From 00d1465d13980fc3acf650f182ee0723fbda0e06 Mon Sep 17 00:00:00 2001
From: Michael Bebenita <mbebenita@mozilla.com>
Date: Mon, 19 Jul 2010 14:05:18 -0700
Subject: Added a message passing system based on lock free queues for
 inter-thread communication. Channels now buffer on the sending side, and no
 longer require blocking when sending. Lots of other refactoring and bug
 fixes.

---
 src/rt/rust_task.h | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/rt/rust_task.h

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

diff --git a/src/rt/rust_task.h b/src/rt/rust_task.h
new file mode 100644
index 00000000..879cb61a
--- /dev/null
+++ b/src/rt/rust_task.h
@@ -0,0 +1,107 @@
+/*
+ *
+ */
+
+#ifndef RUST_TASK_H
+#define RUST_TASK_H
+struct
+rust_task : public rust_proxy_delegate<rust_task>,
+            public dom_owned<rust_task>,
+            public rust_cond
+{
+    // Fields known to the compiler.
+    stk_seg *stk;
+    uintptr_t runtime_sp;      // Runtime sp while task running.
+    uintptr_t rust_sp;         // Saved sp when not running.
+    gc_alloc *gc_alloc_chain;  // Linked list of GC allocations.
+    rust_dom *dom;
+    rust_crate_cache *cache;
+
+    // Fields known only to the runtime.
+    ptr_vec<rust_task> *state;
+    rust_cond *cond;
+    rust_task *supervisor;     // Parent-link for failure propagation.
+    size_t idx;
+    size_t gc_alloc_thresh;
+    size_t gc_alloc_accum;
+
+    // Wait queue for tasks waiting for this task.
+    rust_wait_queue waiting_tasks;
+
+    // Rendezvous pointer for receiving data when blocked on a port. If we're
+    // trying to read data and no data is available on any incoming channel,
+    // we block on the port, and yield control to the scheduler. Since, we
+    // were not able to read anJything, we remember the location where the
+    // result should go in the rendezvous_ptr, and let the sender write to
+    // that location before waking us up.
+    uintptr_t* rendezvous_ptr;
+
+    rust_alarm alarm;
+
+    rust_task(rust_dom *dom,
+              rust_task *spawner);
+    ~rust_task();
+
+    void start(uintptr_t exit_task_glue,
+               uintptr_t spawnee_fn,
+               uintptr_t args,
+               size_t callsz);
+    void grow(size_t n_frame_bytes);
+    bool running();
+    bool blocked();
+    bool blocked_on(rust_cond *cond);
+    bool dead();
+
+    void link_gc(gc_alloc *gcm);
+    void unlink_gc(gc_alloc *gcm);
+    void *malloc(size_t sz, type_desc *td=0);
+    void *realloc(void *data, size_t sz, bool gc_mem=false);
+    void free(void *p, bool gc_mem=false);
+
+    const char *state_str();
+    void transition(ptr_vec<rust_task> *svec, ptr_vec<rust_task> *dvec);
+
+    void block(rust_cond *on);
+    void wakeup(rust_cond *from);
+    void die();
+    void unblock();
+
+    void check_active() { I(dom, dom->curr_task == this); }
+    void check_suspended() { I(dom, dom->curr_task != this); }
+
+    void log(uint32_t type_bits, char const *fmt, ...);
+
+    // Swap in some glue code to run when we have returned to the
+    // task's context (assuming we're the active task).
+    void run_after_return(size_t nargs, uintptr_t glue);
+
+    // Swap in some glue code to run when we're next activated
+    // (assuming we're the suspended task).
+    void run_on_resume(uintptr_t glue);
+
+    // Save callee-saved registers and return to the main loop.
+    void yield(size_t nargs);
+
+    // Fail this task (assuming caller-on-stack is different task).
+    void kill();
+
+    // Fail self, assuming caller-on-stack is this task.
+    void fail(size_t nargs);
+
+    // Run the gc glue on the task stack.
+    void gc(size_t nargs);
+
+    // Disconnect from our supervisor.
+    void unsupervise();
+
+    // Notify tasks waiting for us that we are about to die.
+    void notify_waiting_tasks();
+
+    uintptr_t get_fp();
+    uintptr_t get_previous_fp(uintptr_t fp);
+    frame_glue_fns *get_frame_glue_fns(uintptr_t fp);
+    rust_crate_cache * get_crate_cache(rust_crate const *curr_crate);
+};
+
+
+#endif /* RUST_TASK_H */
-- 
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