JavaScriptCore-525.tar.gz

[apple/javascriptcore.git] / wtf / HashTable.cpp

diff --git a/wtf/HashTable.cpp b/wtf/HashTable.cpp
index ba45aee80ecef681b55bed5c3523027d0eec4665..71d3f86ce95b289fd841f5674781ed22a91a8559 100644 (file)
--- a/wtf/HashTable.cpp
+++ b/wtf/HashTable.cpp
@@ -1,7 +1,5 @@
 /*
-    This file is part of the KDE libraries
-
-    Copyright (C) 2005 Apple Computer
+    Copyright (C) 2005 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
@@ -36,9 +34,17 @@ int HashTableStats::numReinserts;
 
 static HashTableStats logger;
 
+static Mutex& hashTableStatsMutex()
+{
+    AtomicallyInitializedStatic(Mutex&, mutex = *new Mutex);
+    return mutex;
+}
+
 HashTableStats::~HashTableStats()
 {
-    printf("\nkhtml::HashTable statistics\n\n");
+    // Don't lock hashTableStatsMutex here because it can cause deadlocks at shutdown 
+    // if any thread was killed while holding the mutex.
+    printf("\nWTF::HashTable statistics\n\n");
     printf("%d accesses\n", numAccesses);
     printf("%d total collisions, average %.2f probes per access\n", numCollisions, 1.0 * (numAccesses + numCollisions) / numAccesses);
     printf("longest collision chain: %d\n", maxCollisions);
@@ -51,6 +57,7 @@ HashTableStats::~HashTableStats()
 
 void HashTableStats::recordCollisionAtCount(int count)
 {
+    MutexLocker lock(hashTableStatsMutex());
     if (count > maxCollisions)
         maxCollisions = count;
     numCollisions++;