ecs/src/core/utils/thread_pool/task_queue.cpp

#include <ecs/core/utils/fixed_function.inl>
#include <ecs/core/utils/thread_pool/task_queue.inl>

using namespace ::ecs::core::utils;

concurrent_task_queue
    ::concurrent_task_queue()
        : _count        (0)
        , _inner_queue  ()
        { }

void concurrent_task_queue
    ::push(task&& t)
{
    if (!_inner_queue.enqueue(std::move(t)))
    {
        throw std::overflow_error("task queue is out of memory");
    }
    _count++;
}

bool concurrent_task_queue
    ::pop(task& t)
{
    ssize_t old_count = _count.load(std::memory_order_relaxed);
    while (old_count > 0)
    {
        if (_count.compare_exchange_weak(old_count, old_count - 1, std::memory_order_acquire, std::memory_order_relaxed))
        {
            while (!_inner_queue.try_dequeue(t))
            {
                continue;
            }
            return true;
        }
    }
    return false;
}