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// SPDX-License-Identifier: GPL-2.0-or-later
#include "synchronizer.h"
#include <cassert>
namespace Inkscape::UI::Widget {
Synchronizer::Synchronizer()
{
dispatcher.connect([this] { on_dispatcher(); });
}
void Synchronizer::signalExit() const
{
auto lock = std::unique_lock(mutables);
awaken();
assert(slots.empty());
exitposted = true;
}
void Synchronizer::runInMain(std::function<void()> const &f) const
{
auto lock = std::unique_lock(mutables);
awaken();
auto s = Slot{ &f };
slots.emplace_back(&s);
assert(!exitposted);
slots_cond.wait(lock, [&] { return !s.func; });
}
void Synchronizer::waitForExit() const
{
auto lock = std::unique_lock(mutables);
main_blocked = true;
while (true) {
if (!slots.empty()) {
process_slots(lock);
} else if (exitposted) {
exitposted = false;
break;
}
main_cond.wait(lock);
}
main_blocked = false;
}
sigc::connection Synchronizer::connectExit(sigc::slot<void()> const &slot)
{
return signal_exit.connect(slot);
}
void Synchronizer::awaken() const
{
if (exitposted || !slots.empty()) {
return;
}
if (main_blocked) {
main_cond.notify_all();
} else {
const_cast<Glib::Dispatcher&>(dispatcher).emit(); // Glib::Dispatcher is const-incorrect.
}
}
void Synchronizer::on_dispatcher() const
{
auto lock = std::unique_lock(mutables);
if (!slots.empty()) {
process_slots(lock);
} else if (exitposted) {
exitposted = false;
lock.unlock();
signal_exit.emit();
}
}
void Synchronizer::process_slots(std::unique_lock<std::mutex> &lock) const
{
while (!slots.empty()) {
auto slots_grabbed = std::move(slots);
lock.unlock();
for (auto &s : slots_grabbed) {
(*s->func)();
}
lock.lock();
for (auto &s : slots_grabbed) {
s->func = nullptr;
}
slots_cond.notify_all();
}
}
} // namespace Inkscape::UI::Widget
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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