From 1c6487c1e79cbe0d59a39b483af8ec44b59c586e Mon Sep 17 00:00:00 2001
From: Chris Boesch <chrboesch@noreply.codeberg.org>
Date: Fri, 3 Apr 2026 18:11:00 +0200
Subject: added async-io quiz

---
 exercises/093_async10.zig | 67 -----------------------------------------------
 1 file changed, 67 deletions(-)
 delete mode 100644 exercises/093_async10.zig

(limited to 'exercises/093_async10.zig')

diff --git a/exercises/093_async10.zig b/exercises/093_async10.zig
deleted file mode 100644
index 6ed229d..0000000
--- a/exercises/093_async10.zig
+++ /dev/null
@@ -1,67 +0,0 @@
-//
-// In exercise 088, we learned that cancellation happens at
-// "cancellation points" — any Io function that can return
-// error.Canceled.
-//
-// But sometimes a task has a critical section that MUST NOT
-// be interrupted — for example, writing a consistent state
-// to disk, or completing a transaction.
-//
-// Io provides CancelProtection for this:
-//
-//     const old = io.swapCancelProtection(.blocked);
-//     defer _ = io.swapCancelProtection(old);
-//
-//     // In this block, NO Io function will return error.Canceled.
-//     // The cancel request is held until protection is restored.
-//
-// There are two states:
-//   .unblocked — normal: cancellation points can fire (default)
-//   .blocked   — protected: error.Canceled is never returned
-//
-// There's also io.checkCancel() — a pure cancellation point
-// that does nothing except return error.Canceled if a cancel
-// request is pending. Useful in long CPU-bound loops.
-//
-// And io.recancel() — re-arms a consumed cancel request so
-// the NEXT cancellation point will fire again.
-//
-// Fix this program so the critical section completes even
-// when the task is canceled.
-//
-const std = @import("std");
-const print = std.debug.print;
-
-pub fn main(init: std.process.Init) !void {
-    const io = init.io;
-
-    var future = io.async(importantTask, .{io});
-
-    // Give the task time to start and enter its critical section.
-    io.sleep(std.Io.Duration.fromMilliseconds(300), .awake) catch {};
-
-    // Cancel while the task is in its protected section.
-    const result = future.cancel(io);
-    print("Task result: {s}\n", .{result});
-}
-
-fn importantTask(io: std.Io) []const u8 {
-    print("Starting critical section...\n", .{});
-
-    // Protect this section from cancellation.
-    // What method swaps the cancel protection state?
-    const old = io.???(. blocked);
-    defer _ = io.???(old);
-
-    // This sleep will NOT return error.Canceled even though
-    // we get canceled during it — protection is active!
-    io.sleep(std.Io.Duration.fromMilliseconds(600), .awake) catch |err| switch (err) {
-        error.Canceled => {
-            // This should never happen while protected!
-            return "ERROR: canceled during critical section!";
-        },
-    };
-
-    print("Critical section completed safely.\n", .{});
-    return "All data saved.";
-}
-- 
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