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improvements for async-io

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This commit is contained in:
Chris Boesch
2026-04-06 19:38:19 +02:00
parent 09bae6a70e
commit 55a4841b07
2 changed files with 10 additions and 9 deletions
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11
exercises/094_async10.zig
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@@ -1,5 +1,5 @@
// //
// In exercise 088, we learned that cancellation happens at // In exercise 089, we learned that cancellation happens at
// "cancellation points" — any Io function that can return // "cancellation points" — any Io function that can return
// error.Canceled. // error.Canceled.
// //
@@ -11,7 +11,7 @@
// //
// const old = io.swapCancelProtection(.blocked); // const old = io.swapCancelProtection(.blocked);
// defer _ = io.swapCancelProtection(old); // defer _ = io.swapCancelProtection(old);
//
// // In this block, NO Io function will return error.Canceled. // // In this block, NO Io function will return error.Canceled.
// // The cancel request is held until protection is restored. // // The cancel request is held until protection is restored.
// //
@@ -36,9 +36,10 @@ pub fn main(init: std.process.Init) !void {
const io = init.io; const io = init.io;
var future = io.async(importantTask, .{io}); var future = io.async(importantTask, .{io});
defer _ = future.cancel(io);
// Give the task time to start and enter its critical section. // Give the task time to start and enter its critical section.
io.sleep(std.Io.Duration.fromMilliseconds(300), .awake) catch {}; io.sleep(std.Io.Duration.fromMilliseconds(200), .awake) catch {};
// Cancel while the task is in its protected section. // Cancel while the task is in its protected section.
const result = future.cancel(io); const result = future.cancel(io);
@@ -50,12 +51,12 @@ fn importantTask(io: std.Io) []const u8 {
// Protect this section from cancellation. // Protect this section from cancellation.
// What method swaps the cancel protection state? // What method swaps the cancel protection state?
const old = io.???(. blocked); const old = io.???(.blocked);
defer _ = io.???(old); defer _ = io.???(old);
// This sleep will NOT return error.Canceled even though // This sleep will NOT return error.Canceled even though
// we get canceled during it — protection is active! // we get canceled during it — protection is active!
io.sleep(std.Io.Duration.fromMilliseconds(600), .awake) catch |err| switch (err) { io.sleep(std.Io.Duration.fromMilliseconds(300), .awake) catch |err| switch (err) {
error.Canceled => { error.Canceled => {
// This should never happen while protected! // This should never happen while protected!
return "ERROR: canceled during critical section!"; return "ERROR: canceled during critical section!";

8
patches/patches/094_async10.patch
View File

@@ -1,10 +1,10 @@
--- exercises/094_async10.zig 2026-04-03 14:25:16.600025924 +0200 --- exercises/094_async10.zig 2026-04-06 19:36:59.873966580 +0200
+++ answers/094_async10.zig 2026-04-03 14:24:56.192615893 +0200 +++ answers/094_async10.zig 2026-04-06 19:37:12.416216872 +0200
@@ -50,8 +50,8 @@ @@ -51,8 +51,8 @@
// Protect this section from cancellation. // Protect this section from cancellation.
// What method swaps the cancel protection state? // What method swaps the cancel protection state?
- const old = io.???(. blocked); - const old = io.???(.blocked);
- defer _ = io.???(old); - defer _ = io.???(old);
+ const old = io.swapCancelProtection(.blocked); + const old = io.swapCancelProtection(.blocked);
+ defer _ = io.swapCancelProtection(old); + defer _ = io.swapCancelProtection(old);