diff options
Diffstat (limited to 'exercises')
| -rw-r--r-- | exercises/094_async10.zig | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/exercises/094_async10.zig b/exercises/094_async10.zig index 6ed229d..c561d37 100644 --- a/exercises/094_async10.zig +++ b/exercises/094_async10.zig @@ -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 // error.Canceled. // @@ -11,7 +11,7 @@ // // 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. // @@ -36,9 +36,10 @@ pub fn main(init: std.process.Init) !void { const io = init.io; var future = io.async(importantTask, .{io}); + defer _ = future.cancel(io); // 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. const result = future.cancel(io); @@ -50,12 +51,12 @@ fn importantTask(io: std.Io) []const u8 { // Protect this section from cancellation. // What method swaps the cancel protection state? - const old = io.???(. blocked); + 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) { + io.sleep(std.Io.Duration.fromMilliseconds(300), .awake) catch |err| switch (err) { error.Canceled => { // This should never happen while protected! return "ERROR: canceled during critical section!"; |