2016-01-18 15:33:29 +00:00
|
|
|
// Copyright (c) 2011-2016 The Cryptonote developers
|
2015-09-18 11:55:31 +00:00
|
|
|
// Distributed under the MIT/X11 software license, see the accompanying
|
|
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
2015-08-19 17:06:24 +00:00
|
|
|
|
|
|
|
#pragma once
|
|
|
|
|
|
|
|
#include <cassert>
|
|
|
|
#include <System/Dispatcher.h>
|
|
|
|
#include <System/Event.h>
|
|
|
|
#include <System/Future.h>
|
|
|
|
#include <System/InterruptedException.h>
|
|
|
|
|
|
|
|
namespace System {
|
|
|
|
|
|
|
|
template<class T = void> class RemoteContext {
|
|
|
|
public:
|
|
|
|
// Start a thread, execute operation in it, continue execution of current context.
|
|
|
|
RemoteContext(Dispatcher& d, std::function<T()>&& operation)
|
|
|
|
: dispatcher(d), event(d), procedure(std::move(operation)), future(System::Detail::async<T>([this] { return asyncProcedure(); })), interrupted(false) {
|
|
|
|
}
|
|
|
|
|
|
|
|
// Run other task on dispatcher until future is ready, then return lambda's result, or rethrow exception. UB if called more than once.
|
|
|
|
T get() const {
|
|
|
|
wait();
|
|
|
|
return future.get();
|
|
|
|
}
|
|
|
|
|
|
|
|
// Run other task on dispatcher until future is ready.
|
|
|
|
void wait() const {
|
|
|
|
while (!event.get()) {
|
|
|
|
try {
|
|
|
|
event.wait();
|
|
|
|
} catch (InterruptedException&) {
|
|
|
|
interrupted = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (interrupted) {
|
|
|
|
dispatcher.interrupt();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Wait future to complete.
|
|
|
|
~RemoteContext() {
|
|
|
|
try {
|
|
|
|
wait();
|
|
|
|
} catch (std::exception&) {
|
|
|
|
}
|
|
|
|
|
|
|
|
try {
|
|
|
|
// windows future implementation doesn't wait for completion on destruction
|
|
|
|
if (future.valid()) {
|
|
|
|
future.wait();
|
|
|
|
}
|
|
|
|
} catch (std::exception&) {
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
private:
|
|
|
|
struct NotifyOnDestruction {
|
|
|
|
NotifyOnDestruction(Dispatcher& d, Event& e) : dispatcher(d), event(e) {
|
|
|
|
}
|
|
|
|
|
|
|
|
~NotifyOnDestruction() {
|
|
|
|
// make a local copy; event reference will be dead when function is called
|
|
|
|
auto localEvent = &event;
|
|
|
|
// die if this throws...
|
|
|
|
dispatcher.remoteSpawn([=] { localEvent->set(); });
|
|
|
|
}
|
|
|
|
|
|
|
|
Dispatcher& dispatcher;
|
|
|
|
Event& event;
|
|
|
|
};
|
|
|
|
|
|
|
|
// This function is executed in future object
|
|
|
|
T asyncProcedure() {
|
|
|
|
NotifyOnDestruction guard(dispatcher, event);
|
|
|
|
assert(procedure != nullptr);
|
|
|
|
return procedure();
|
|
|
|
}
|
|
|
|
|
|
|
|
Dispatcher& dispatcher;
|
|
|
|
mutable Event event;
|
|
|
|
std::function<T()> procedure;
|
|
|
|
mutable System::Detail::Future<T> future;
|
|
|
|
mutable bool interrupted;
|
|
|
|
};
|
|
|
|
|
|
|
|
}
|