From 772778c0eced8f8d63bfe6b1e9801ad6aada65bf Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Tue, 11 Dec 2012 11:49:42 +0100
Subject: On SQLITE_BUSY, wait a random amount of time

If all contending processes wait a fixed amount of time (100 ms),
there is a good probability that they'll just collide again.
---
 src/libstore/local-store.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/libstore')

diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc
index b4fc64d712fa..26b4cfd8c234 100644
--- a/src/libstore/local-store.cc
+++ b/src/libstore/local-store.cc
@@ -48,7 +48,7 @@ static void throwSQLiteError(sqlite3 * db, const format & f)
 #if HAVE_NANOSLEEP
         struct timespec t;
         t.tv_sec = 0;
-        t.tv_nsec = 100 * 1000 * 1000; /* 0.1s */
+        t.tv_nsec = (random() % 100) * 1000 * 1000; /* <= 0.1s */
         nanosleep(&t, 0);
 #else
         sleep(1);
-- 
cgit 1.4.1