fix(gui): quit when emu thread exits first

lib/zba-gdbstub

@@ -1 +1 @@
-Subproject commit 5947747533ec9ee63b4598455a281edd5e55b4a9
+Subproject commit 479319e7cad78c3fd38b6865c56e9fe9e78d495c

src/core/emu.zig

@@ -18,12 +18,12 @@ pub const Synchro = struct {
     const AtomicBool = std.atomic.Atomic(bool);
 
     // UI -> Emulator
-    ui_busy: *AtomicBool,
-    paused: *AtomicBool, // FIXME: can ui_busy and paused be the same?
-    should_quit: *AtomicBool,
+    ui_busy: AtomicBool = AtomicBool.init(false),
+    paused: AtomicBool = AtomicBool.init(true), // FIXME: can ui_busy and paused be the same?
+    should_quit: AtomicBool = AtomicBool.init(false),
 
     // Emulator -> UI
-    did_pause: *AtomicBool,
+    did_pause: AtomicBool = AtomicBool.init(false),
 };
 
 /// 4 Cycles in 1 dot
@@ -52,7 +52,7 @@ const RunKind = enum {
     LimitedFPS,
 };
 
-pub fn run(cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: *Tracker, sync: Synchro) void {
+pub fn run(cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: *Tracker, sync: *Synchro) void {
     const audio_sync = config.config().guest.audio_sync and !config.config().host.mute;
     if (audio_sync) log.info("Audio sync enabled", .{});
 
@@ -63,7 +63,7 @@ pub fn run(cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: *Tracker, sync: Synch
     }
 }
 
-fn inner(comptime kind: RunKind, audio_sync: bool, cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: ?*Tracker, sync: Synchro) void {
+fn inner(comptime kind: RunKind, audio_sync: bool, cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: ?*Tracker, sync: *Synchro) void {
     if (kind == .UnlimitedFPS or kind == .LimitedFPS) {
         std.debug.assert(tracker != null);
         log.info("FPS tracking enabled", .{});

src/main.zig

@@ -119,16 +119,7 @@ pub fn main() void {
     var gui = Gui.init(allocator, &bus.apu, title_ptr) catch |e| exitln("failed to init gui: {}", .{e});
     defer gui.deinit();
 
-    var sync: Synchro = blk: {
-        const AtomicBool = std.atomic.Atomic(bool);
-
-        var ui_busy = AtomicBool.init(false);
-        var paused = AtomicBool.init(true);
-        var should_quit = AtomicBool.init(false);
-        var did_pause = AtomicBool.init(false);
-
-        break :blk .{ .ui_busy = &ui_busy, .paused = &paused, .should_quit = &should_quit, .did_pause = &did_pause };
-    };
+    var sync: Synchro = .{};
 
     if (result.args.gdb != 0) {
         const Server = @import("gdbstub").Server;
@@ -145,25 +136,25 @@ pub fn main() void {
 
         log.info("Starting GDB Server Thread", .{});
 
-        const thread = std.Thread.spawn(.{}, Server.run, .{ &server, allocator, sync.should_quit }) catch |e| exitln("gdb server thread crashed: {}", .{e});
+        const thread = std.Thread.spawn(.{}, Server.run, .{ &server, allocator, &sync.should_quit }) catch |e| exitln("gdb server thread crashed: {}", .{e});
         defer thread.join();
 
         gui.run(.{
             .cpu = &cpu,
             .scheduler = &scheduler,
-            .sync = sync,
+            .sync = &sync,
         }) catch |e| exitln("main thread panicked: {}", .{e});
     } else {
         var tracker = FpsTracker.init();
 
-        const thread = std.Thread.spawn(.{}, emu.run, .{ &cpu, &scheduler, &tracker, sync }) catch |e| exitln("emu thread panicked: {}", .{e});
+        const thread = std.Thread.spawn(.{}, emu.run, .{ &cpu, &scheduler, &tracker, &sync }) catch |e| exitln("emu thread panicked: {}", .{e});
         defer thread.join();
 
         gui.run(.{
             .cpu = &cpu,
             .scheduler = &scheduler,
             .tracker = &tracker,
-            .sync = sync,
+            .sync = &sync,
         }) catch |e| exitln("main thread panicked: {}", .{e});
     }
 }

src/platform.zig

@@ -95,7 +95,7 @@ pub const Gui = struct {
     }
 
     const RunOptions = struct {
-        sync: Synchro,
+        sync: *Synchro,
         tracker: ?*FpsTracker = null,
         cpu: *Arm7tdmi,
         scheduler: *Scheduler,
@@ -127,7 +127,7 @@ pub const Gui = struct {
         emu_loop: while (true) {
             // Outside of `SDL.SDL_QUIT` below, the DearImgui UI might signal that the program
             // should exit, in which case we should also handle this
-            if (self.state.should_quit) break :emu_loop;
+            if (self.state.should_quit or sync.should_quit.load(.Monotonic)) break :emu_loop;
 
             var event: SDL.SDL_Event = undefined;
             while (SDL.SDL_PollEvent(&event) != 0) {