tiny.simd.SpinUMonitor

1pub const SpinUMonitor = struct {2    pub fn spinType(_: SpinUMonitor) SpinType {3        return .u_monitor;4    }56    pub fn untilDifferent(7        _: SpinUMonitor,8        previous: u32,9        watched: *const std.atomic.Value(u32),10    ) SpinResult {11        if (comptime !haveUMonitor()) {12            return (SpinPause{}).untilDifferent(previous, watched);13        }14        var repetitions: u32 = 0;15        while (true) : (repetitions +%= 1) {16            var current = watched.load(.acquire);17            if (current != previous) {18                return .{19                    .value = current,20                    .repetitions = repetitions,21                };22            }23            uMonitor(&watched.raw);24            current = watched.load(.acquire);25            if (current != previous) {26                return .{27                    .value = current,28                    .repetitions = repetitions,29                };30            }31            uWait();32        }33    }3435    pub fn untilEqual(36        _: SpinUMonitor,37        expected: u32,38        watched: *const std.atomic.Value(u32),39    ) usize {40        if (comptime !haveUMonitor()) {41            return (SpinPause{}).untilEqual(expected, watched);42        }43        var repetitions: usize = 0;44        while (true) : (repetitions +%= 1) {45            var current = watched.load(.acquire);46            if (current == expected) return repetitions;47            uMonitor(&watched.raw);48            current = watched.load(.acquire);49            if (current == expected) return repetitions;50            uWait();51        }52    }53};

1pub const SpinUMonitor = thread.SpinUMonitor;