feat(driver,iocp): deregister from global port on drop

Author: Berrysoft

compio-driver/src/iocp/cp/global.rs

@@ -38,6 +38,10 @@ impl GlobalPort {
         receiver
     }
 
+    pub fn deregister(&self, driver: usize) {
+        self.drivers.remove(&driver);
+    }
+
     pub fn attach(&self, fd: RawFd) -> io::Result<()> {
         self.port.attach(fd)
     }
@@ -51,12 +55,9 @@ impl GlobalPort {
     }
 
     pub fn push(&self, driver: usize, entry: Entry) {
-        self.drivers
-            .get(&driver)
-            .expect("driver should register first")
-            .value()
-            .send(entry)
-            .ok(); // It's OK if the driver has been dropped.
+        if let Some(e) = self.drivers.get(&driver) {
+            e.value().send(entry).ok(); // It's OK if the driver has been dropped.
+        }
     }
 }
 
@@ -146,6 +147,12 @@ impl Port {
     }
 }
 
+impl Drop for Port {
+    fn drop(&mut self) {
+        self.port.deregister(self.id);
+    }
+}
+
 pub struct PortHandle {
     port: &'static GlobalPort,
 }