59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
#include <mbgl/util/async_task.hpp>
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#include <CoreFoundation/CoreFoundation.h>
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#include <atomic>
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namespace mbgl {
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namespace util {
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class AsyncTask::Impl {
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public:
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Impl(std::function<void()>&& fn)
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: task(std::move(fn)),
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loop(CFRunLoopGetCurrent()) {
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CFRunLoopSourceContext context = {
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0, this, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, perform};
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source = CFRunLoopSourceCreate(kCFAllocatorDefault, 0, &context);
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CFRunLoopAddSource(loop, source, kCFRunLoopCommonModes);
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}
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~Impl() {
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CFRunLoopSourceInvalidate(source);
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CFRelease(source);
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}
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void maySend() {
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if (!queued.test_and_set()) {
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CFRunLoopSourceSignal(source);
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CFRunLoopWakeUp(loop);
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}
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}
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void runTask() {
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queued.clear();
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task();
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}
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private:
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static void perform(void* info) { reinterpret_cast<Impl*>(info)->runTask(); }
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std::function<void()> task;
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std::atomic_flag queued = ATOMIC_FLAG_INIT;
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CFRunLoopRef loop;
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CFRunLoopSourceRef source;
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};
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AsyncTask::AsyncTask(std::function<void()>&& fn)
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: impl(std::make_unique<Impl>(std::move(fn))) {}
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AsyncTask::~AsyncTask() = default;
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void AsyncTask::send() {
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impl->maySend();
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}
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} // namespace util
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} // namespace mbgl
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