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_chan.cpp | 54 +++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 41 insertions(+), 13 deletions(-)

(limited to 'src/rt/rust_chan.cpp')

diff --git a/src/rt/rust_chan.cpp b/src/rt/rust_chan.cpp
index 38f93a7d..6aa9121a 100644
--- a/src/rt/rust_chan.cpp
+++ b/src/rt/rust_chan.cpp
@@ -1,29 +1,29 @@
-
 #include "rust_internal.h"
 #include "rust_chan.h"
 
 rust_chan::rust_chan(rust_task *task, rust_port *port) :
-    task(task),
-    port(port),
-    buffer(task->dom, port->unit_sz),
-    token(this)
-{
-    if (port)
+    task(task), port(port), buffer(task->dom, port->unit_sz), token(this) {
+
+    if (port) {
         port->chans.push(this);
+        ref();
+    }
+
+    task->log(rust_log::MEM | rust_log::COMM,
+              "new rust_chan(task=0x%" PRIxPTR
+              ", port=0x%" PRIxPTR ") -> chan=0x%"
+              PRIxPTR, (uintptr_t) task, (uintptr_t) port, (uintptr_t) this);
 }
 
-rust_chan::~rust_chan()
-{
+rust_chan::~rust_chan() {
     if (port) {
         if (token.pending())
             token.withdraw();
-        port->chans.swapdel(this);
+        port->chans.swap_delete(this);
     }
 }
 
-void
-rust_chan::disassociate()
-{
+void rust_chan::disassociate() {
     I(task->dom, port);
 
     if (token.pending())
@@ -31,4 +31,32 @@ rust_chan::disassociate()
 
     // Delete reference to the port/
     port = NULL;
+
+    deref();
+}
+
+/**
+ * Attempt to transmit channel data to the associated port.
+ */
+int rust_chan::transmit() {
+    rust_dom *dom = task->dom;
+
+    // TODO: Figure out how and why the port would become null.
+    if (port == NULL) {
+        dom->log(rust_log::COMM, "invalid port, transmission incomplete");
+        return ERROR;
+    }
+
+    if (buffer.is_empty()) {
+        dom->log(rust_log::COMM, "buffer is empty, transmission incomplete");
+        return ERROR;
+    }
+
+    if(port->task->blocked_on(port)) {
+        buffer.dequeue(port->task->rendezvous_ptr);
+        port->task->wakeup(port);
+    }
+
+    return 0;
+
 }
-- 
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