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improvements for async-io

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This commit is contained in:
Chris Boesch
2026-04-05 16:13:42 +02:00
parent 2acf192775
commit 5e474ea5d1
2 changed files with 17 additions and 25 deletions
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23
exercises/087_async3.zig
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@@ -5,20 +5,17 @@
// them all. The Io backend may run them concurrently:
//
// var f1 = io.async(taskA, .{});
// defer _ = f1.cancel(io);
// var f2 = io.async(taskB, .{});
//
// // Both tasks may be running now!
// defer _ = f2.cancel(io);
// const a = f1.await(io);
// const b = f2.await(io);
//
// There's also io.concurrent() which provides a STRONGER guarantee:
// it ensures the function gets its own unit of concurrency (e.g. a
// real OS thread). But it can fail with error.ConcurrencyUnavailable
// if resources are exhausted.
//
// io.async() is more portable: if no thread is available, it simply
// runs the function synchronously. This makes it the right default
// for most code.
// Notice the defer pattern: each async call is immediately
// followed by a defer cancel. This ensures cleanup even if
// we return early or hit an error before reaching await.
// Since await/cancel are idempotent, the defer is harmless
// if we've already awaited.
//
// Fix this program to launch both tasks and collect their results.
//
@@ -29,12 +26,14 @@ pub fn main(init: std.process.Init) !void {
const io = init.io;
// Launch both tasks asynchronously.
var future_a = io.async(slowAdd, .{ 10, 20 });
var future_a = io.async(slowAdd, .{ 1, 2 });
defer _ = future_a.cancel(io);
var future_b = ???(slowMul, .{ 6, 7 });
defer _ = future_b.cancel(io);
// Await both results.
const sum = future_a.await(io);
const product = future_b.???(io);
const product = future_b.await(io);
print("{} + {} = {}\n", .{ 1, 2, sum });
print("{} * {} = {}\n", .{ 6, 7, product });

19
patches/patches/087_async3.patch
View File

@@ -1,18 +1,11 @@
--- exercises/087_async3.zig 2026-04-01 22:51:05.540094851 +0200
+++ answers/087_async3.zig 2026-04-01 22:50:44.579669189 +0200
@@ -29,12 +29,12 @@
const io = init.io;
--- exercises/087_async3.zig 2026-04-05 16:12:48.317265515 +0200
+++ answers/087_async3.zig 2026-04-05 16:12:52.269343030 +0200
@@ -28,7 +28,7 @@
// Launch both tasks asynchronously.
- var future_a = io.async(slowAdd, .{ 10, 20 });
var future_a = io.async(slowAdd, .{ 1, 2 });
defer _ = future_a.cancel(io);
- var future_b = ???(slowMul, .{ 6, 7 });
+ var future_a = io.async(slowAdd, .{ 1, 2 });
+ var future_b = io.async(slowMul, .{ 6, 7 });
defer _ = future_b.cancel(io);
// Await both results.
const sum = future_a.await(io);
- const product = future_b.???(io);
+ const product = future_b.await(io);
print("{} + {} = {}\n", .{ 1, 2, sum });
print("{} * {} = {}\n", .{ 6, 7, product });