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| author | Jay Petacat <jay@jayschwa.net> | 2022-05-04 10:43:27 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-05-04 09:43:27 -0500 |
| commit | 28ef79ea808fdb8e00b6d88d1565314a9e412768 (patch) | |
| tree | ef5a6579b9154d18234dc4736ac75468da7e0ccf | |
| parent | 3ed9ef3e6bed3fef6d6cad07920d08b28e20ec3e (diff) | |
| download | zig-28ef79ea808fdb8e00b6d88d1565314a9e412768.tar.gz zig-28ef79ea808fdb8e00b6d88d1565314a9e412768.zip | |
std: Single-threaded `panicImpl` sleep is unreachable (#11569)
Adding `unreachable` prevents the futex code from being inspected during
a single-threaded build. Without futex, first draft BYOS packages don't
need to implement `nanosleep` to get a single-threaded "hello world"
program working.
Use of `assert()` did not achieve the desired effect of avoiding futex
in a single-threaded build.
| -rw-r--r-- | lib/std/debug.zig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/std/debug.zig b/lib/std/debug.zig index 347a9c433d..1a34d67f9d 100644 --- a/lib/std/debug.zig +++ b/lib/std/debug.zig @@ -340,6 +340,7 @@ pub fn panicImpl(trace: ?*const std.builtin.StackTrace, first_trace_addr: ?usize if (panicking.fetchSub(1, .SeqCst) != 1) { // Another thread is panicking, wait for the last one to finish // and call abort() + if (builtin.single_threaded) unreachable; // Sleep forever without hammering the CPU var futex = std.atomic.Atomic(u32).init(0); |