examples: Add program that uses Io.sleep

examples/sleep.zig

@@ -0,0 +1,34 @@
+const std = @import("std");
+const Io = std.Io;
+
+const Simulator = @import("zigmulator");
+
+fn slowProgram(init: std.process.Init) anyerror!void {
+    try Io.sleep(init.io, .fromMilliseconds(20), .awake);
+
+    var stdout = Io.File.stdout().writerStreaming(init.io, &.{});
+    try stdout.interface.writeAll("slow woke after 20ms\n");
+    try stdout.interface.flush();
+}
+
+fn fastProgram(init: std.process.Init) anyerror!void {
+    try Io.sleep(init.io, .fromMilliseconds(5), .awake);
+
+    var stdout = Io.File.stdout().writerStreaming(init.io, &.{});
+    try stdout.interface.writeAll("fast woke after 5ms\n");
+    try stdout.interface.flush();
+}
+
+pub fn main(init: std.process.Init) !void {
+    var sim: Simulator = undefined;
+    sim.init(std.heap.page_allocator, init.io);
+    defer sim.deinit();
+
+    try sim.addExecutable("slow", slowProgram);
+    try sim.addExecutable("fast", fastProgram);
+
+    try sim.spawn("slow", .{});
+    try sim.spawn("fast", .{});
+
+    while (sim.scheduleOne()) {}
+}