]() { TriggerTargets(); }) {}
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std::vector<absl_nonnull std::shared_ptr<PySolveInterrupter>>
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PySolveInterrupter::CleanupAndGetTargets(
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const PySolveInterrupter* absl_nullable const to_remove) {
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// First get strong references of non-expired targets. Also filter the
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// to_remove target if found.
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std::vector<absl_nonnull std::shared_ptr<PySolveInterrupter>>
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non_expired_targets;
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non_expired_targets.reserve(targets_.size());
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for (std::weak_ptr<PySolveInterrupter>& weak_target : targets_) {
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std::shared_ptr<PySolveInterrupter> strong_target = weak_target.lock();
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if (strong_target != nullptr && strong_target.get() != to_remove) {
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non_expired_targets.push_back(std::move(strong_target));
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}
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}
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// Then recreates targets weak-references with only the non-expired targets.
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//
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// Note that we could be more efficient by doing the cleanup in-place but here
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// we keep the code simple. In practice the number of targets_ is expected to
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// be very low (less than 10).
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targets_.clear();
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for (std::shared_ptr<PySolveInterrupter>& strong_target :
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non_expired_targets) {
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targets_.push_back(strong_target);
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}
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return non_expired_targets;
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}
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void PySolveInterrupter::AddTriggerTarget(
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absl_nonnull std::shared_ptr<PySolveInterrupter> target) {
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const absl::MutexLock lock(mutex_);
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CleanupAndGetTargets();
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// Note that we don't test if targets_ already contain the interrupter as
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// interrupter are triggerable only once. Thus having duplicates won't result
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// in visible changes outside.
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//
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// The way RemoveTriggerTarget() is implemented will remove duplicates as
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// well.
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targets_.push_back(std::move(target));
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}
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void PySolveInterrupter::RemoveTriggerTarget(
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absl_nonnull std::shared_ptr<PySolveInterrupter> target) {
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const absl::MutexLock lock(mutex_);
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CleanupAndGetTargets(/*to_remove=*/target.get());
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}
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void PySolveInterrupter::TriggerTargets() {
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std::vector<absl_nonnull std::shared_ptr<PySolveInterrupter>> targets;
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{ // Limit `lock` scope.
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const absl::MutexLock lock(mutex_);
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targets = CleanupAndGetTargets();
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}
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// Call targets without holding mutex_.
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for (const absl_nonnull std::shared_ptr<PySolveInterrupter>& target :
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targets) {
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target->Interrupt();
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}
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}
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} // namespace operations_research
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