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#include <mbgl/actor/mailbox.hpp>
#include <mbgl/actor/message.hpp>
#include <mbgl/actor/scheduler.hpp>
#include <cassert>
namespace mbgl {
Mailbox::Mailbox(Scheduler& scheduler_)
: scheduler(scheduler_) {
}
void Mailbox::push(std::unique_ptr<Message> message) {
assert(!closing);
std::lock_guard<std::mutex> queueLock(queueMutex);
bool wasEmpty = queue.empty();
queue.push(std::move(message));
if (wasEmpty) {
scheduler.schedule(shared_from_this());
}
}
void Mailbox::close() {
// Block until the scheduler is guaranteed not to be executing receive().
std::lock_guard<std::mutex> closingLock(closingMutex);
closing = true;
}
void Mailbox::receive() {
std::lock_guard<std::mutex> closingLock(closingMutex);
if (closing) {
return;
}
std::unique_ptr<Message> message;
bool wasEmpty;
{
std::lock_guard<std::mutex> queueLock(queueMutex);
assert(!queue.empty());
message = std::move(queue.front());
queue.pop();
wasEmpty = queue.empty();
}
(*message)();
if (!wasEmpty) {
scheduler.schedule(shared_from_this());
}
}
void Mailbox::maybeReceive(std::weak_ptr<Mailbox> mailbox) {
if (auto locked = mailbox.lock()) {
locked->receive();
}
}
} // namespace mbgl
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