Aegisub/libaegisub/osx/dispatch.mm

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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "libaegisub/dispatch.h"
#include <dispatch/dispatch.h>
#include <mutex>
namespace {
using namespace agi::dispatch;
std::function<void (Thunk)> invoke_main;
struct OSXQueue : Queue {
virtual void DoSync(Thunk thunk)=0;
};
struct MainQueue final : OSXQueue {
void DoInvoke(Thunk thunk) override { invoke_main(thunk); }
void DoSync(Thunk thunk) override {
std::mutex m;
std::condition_variable cv;
std::unique_lock<std::mutex> l(m);
std::exception_ptr e;
bool done = false;
invoke_main([&]{
std::unique_lock<std::mutex> l(m);
try {
thunk();
}
catch (...) {
e = std::current_exception();
}
done = true;
cv.notify_all();
});
cv.wait(l, [&]{ return done; });
if (e) std::rethrow_exception(e);
}
};
struct GCDQueue final : OSXQueue {
dispatch_queue_t queue;
GCDQueue(dispatch_queue_t queue) : queue(queue) { }
~GCDQueue() { dispatch_release(queue); }
void DoInvoke(Thunk thunk) override {
dispatch_async(queue, ^{
try {
thunk();
}
catch (...) {
auto e = std::current_exception();
invoke_main([=] { std::rethrow_exception(e); });
}
});
}
void DoSync(Thunk thunk) override {
std::exception_ptr e;
std::exception_ptr *e_ptr = &e;
dispatch_sync(queue, ^{
try {
thunk();
}
catch (...) {
*e_ptr = std::current_exception();
}
});
if (e) std::rethrow_exception(e);
}
};
}
namespace agi { namespace dispatch {
void Init(std::function<void (Thunk)> invoke_main) {
::invoke_main = std::move(invoke_main);
}
void Queue::Async(Thunk thunk) { DoInvoke(std::move(thunk)); }
void Queue::Sync(Thunk thunk) { static_cast<OSXQueue *>(this)->DoSync(std::move(thunk)); }
Queue& Main() {
static MainQueue q;
return q;
}
Queue& Background() {
static GCDQueue q(dispatch_get_global_queue(0, DISPATCH_QUEUE_PRIORITY_DEFAULT));
return q;
}
std::unique_ptr<Queue> Create() {
return std::unique_ptr<Queue>(new GCDQueue(dispatch_queue_create("Aegisub worker queue",
DISPATCH_QUEUE_SERIAL)));
}
} }