From f7e3f85e5085e39eb59e5a1edd75c4a9d0100aa0 Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles@transmissionbt.com>
Date: Mon, 1 Oct 2007 14:24:22 +0000
Subject: [PATCH] follow BT `best practices' more closely w.r.t. choosing which
 pieces to download

---
 libtransmission/peer-mgr.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libtransmission/peer-mgr.c b/libtransmission/peer-mgr.c
index ffdb6f783..a129dc66a 100644
--- a/libtransmission/peer-mgr.c
+++ b/libtransmission/peer-mgr.c
@@ -482,6 +482,7 @@ struct tr_refill_piece
     uint32_t piece;
     uint32_t peerCount;
     uint32_t fastAllowed;
+    uint32_t random;
 };
 
 static int
@@ -502,8 +503,8 @@ compareRefillPiece (const void * aIn, const void * bIn)
     if (a->fastAllowed != b->fastAllowed)
         return a->fastAllowed < b->fastAllowed ? -1 : 1;
 
-    /* otherwise go with the earlier piece */
-    return a->piece - b->piece;
+    /* otherwise go with our random seed */
+    return tr_compareUint32( a->random, b->random );
 }
 
 static int
@@ -555,6 +556,7 @@ getPreferredPieces( Torrent     * t,
             setme->priority = inf->pieces[piece].priority;
             setme->peerCount = 0;
             setme->fastAllowed = 0;
+            setme->random = tr_rand( UINT32_MAX );
             /* FIXME */
 //            setme->fastAllowed = tr_bitfieldHas( t->tor->allowedList, i);