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This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig standard library. Private Function

lock

Private Function
std.Io.Dispatch.Group.lock
fn lock(group: Group, ev: *Evented) void

Params

File

Io/Dispatch.zig:1162
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    fn lock(group: Group, ev: *Evented) void {
        const mutex = group.mutexPtr();
        {
            const old_state = @atomicRmw(
                Group.Mutex,
                mutex,
                .Or,
                .{ .locked = true, .contended = false, .shared2 = 0 },
                .acquire,
            );
            if (!old_state.locked) {
                @branchHint(.likely);
                return;
            }
            if (old_state.contended) {
                futexWaitUncancelable(ev, @ptrCast(mutex), @bitCast(old_state));
            }
        }
        while (true) {
            var old_state = @atomicRmw(
                Group.Mutex,
                mutex,
                .Or,
                .{ .locked = true, .contended = true, .shared2 = 0 },
                .acquire,
            );
            if (!old_state.locked) {
                @branchHint(.likely);
                return;
            }
            old_state.contended = true;
            futexWaitUncancelable(ev, @ptrCast(mutex), @bitCast(old_state));
        }
    }