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ke/mutex: do TTAS spin

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This is better to do than `pause`-ing in a CAS loop.
This commit is contained in:
Loïc Grégoire
2026-07-18 16:08:34 -04:00
parent 89259141bb
commit fddd9865f7
1 changed files with 5 additions and 1 deletions
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src/kern/mutex.zig
+5 -1
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@@ -31,11 +31,15 @@ pub const Mutex = struct {
// Fast path: Try to acquire without a turnstile by spinning a bit. // Fast path: Try to acquire without a turnstile by spinning a bit.
for (0..optimistic_spins) |_| { for (0..optimistic_spins) |_| {
if (m.owner.cmpxchgWeak(null, curtd, .acquire, .monotonic) != null) { if (m.owner.load(.monotonic) != null) {
std.atomic.spinLoopHint(); std.atomic.spinLoopHint();
continue; continue;
} }
if (m.owner.cmpxchgWeak(null, curtd, .acquire, .monotonic) != null) {
continue;
}
ke.ipl.lower(ipl); ke.ipl.lower(ipl);
return; return;
} }