std: xous: add ticktimer_server as a service

Add a service connection for the ticktimer server. This server is used
when managing process time, such as when sleeping a thread for a given
amount of time. It is also used for locks, such as Condvar and Mutex.

Signed-off-by: Sean Cross <[email protected]>

Author: xobs

library/std/src/os/xous/services.rs

@@ -125,3 +125,17 @@ pub(crate) fn log_server() -> Connection {
     LOG_SERVER_CONNECTION.store(cid.into(), Ordering::Relaxed);
     cid
 }
+
+/// Return a `Connection` to the ticktimer server. This server is used for synchronization
+/// primitives such as sleep, Mutex, and Condvar.
+pub(crate) fn ticktimer_server() -> Connection {
+    static TICKTIMER_SERVER_CONNECTION: AtomicU32 = AtomicU32::new(0);
+    let cid = TICKTIMER_SERVER_CONNECTION.load(Ordering::Relaxed);
+    if cid != 0 {
+        return cid.into();
+    }
+
+    let cid = crate::os::xous::ffi::connect("ticktimer-server".try_into().unwrap()).unwrap();
+    TICKTIMER_SERVER_CONNECTION.store(cid.into(), Ordering::Relaxed);
+    cid
+}