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43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <seastar/core/semaphore.hh>
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#include <seastar/core/shared_ptr.hh>
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class service_permit {
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seastar::lw_shared_ptr<seastar::semaphore_units<>> _permit;
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service_permit(seastar::semaphore_units<>&& u) : _permit(seastar::make_lw_shared<seastar::semaphore_units<>>(std::move(u))) {}
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friend service_permit make_service_permit(seastar::semaphore_units<>&& permit);
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friend service_permit empty_service_permit();
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public:
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size_t count() const { return _permit ? _permit->count() : 0; };
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};
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inline service_permit make_service_permit(seastar::semaphore_units<>&& permit) {
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return service_permit(std::move(permit));
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}
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inline service_permit empty_service_permit() {
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return make_service_permit(seastar::semaphore_units<>());
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}
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