From de611a309006f0976bc9a579eb1087e7a89f79a7 Mon Sep 17 00:00:00 2001
From: Michael Bebenita <mbebenita@mozilla.com>
Date: Tue, 7 Sep 2010 18:39:07 -0700
Subject: Lots of design changes around proxies and message passing. Made it so
 that domains can only talk to other domains via handles, and with the help of
 the rust_kernel.

---
 src/rt/rust_kernel.h | 105 ++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 99 insertions(+), 6 deletions(-)

(limited to 'src/rt/rust_kernel.h')

diff --git a/src/rt/rust_kernel.h b/src/rt/rust_kernel.h
index 478d030c..902a9a2f 100644
--- a/src/rt/rust_kernel.h
+++ b/src/rt/rust_kernel.h
@@ -2,20 +2,113 @@
 #define RUST_KERNEL_H
 
 /**
- * A global object shared by all domains.
+ * A handle object for Rust tasks. We need a reference to the message queue
+ * of the referent's domain which we can safely hang on to since it's a
+ * kernel object. We use the referent reference as a label we stash in
+ * messages sent via this proxy.
  */
-class rust_kernel {
-    memory_region &_region;
+
+class rust_kernel;
+
+template <typename T> class
+rust_handle :
+    public rust_cond,
+    public rc_base<rust_handle<T> >,
+    public kernel_owned<rust_handle<T> > {
+public:
+    rust_kernel *kernel;
+    rust_message_queue *message_queue;
+    T *_referent;
+    T * referent() {
+        return _referent;
+    }
+    rust_handle(rust_kernel *kernel,
+                rust_message_queue *message_queue,
+                T *referent) :
+                kernel(kernel),
+                message_queue(message_queue),
+                _referent(referent) {
+        // Nop.
+    }
+};
+
+/**
+ * A global object shared by all thread domains. Most of the data structures
+ * in this class are synchronized since they are accessed from multiple
+ * threads.
+ */
+class rust_kernel : public rust_thread {
+    memory_region *_region;
     rust_log _log;
+    rust_srv *_srv;
+
+    /**
+     * Task proxy objects are kernel owned handles to Rust objects.
+     */
+    hash_map<rust_task *, rust_handle<rust_task> *> _task_handles;
+    hash_map<rust_port *, rust_handle<rust_port> *> _port_handles;
+    hash_map<rust_dom *, rust_handle<rust_dom> *> _dom_handles;
+
+    template<class T> void free_handles(hash_map<T*, rust_handle<T>* > &map);
+
+    void run();
+    void start_kernel_loop();
+    bool volatile _interrupt_kernel_loop;
+
+    /**
+     * Lock for the message queue list, so we can safely
+     */
+    spin_lock _message_queues_lock;
+
 public:
+
+    /**
+     * List of domains that are currently executing.
+     */
     synchronized_indexed_list<rust_dom> domains;
-    synchronized_indexed_list<lock_free_queue<rust_message*> > message_queues;
+
+    /**
+     * Message queues are kernel objects and are associated with domains.
+     * Their lifetime is not bound to the lifetime of a domain and in fact
+     * live on after their associated domain has died. This way we can safely
+     * communicate with domains that may have died.
+     *
+     * Although the message_queues list is synchronized, each individual
+     * message queue is lock free.
+     */
+    synchronized_indexed_list<rust_message_queue> message_queues;
+
+    rust_handle<rust_dom> *get_dom_handle(rust_dom *dom);
+    rust_handle<rust_task> *get_task_handle(rust_task *task);
+    rust_handle<rust_port> *get_port_handle(rust_port *port);
+
     rust_kernel(rust_srv *srv);
-    void register_domain(rust_dom *dom);
-    void deregister_domain(rust_dom *dom);
+
+    rust_handle<rust_dom> *create_domain(rust_crate const *root_crate,
+                                         const char *name);
+    void destroy_domain(rust_dom *dom);
+
+    bool is_deadlocked();
+
+    /**
+     * Blocks until all domains have terminated.
+     */
+    void join_all_domains();
+
     void log_all_domain_state();
     void log(uint32_t type_bits, char const *fmt, ...);
     virtual ~rust_kernel();
+
+    void *malloc(size_t size);
+    void free(void *mem);
 };
 
+inline void *operator new(size_t size, rust_kernel *kernel) {
+    return kernel->malloc(size);
+}
+
+inline void *operator new(size_t size, rust_kernel &kernel) {
+    return kernel.malloc(size);
+}
+
 #endif /* RUST_KERNEL_H */
-- 
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