afb81b8278
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64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#include <crl/crl_on_main.h>
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#ifdef CRL_USE_COMMON_QUEUE
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#include <exception>
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namespace {
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crl::queue *Queue/* = nullptr*/;
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std::atomic<int> Counter/* = 0*/;
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crl::details::main_queue_pointer Lifetime;
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} // namespace
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namespace crl::details {
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void main_queue_pointer::grab() {
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auto counter = Counter.load(std::memory_order_acquire);
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while (true) {
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if (!counter) {
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return;
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} else if (Counter.compare_exchange_weak(counter, counter + 1)) {
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_pointer = Queue;
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return;
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}
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}
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}
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void main_queue_pointer::ungrab() {
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if (_pointer) {
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if (--Counter == 0) {
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delete _pointer;
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}
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_pointer = nullptr;
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}
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}
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void main_queue_pointer::create(main_queue_processor processor) {
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if (Counter.load(std::memory_order_acquire) != 0) {
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std::terminate();
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}
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Queue = new queue(processor);
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Counter.store(1, std::memory_order_release);
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_pointer = Queue;
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}
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} // namespace crl::details
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namespace crl {
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void init_main_queue(main_queue_processor processor) {
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Lifetime.create(processor);
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}
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} // namespace crl
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#endif // CRL_USE_COMMON_QUEUE
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