1 files changed, 0 insertions, 57 deletions
diff --git a/exercises/092_async9.zig b/exercises/092_async9.zig
deleted file mode 100644
index ad30dcf..0000000
--- a/exercises/092_async9.zig
+++ /dev/null
@@ -1,57 +0,0 @@
-//
-// We've been using io.async() to launch tasks. But there's a
-// stronger variant: io.concurrent().
-//
-// The difference:
-//
-//   io.async():
-//     * The function MAY run on another thread, or it may run
-//       immediately on the current thread (synchronously).
-//     * Never fails — if no thread is available, it just runs
-//       the function right away.
-//     * More portable, works with all Io backends.
-//
-//   io.concurrent():
-//     * GUARANTEES a separate unit of concurrency (a real thread
-//       in the Threaded backend).
-//     * Can fail with error.ConcurrencyUnavailable if resources
-//       are exhausted or the backend doesn't support it.
-//     * Use when you NEED true parallelism.
-//
-// Because concurrent() can fail, you must handle the error:
-//
-//     var future = try io.concurrent(myFn, .{args});
-//     const result = future.await(io);
-//
-// Notice the 'try' — that's the key difference in usage!
-//
-// Fix this program to launch the computation concurrently.
-//
-const std = @import("std");
-const print = std.debug.print;
-
-pub fn main(init: std.process.Init) !void {
-    const io = init.io;
-
-    // Launch with a guaranteed separate thread.
-    // Which Io method guarantees true concurrency?
-    // (Hint: unlike io.async, this one can fail!)
-    var future = try io.???(compute, .{io});
-
-    print("Main thread continues...\n", .{});
-
-    // Wait 100 millisecond so the output order is deterministic.
-    io.sleep(std.Io.Duration.fromMilliseconds(100), .awake) catch {};
-
-    print("Main thread done waiting.\n", .{});
-
-    const result = future.await(io);
-    print("Result: {}\n", .{result});
-}
-
-fn compute(io: std.Io) u32 {
-    print("Computing on a separate thread!\n", .{});
-    // Simulate some work.
-    io.sleep(std.Io.Duration.fromMilliseconds(200), .awake) catch return 0;
-    return 123;
-}