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openbsd: Io.Threaded: use futex

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Michael Dusan 2025-12-29 21:02:11 -05:00
parent f862762f09
commit ceb59b48b4
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1 changed files with 37 additions and 0 deletions
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37
lib/std/Io/Threaded.zig
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@ -390,6 +390,33 @@ const Thread = struct {
else => unreachable,
};
},
.openbsd => {
var tm: std.c.timespec = undefined;
var tm_ptr: ?*const std.c.timespec = null;
if (timeout_ns) |ns| {
tm_ptr = &tm;
tm = timestampToPosix(ns);
}
if (thread) |t| try t.beginSyscall();
const rc = std.c.futex(
ptr,
std.c.FUTEX.WAIT | std.c.FUTEX.PRIVATE_FLAG,
@as(c_int, @bitCast(expect)),
tm_ptr,
null, // uaddr2 is ignored
);
if (thread) |t| t.endSyscall();
if (is_debug) switch (posix.errno(rc)) {
.SUCCESS => {},
.NOSYS => unreachable, // constant op known good value
.AGAIN => {}, // contents of uaddr != val
.INVAL => unreachable, // invalid timeout
.TIMEDOUT => {}, // timeout
.INTR => {}, // a signal arrived
.CANCELED => {}, // a signal arrived and SA_RESTART was set
else => unreachable,
};
},
else => if (std.Thread.use_pthreads) {
// TODO integrate the following function being called with robust cancelation.
return pthreads_futex.wait(ptr, expect, timeout_ns) catch |err| switch (err) {
@ -473,6 +500,16 @@ const Thread = struct {
else => unreachable, // deadlock due to operating system bug
}
},
.openbsd => {
const rc = std.c.futex(
ptr,
std.c.FUTEX.WAKE | std.c.FUTEX.PRIVATE_FLAG,
@min(max_waiters, std.math.maxInt(c_int)),
null, // timeout is ignored
null, // uaddr2 is ignored
);
assert(rc >= 0);
},
else => if (std.Thread.use_pthreads) {
return pthreads_futex.wake(ptr, max_waiters);
} else {