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Merge pull request 'Demonstrate the benefit of a mutex' (#408) from MatthijsBlom/ziglings:matthijsblom-patch-1 into main

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Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/408
This commit is contained in:
Chris Boesch
2026-04-19 14:21:24 +02:00
parent f35c9419d2 c4cb76ea8e
commit ca8aee84ad
2 changed files with 10 additions and 4 deletions
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6
exercises/091_async7.zig
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@@ -52,6 +52,12 @@ fn increment(io: std.Io, state: *SharedState, times: u32) void {
state.mutex.??? catch return;
defer state.mutex.unlock(); // <-- what's missing here?
// Sleep to give the other tasks a chance to run in the meantime.
// We do this here only to make nondeterminism more visible.
io.sleep(std.Io.Duration.fromMilliseconds(1), .awake) catch {};
// What happens if you neglect to lock the mutex?
state.counter += 1;
}
}

8
patches/patches/091_async7.patch
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@@ -1,5 +1,5 @@
--- exercises/091_async7.zig 2026-04-02 10:50:08.142508099 +0200
+++ answers/091_async7.zig 2026-04-02 10:49:59.629341593 +0200
--- exercises/091_async7.zig 2026-04-18 23:30:40.963951835 +0200
+++ answers/091_async7.zig 2026-04-18 23:33:47.313340585 +0200
@@ -49,8 +49,8 @@
for (0..times) |_| {
// Acquire the lock before modifying shared state.
@@ -9,5 +9,5 @@
+ state.mutex.lock(io) catch return;
+ defer state.mutex.unlock(io);
state.counter += 1;
}
// Sleep to give the other tasks a chance to run in the meantime.
// We do this here only to make nondeterminism more visible.