From ceec9509950a0d20470a78c98e6d8402d1963ff5 Mon Sep 17 00:00:00 2001
From: Edward George <edwardgeorge@gmail.com>
Date: Tue, 19 Mar 2013 05:58:58 +0000
Subject: [PATCH] tpool: single request queue

https://bitbucket.org/eventlet/eventlet/pull-request/32/use-single-request-queue-for-threadpool
---
 eventlet/tpool.py | 32 +++++++++++---------------------
 1 file changed, 11 insertions(+), 21 deletions(-)

diff --git a/eventlet/tpool.py b/eventlet/tpool.py
index e7d963d..ea6c3ca 100644
--- a/eventlet/tpool.py
+++ b/eventlet/tpool.py
@@ -39,6 +39,7 @@ def _signal_t2e():
     _wfile.write(_bytetosend)
     _wfile.flush()
 
+_reqq = None
 _rspq = None
 
 def tpool_trampoline():
@@ -61,11 +62,11 @@ def tpool_trampoline():
 SYS_EXCS = (KeyboardInterrupt, SystemExit)
 EXC_CLASSES = (Exception, timeout.Timeout)
 
-def tworker(reqq):
+def tworker():
     global _rspq
     while(True):
         try:
-            msg = reqq.get()
+            msg = _reqq.get()
         except AttributeError:
             return # can't get anything off of a dud queue
         if msg is None:
@@ -104,17 +105,8 @@ def execute(meth,*args, **kwargs):
     if my_thread in _threads or imp.lock_held() or _nthreads == 0:
         return meth(*args, **kwargs)
 
-    cur = greenthread.getcurrent()
-    # a mini mixing function to make up for the fact that hash(greenlet) doesn't
-    # have much variability in the lower bits
-    k = hash(cur)
-    k = k + 0x2c865fd + (k >> 5)
-    k = k ^ 0xc84d1b7 ^ (k >> 7)
-    thread_index = k % _nthreads
-    
-    reqq, _thread = _threads[thread_index]
     e = event.Event()
-    reqq.put((e,meth,args,kwargs))
+    _reqq.put((e,meth,args,kwargs))
 
     rv = e.wait()
     if isinstance(rv,tuple) \
@@ -236,7 +228,7 @@ _threads = []
 _coro = None
 _setup_already = False
 def setup():
-    global _rfile, _wfile, _threads, _coro, _setup_already, _rspq
+    global _rfile, _wfile, _threads, _coro, _setup_already, _rspq, _reqq
     if _setup_already:
         return
     else:
@@ -259,6 +251,7 @@ def setup():
         _rfile = greenio.GreenSocket(csock).makefile('rb', 0)
         _wfile = nsock.makefile('wb',0)
 
+    _reqq = Queue(maxsize=-1)
     _rspq = Queue(maxsize=-1)
     assert _nthreads >= 0, "Can't specify negative number of threads"
     if _nthreads == 0:
@@ -267,14 +260,11 @@ def setup():
             execute in main thread.  Check the value of the environment \
             variable EVENTLET_THREADPOOL_SIZE.", RuntimeWarning)
     for i in xrange(_nthreads):
-        reqq = Queue(maxsize=-1)
         t = threading.Thread(target=tworker, 
-                             name="tpool_thread_%s" % i, 
-                             args=(reqq,))
+                             name="tpool_thread_%s" % i)
         t.setDaemon(True)
         t.start()
-        _threads.append((reqq, t))
-        
+        _threads.append(t)
 
     _coro = greenthread.spawn_n(tpool_trampoline)
 
@@ -283,9 +273,9 @@ def killall():
     global _setup_already, _rspq, _rfile, _wfile
     if not _setup_already:
         return
-    for reqq, _ in _threads:
-        reqq.put(None)
-    for _, thr in _threads:
+    for thr in _threads:
+        _reqq.put(None)
+    for thr in _threads:
         thr.join()
     del _threads[:]
     if _coro is not None: