Add a Mutex implementation.

rust/lib/mammoth/src/sync.rs

@@ -1,3 +1,7 @@
+use core::cell::UnsafeCell;
+use core::ops::Deref;
+use core::ops::DerefMut;
+
 use crate::{cap::Capability, syscall, zion::ZError};
 
 pub struct Semaphore {
@@ -17,3 +21,52 @@ impl Semaphore {
         syscall::semaphone_signal(&self.cap)
     }
 }
+
+pub struct Mutex<T> {
+    cap: Capability,
+    data: UnsafeCell<T>,
+}
+
+unsafe impl<T> Sync for Mutex<T> where T: Send {}
+
+pub struct MutexGuard<'a, T> {
+    mutex: &'a Mutex<T>,
+}
+
+unsafe impl<T> Send for MutexGuard<'_, T> where T: Send {}
+unsafe impl<T> Sync for MutexGuard<'_, T> where T: Sync {}
+
+impl<T> Deref for MutexGuard<'_, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        unsafe { &*self.mutex.data.get() }
+    }
+}
+
+impl<T> DerefMut for MutexGuard<'_, T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        unsafe { &mut *self.mutex.data.get() }
+    }
+}
+
+impl<T> Mutex<T> {
+    pub fn new(data: T) -> Mutex<T> {
+        Mutex {
+            cap: syscall::mutex_create().unwrap(),
+            data: UnsafeCell::new(data),
+        }
+    }
+
+    pub fn lock(&self) -> MutexGuard<T> {
+        syscall::mutex_lock(&self.cap).unwrap();
+
+        MutexGuard { mutex: self }
+    }
+}
+
+impl<T> Drop for MutexGuard<'_, T> {
+    fn drop(&mut self) {
+        syscall::mutex_release(&self.mutex.cap).unwrap();
+    }
+}

rust/lib/mammoth/src/syscall.rs

@@ -412,6 +412,36 @@ pub fn reply_port_recv(
     Ok((num_bytes, num_caps))
 }
 
+pub fn mutex_create() -> Result<Capability, ZError> {
+    let mut mutex_cap: z_cap_t = 0;
+    syscall(
+        zion::kZionMutexCreate,
+        &zion::ZMutexCreateReq {
+            mutex_cap: &mut mutex_cap,
+        },
+    )?;
+
+    Ok(Capability::take(mutex_cap))
+}
+
+pub fn mutex_lock(mutex_cap: &Capability) -> Result<(), ZError> {
+    syscall(
+        zion::kZionMutexLock,
+        &zion::ZMutexLockReq {
+            mutex_cap: mutex_cap.raw(),
+        },
+    )
+}
+
+pub fn mutex_release(mutex_cap: &Capability) -> Result<(), ZError> {
+    syscall(
+        zion::kZionMutexRelease,
+        &zion::ZMutexReleaseReq {
+            mutex_cap: mutex_cap.raw(),
+        },
+    )
+}
+
 pub fn semaphore_create() -> Result<Capability, ZError> {
     let mut sem_cap: z_cap_t = 0;
     syscall(

rust/lib/mammoth/src/thread.rs

@@ -42,3 +42,43 @@ impl Thread {
         syscall::thread_wait(&self.cap)
     }
 }
+
+pub struct JoinHandle {
+    cap: Capability,
+}
+
+impl JoinHandle {
+    pub fn join(&self) -> Result<(), zion::ZError> {
+        syscall::thread_wait(&self.cap)
+    }
+}
+
+#[no_mangle]
+extern "C" fn entry_point(func: *mut c_void) -> ! {
+    unsafe {
+        Box::from_raw(func as *mut Box<dyn FnOnce()>)();
+    }
+
+    syscall::thread_exit()
+}
+
+pub fn spawn<F>(f: F) -> JoinHandle
+where
+    F: FnOnce() + Send + 'static,
+{
+    // This is very tricky.
+    // If we have been passed a closure that doesn't capture
+    // anything it will be 0 size and creating a Box of it
+    // will create a pointer with address 0x1.
+    // So we create this "main" closure that captures f to get around this.
+    // Also somehow having the explicit type annotation here is important.
+    let main: Box<dyn FnOnce()> = Box::new(move || {
+        f();
+    });
+    let raw_main = Box::into_raw(Box::new(main));
+    let proc_cap = Capability::take_copy(unsafe { crate::init::SELF_PROC_CAP }).unwrap();
+    let cap = syscall::thread_create(&proc_cap).unwrap();
+    syscall::thread_start(&cap, entry_point as u64, raw_main as u64, 0).unwrap();
+
+    JoinHandle { cap }
+}

rust/lib/voyageurs/src/listener.rs

@@ -1,12 +1,7 @@
-use core::cell::RefCell;
-
-use alloc::boxed::Box;
-use alloc::rc::Rc;
 use alloc::string::ToString;
 use mammoth::cap::Capability;
 use mammoth::port::PortServer;
-use mammoth::thread::Thread;
-use mammoth::zion::ZError;
+use mammoth::thread;
 
 #[repr(u8)]
 #[allow(dead_code)]
@@ -198,67 +193,34 @@ pub trait KeyboardHandler {
     fn handle_char(&mut self, c: char);
 }
 
-pub struct KeyboardListener {
-    listen_port: PortServer,
-    listen_thread: Option<Box<Thread>>,
-    handler: Rc<RefCell<dyn KeyboardHandler>>,
-}
-
-impl KeyboardListener {
-    pub fn new(handler: Rc<RefCell<dyn KeyboardHandler>>) -> Result<Box<Self>, ZError> {
-        let mut listnr = Box::new(Self {
-            listen_port: PortServer::new()?,
-            listen_thread: None,
-            handler,
-        });
-
+pub fn spawn_keyboard_listener<T>(mut handler: T) -> thread::JoinHandle
+where
+    T: KeyboardHandler + Send + 'static,
+{
+    let listen_port = PortServer::new().unwrap();
     let voyageur_endpoint = yellowstone_yunq::from_init_endpoint()
         .get_endpoint(&yellowstone_yunq::GetEndpointRequest {
             endpoint_name: "voyageurs".to_string(),
-            })?
+        })
+        .unwrap()
         .endpoint;
 
     let mut voyageur_client = crate::VoyageursClient::new(Capability::take(voyageur_endpoint));
 
-        voyageur_client.register_keyboard_listener(&crate::KeyboardListener {
-            port_capability: listnr.listen_port.create_client_cap()?,
-        })?;
+    voyageur_client
+        .register_keyboard_listener(&crate::KeyboardListener {
+            port_capability: listen_port.create_client_cap().unwrap(),
+        })
+        .unwrap();
 
-        let thread_entry = |self_raw| {
-            let listener = unsafe {
-                (self_raw as *mut KeyboardListener)
-                    .as_mut()
-                    .expect("Failed to convert to keyboard listener")
-            };
-            listener.listen_loop();
-        };
-
-        listnr.listen_thread = Some(Thread::spawn(
-            thread_entry,
-            &*listnr as *const Self as *const core::ffi::c_void,
-        )?);
-
-        Ok(listnr)
-    }
-
-    fn listen_loop(&mut self) {
-        loop {
-            let scancode = self
-                .listen_port
-                .recv_u16()
-                .expect("Failed to recieve scancode");
+    let listen_thread = move || loop {
+        let scancode = listen_port.recv_u16().expect("Failed to recieve scancode");
 
         let keycode = Keycode::from_scancode(scancode);
         let modifiers = Modifiers::from_scancode(scancode);
 
-            self.handler
-                .as_ref()
-                .borrow_mut()
-                .handle_char(into_char(keycode, modifiers))
-        }
-    }
+        handler.handle_char(into_char(keycode, modifiers))
+    };
 
-    pub fn join(&self) -> Result<(), ZError> {
-        self.listen_thread.as_ref().unwrap().join()
-    }
+    thread::spawn(listen_thread)
 }

rust/sys/teton/src/main.rs

@@ -8,11 +8,8 @@ mod framebuffer;
 mod psf;
 mod terminal;
 
-use core::cell::RefCell;
-
-use alloc::rc::Rc;
 use mammoth::{debug, define_entry, zion::z_err_t};
-use voyageurs::listener::KeyboardListener;
+use voyageurs::listener;
 
 define_entry!();
 
@@ -39,9 +36,9 @@ extern "C" fn main() -> z_err_t {
 
     let psf = psf::Psf::new("/default8x16.psfu").expect("Failed to open font file.");
     let console = console::Console::new(framebuffer, psf);
-    let terminal = Rc::new(RefCell::new(terminal::Terminal::new(console)));
+    let terminal = terminal::Terminal::new(console);
 
-    let kb_listener = KeyboardListener::new(terminal).expect("Failed to create keyboard listener");
+    let kb_listener = listener::spawn_keyboard_listener(terminal);
 
     kb_listener
         .join()

rust/usr/testbed/src/main.rs

@@ -3,6 +3,7 @@
 
 extern crate alloc;
 
+use alloc::boxed::Box;
 use alloc::string::ToString;
 use mammoth::debug;
 use mammoth::define_entry;
@@ -12,6 +13,10 @@ use yellowstone_yunq::GetEndpointRequest;
 
 define_entry!();
 
+pub fn testthread() {
+    debug!("Testing 1, 8 ,9");
+}
+
 #[no_mangle]
 pub extern "C" fn main() -> z_err_t {
     debug!("Testing!");
@@ -28,11 +33,24 @@ pub extern "C" fn main() -> z_err_t {
 
     debug!("Got endpoint w/ cap: {:#x}", endpoint.endpoint);
 
+    let a = Box::new(1);
+    let b = Box::new(1);
+    debug!("Addrs: {:p} {:p}", a, b);
+
     let e: thread::ThreadEntry = |_| {
         debug!("Testing 1 2 3");
     };
     let t = thread::Thread::spawn(e, core::ptr::null()).expect("Failed to spawn thread");
+    t.join().expect("Failed to wait.");
 
+    let x = Box::new(|| 1);
+    debug!("Addr: {:p}", x);
+    debug!("Addr: {:p}", &x);
+
+    let t = thread::spawn(testthread);
+    t.join().expect("Failed to wait.");
+
+    let t = thread::spawn(|| debug!("Testing 4, 5, 6"));
     t.join().expect("Failed to wait.");
 
     0