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fix: don't insta-crash due to an awful channel impl

This commit is contained in:
Rekai Nyangadzayi Musuka 2023-11-23 00:49:40 -06:00
parent dd3158bcfc
commit 557b90a39f
3 changed files with 60 additions and 69 deletions
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45
src/core/emu.zig
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@ -6,7 +6,6 @@ const Scheduler = @import("scheduler.zig").Scheduler;
const Arm7tdmi = @import("arm32").Arm7tdmi;
const Bus = @import("Bus.zig");
const Tracker = @import("../util.zig").FpsTracker;
const Channel = @import("zba-util").Channel(Message, 0x100);
pub const Message = enum { Pause, Resume, Quit };
@ -15,6 +14,18 @@ const isHalted = @import("cpu_util.zig").isHalted;
const Timer = std.time.Timer;
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,
// Emulator -> UI
did_pause: *AtomicBool,
};
/// 4 Cycles in 1 dot
const cycles_per_dot = 4;
@ -41,18 +52,18 @@ const RunKind = enum {
LimitedFPS,
};
pub fn run(cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: *Tracker, rx: Channel.Receiver) 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", .{});
if (config.config().guest.video_sync) {
inner(.LimitedFPS, audio_sync, cpu, scheduler, tracker, rx);
inner(.LimitedFPS, audio_sync, cpu, scheduler, tracker, sync);
} else {
inner(.UnlimitedFPS, audio_sync, cpu, scheduler, tracker, rx);
inner(.UnlimitedFPS, audio_sync, cpu, scheduler, tracker, sync);
}
}
fn inner(comptime kind: RunKind, audio_sync: bool, cpu: *Arm7tdmi, scheduler: *Scheduler, tracker: ?*Tracker, rx: Channel.Receiver) 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", .{});
@ -60,19 +71,16 @@ fn inner(comptime kind: RunKind, audio_sync: bool, cpu: *Arm7tdmi, scheduler: *S
const bus_ptr: *Bus = @ptrCast(@alignCast(cpu.bus.ptr));
var paused: bool = false;
switch (kind) {
.Unlimited, .UnlimitedFPS => {
log.info("Emulation w/out video sync", .{});
while (true) {
if (rx.recv()) |m| switch (m) {
.Quit => break,
.Resume, .Pause => paused = m == .Pause,
};
while (!sync.should_quit.load(.Monotonic)) {
if (sync.ui_busy.load(.Monotonic) or sync.paused.load(.Monotonic)) {
sync.did_pause.store(true, .Monotonic);
if (paused) continue;
continue;
}
runFrame(scheduler, cpu);
audioSync(audio_sync, bus_ptr.apu.stream, &bus_ptr.apu.is_buffer_full);
@ -85,13 +93,12 @@ fn inner(comptime kind: RunKind, audio_sync: bool, cpu: *Arm7tdmi, scheduler: *S
var timer = Timer.start() catch @panic("failed to initalize std.timer.Timer");
var wake_time: u64 = frame_period;
while (true) {
if (rx.recv()) |m| switch (m) {
.Quit => break,
.Resume, .Pause => paused = m == .Pause,
};
while (!sync.should_quit.load(.Monotonic)) {
if (sync.ui_busy.load(.Monotonic) or sync.paused.load(.Monotonic)) {
sync.did_pause.store(true, .Release);
if (paused) continue;
continue;
}
runFrame(scheduler, cpu);
const new_wake_time = videoSync(&timer, wake_time);

30
src/main.zig
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@ -6,7 +6,7 @@ const clap = @import("clap");
const config = @import("config.zig");
const emu = @import("core/emu.zig");
const Channel = @import("zba-util").Channel(emu.Message, 0x100);
const Synchro = @import("core/emu.zig").Synchro;
const Gui = @import("platform.zig").Gui;
const Bus = @import("core/Bus.zig");
const Scheduler = @import("core/scheduler.zig").Scheduler;
@ -103,10 +103,16 @@ 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 quit = std.atomic.Atomic(bool).init(false);
var sync: Synchro = blk: {
const AtomicBool = std.atomic.Atomic(bool);
var ch = Channel.init(allocator) catch |e| exitln("failed to initialize ui -> emu thread message channel: {}", .{e});
defer ch.deinit(allocator);
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 };
};
if (result.args.gdb != 0) {
const Server = @import("gdbstub").Server;
@ -123,29 +129,25 @@ pub fn main() void {
log.info("Starting GDB Server Thread", .{});
const thread = std.Thread.spawn(.{}, Server.run, .{ &server, allocator, &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(.Debug, .{
gui.run(.{
.cpu = &cpu,
.scheduler = &scheduler,
.ch = ch.tx,
.sync = sync,
}) catch |e| exitln("main thread panicked: {}", .{e});
} else {
var tracker = FpsTracker.init();
// emu should start paused if there's no ROM to run
if (paths.rom == null)
ch.tx.send(.Pause);
const thread = std.Thread.spawn(.{}, emu.run, .{ &cpu, &scheduler, &tracker, ch.rx }) 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(.Standard, .{
gui.run(.{
.cpu = &cpu,
.scheduler = &scheduler,
.ch = ch.tx,
.tracker = &tracker,
.sync = sync,
}) catch |e| exitln("main thread panicked: {}", .{e});
}
}

54
src/platform.zig
View File

@ -12,7 +12,7 @@ const Arm7tdmi = @import("arm32").Arm7tdmi;
const Bus = @import("core/Bus.zig");
const Scheduler = @import("core/scheduler.zig").Scheduler;
const FpsTracker = @import("util.zig").FpsTracker;
const Channel = @import("zba-util").Channel(emu.Message, 0x100);
const Synchro = @import("core/emu.zig").Synchro;
const KeyInput = @import("core/bus/io.zig").KeyInput;
const gba_width = @import("core/ppu.zig").width;
@ -95,18 +95,16 @@ pub const Gui = struct {
}
const RunOptions = struct {
ch: Channel.Sender,
sync: Synchro,
tracker: ?*FpsTracker = null,
cpu: *Arm7tdmi,
scheduler: *Scheduler,
};
const RunMode = enum { Standard, Debug };
pub fn run(self: *Self, comptime mode: RunMode, opt: RunOptions) !void {
pub fn run(self: *Self, opt: RunOptions) !void {
const cpu = opt.cpu;
const tracker = opt.tracker;
const ch = opt.ch;
const sync = opt.sync;
const bus_ptr: *Bus = @ptrCast(@alignCast(cpu.bus.ptr));
@ -196,50 +194,34 @@ pub const Gui = struct {
switch (self.state.emulation) {
.Transition => |inner| switch (inner) {
.Active => {
ch.send(.Resume);
sync.paused.store(false, .Monotonic);
if (!config.config().host.mute) SDL.SDL_PauseAudioDevice(self.audio.device, 0);
self.state.emulation = .Active;
},
.Inactive => {
// Assert that double pausing is impossible
SDL.SDL_PauseAudioDevice(self.audio.device, 1);
ch.send(.Pause);
sync.paused.store(true, .Monotonic);
self.state.emulation = .Inactive;
},
},
.Active => {
const is_std = mode == .Standard;
.Active => blk: {
sync.ui_busy.store(true, .Monotonic);
defer sync.ui_busy.store(false, .Monotonic);
if (is_std) ch.send(.Pause);
defer if (is_std) ch.send(.Resume);
// spin until we know the emu is paused :)
// switch (mode) {
// .Standard => blk: {
// const limit = 15; // TODO: What should this be?
const timeout = 0x100000;
wait_loop: for (0..timeout) |i| {
const ret = sync.did_pause.compareAndSwap(true, false, .Acquire, .Monotonic);
if (ret == null) break :wait_loop;
// // TODO: learn more about std.atomic.spinLoopHint();
// for (0..limit) |_| {
// const message = channel.gui.pop() orelse continue;
if (i == timeout - 1) break :blk;
}
// switch (message) {
// .Paused => break :blk,
// .Quit => unreachable,
// }
// }
// log.info("timed out waiting for emu thread to pause (limit: {})", .{limit});
// break :skip_draw;
// },
// .Debug => blk: {
// switch (channel.gui.pop() orelse break :blk) {
// .Paused => unreachable, // only in standard mode
// .Quit => break :emu_loop, // FIXME: gdb side of emu is seriously out-of-date...
// }
// },
// }
// while (sync.did_pause.compareAndSwap(true, false, .Acquire, .Acquire) != null) std.atomic.spinLoopHint();
// Add FPS count to the histogram
if (tracker) |t| self.state.fps_hist.push(t.value()) catch {};
@ -278,7 +260,7 @@ pub const Gui = struct {
SDL.SDL_GL_SwapWindow(self.window);
}
ch.send(.Quit);
sync.should_quit.store(true, .Monotonic);
}
fn glGetProcAddress(ctx: SDL.SDL_GLContext, proc: [:0]const u8) ?*anyopaque {