73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
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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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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#include "semaphore.hpp"
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#include "debug.hpp"
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#include "except.hpp"
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using util::threads::semaphore;
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///////////////////////////////////////////////////////////////////////////////
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semaphore::semaphore (unsigned value)
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{
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auto err = sem_init (&m_id, false, value);
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errno_error::try_code (err);
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}
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//-----------------------------------------------------------------------------
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semaphore::~semaphore ()
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{
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auto err = sem_destroy (&m_id);
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errno_error::try_code (err);
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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semaphore::wait (void)
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{
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auto err = sem_wait (&m_id);
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errno_error::try_code (err);
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}
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//-----------------------------------------------------------------------------
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bool
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semaphore::try_wait (void)
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{
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switch (auto err = sem_wait (&m_id)) {
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case 0: return true;
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case EAGAIN: return false;
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default:
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errno_error::throw_code (err);
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}
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unreachable ();
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}
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//-----------------------------------------------------------------------------
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void
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semaphore::post (void)
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{
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auto err = sem_post (&m_id);
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errno_error::try_code (err);
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}
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