Move buffer constants at the top of net.js

Remove some cruft.

lib/net.js

@@ -2,6 +2,9 @@ var sys = require("sys");
 var fs = require("fs");
 var events = require("events");
 
+var kMinPoolSpace = 128;
+var kPoolSize = 40*1024;
+
 var debugLevel = process.env['NODE_DEBUG'] ? 1 : 0;
 function debug () {
   if (debugLevel > 0) sys.error.apply(this, arguments);
@@ -236,16 +239,10 @@ var ioWatchers = new FreeList("iowatcher", 100, function () {
 });
 
 
-var nb = 0;
-var buffers = new FreeList("buffer", 100, function (l) {
-  return new Buffer(l);
-});
-
-
 // Allocated on demand.
 var pool = null;
 function allocNewPool () {
-  pool = new Buffer(40*1024);
+  pool = new Buffer(kPoolSize);
   pool.used = 0;
 }
 
@@ -265,14 +262,10 @@ function initStream (self) {
   self._readWatcher.callback = function () {
     // If this is the first recv (pool doesn't exist) or we've used up
     // most of the pool, allocate a new one.
-    if (pool) {
-      if (pool.length - pool.used < 128) {
-        // discard the old pool. Can't add to the free list because
-        // users might have refernces to slices on it.
-        pool = null;
-        allocNewPool();
-      }
-    } else {
+    if (!pool || pool.length - pool.used < kMinPoolSpace) {
+      // discard the old pool. Can't add to the free list because
+      // users might have refernces to slices on it.
+      pool = null;
       allocNewPool();
     }
 
@@ -338,8 +331,7 @@ function initStream (self) {
   };
   self.readable = false;
 
-  // queue of buffers that need to be written to socket
-  // XXX use link list?
+  // Queue of buffers and string that need to be written to socket.
   self._writeQueue = []; 
   self._writeQueueEncoding = [];
 
@@ -445,7 +437,7 @@ Stream.prototype._writeOut = function (data, encoding) {
   } else {
     assert(typeof data == 'string')
 
-    if (!pool || pool.length - pool.used < 128) {
+    if (!pool || pool.length - pool.used < kMinPoolSpace) {
       pool = null;
       allocNewPool();
     }
@@ -665,11 +657,9 @@ Stream.prototype.forceClose = function (exception) {
   // pool is shared between sockets, so don't need to free it here.
   var self = this;
 
-  var b;
-  while (this._writeQueue.length) {
-    b = this._writeQueue.shift();
-    if (b instanceof Buffer) buffers.free(b);
-  }
+  // TODO would like to set _writeQueue to null to avoid extra object alloc,
+  // but lots of code assumes this._writeQueue is always an array.
+  this._writeQueue = [];
 
   if (this._writeWatcher) {
     this._writeWatcher.stop();