contrib/libs/aws-sdk-cpp/aws-cpp-sdk-core/source/utils/threading/Semaphore.cpp


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/**
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0.
 */

#include <aws/core/utils/threading/Semaphore.h>
#include <algorithm>

using namespace Aws::Utils::Threading;

Semaphore::Semaphore(size_t initialCount, size_t maxCount)
    : m_count(initialCount), m_maxCount(maxCount)
{
}

void Semaphore::WaitOne()
{
    std::unique_lock<std::mutex> locker(m_mutex);
    if(0 == m_count)
    {
        m_syncPoint.wait(locker, [this] { return m_count > 0; });
    }
    --m_count;
}

void Semaphore::Release()
{
    std::lock_guard<std::mutex> locker(m_mutex);
    m_count = (std::min)(m_maxCount, m_count + 1);
    m_syncPoint.notify_one();
}

void Semaphore::ReleaseAll()
{    
    std::lock_guard<std::mutex> locker(m_mutex);
    m_count = m_maxCount;
    m_syncPoint.notify_all();
}