1 files changed, 42 insertions, 0 deletions
diff --git a/library/std/src/os/xous/services/ticktimer.rs b/library/std/src/os/xous/services/ticktimer.rs
new file mode 100644
index 000000000..7759303fd
--- /dev/null
+++ b/library/std/src/os/xous/services/ticktimer.rs
@@ -0,0 +1,42 @@
+use crate::os::xous::ffi::Connection;
+use core::sync::atomic::{AtomicU32, Ordering};
+
+pub(crate) enum TicktimerScalar {
+    ElapsedMs,
+    SleepMs(usize),
+    LockMutex(usize /* cookie */),
+    UnlockMutex(usize /* cookie */),
+    WaitForCondition(usize /* cookie */, usize /* timeout (ms) */),
+    NotifyCondition(usize /* cookie */, usize /* count */),
+    FreeMutex(usize /* cookie */),
+    FreeCondition(usize /* cookie */),
+}
+
+impl Into<[usize; 5]> for TicktimerScalar {
+    fn into(self) -> [usize; 5] {
+        match self {
+            TicktimerScalar::ElapsedMs => [0, 0, 0, 0, 0],
+            TicktimerScalar::SleepMs(msecs) => [1, msecs, 0, 0, 0],
+            TicktimerScalar::LockMutex(cookie) => [6, cookie, 0, 0, 0],
+            TicktimerScalar::UnlockMutex(cookie) => [7, cookie, 0, 0, 0],
+            TicktimerScalar::WaitForCondition(cookie, timeout_ms) => [8, cookie, timeout_ms, 0, 0],
+            TicktimerScalar::NotifyCondition(cookie, count) => [9, cookie, count, 0, 0],
+            TicktimerScalar::FreeMutex(cookie) => [10, cookie, 0, 0, 0],
+            TicktimerScalar::FreeCondition(cookie) => [11, cookie, 0, 0, 0],
+        }
+    }
+}
+
+/// 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
+}