File ImageMagick-6.4.3.6-race.patch of Package ImageMagick

--- magick/cache.c
+++ magick/cache.c
@@ -4325,44 +4325,35 @@
 
 MagickExport MagickBooleanType SyncImagePixelCache(Image *image)
 {
-  CacheInfo
-    *cache_info;
-
   MagickBooleanType
     status;
 
+  RectangleInfo
+    geometry;
+
   assert(image != (Image *) NULL);
   assert(image->signature == MagickSignature);
   if (image->debug != MagickFalse)
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
   assert(image->cache != (Cache) NULL);
   status=MagickTrue;
-  cache_info=(CacheInfo *) image->cache;
-  if ((cache_info->reference_count > 1) ||
-      (IsCacheSynchronized(image) == MagickFalse))
-    {
-      AcquireSemaphoreInfo(&cache_info->semaphore);
-      if ((cache_info->reference_count > 1) ||
-          (IsCacheSynchronized(image) == MagickFalse))
-        {
-          status=ModifyCache(image);
-          if (status != MagickFalse)
-            status=SyncCache(image);
-          if (status != MagickFalse)
-            {
-              RectangleInfo
-                region;
-
-              region.x=0;
-              region.y=0;
-              region.width=image->columns;
-              region.height=1;
-              if (SetNexus(image,&region,0) == (PixelPacket *) NULL)
-                status=MagickFalse;
-            }
-        }
-      RelinquishSemaphoreInfo(cache_info->semaphore);
-    }
+  AcquireSemaphoreInfo(&image->semaphore);
+#if !defined(MAGICKCORE_HAVE_PTHREAD)
+  #pragma omp critical (pixel_cache)
+  {
+#endif
+    if (ModifyCache(image) == MagickFalse)
+      status=MagickFalse;
+    if (SyncCache(image) == MagickFalse)
+      status=MagickFalse;
+    SetGeometry(image,&geometry);
+    geometry.height=1;
+    if (SetNexus(image,&geometry,0) == (PixelPacket *) NULL)
+      status=MagickFalse;
+#if !defined(MAGICKCORE_HAVE_PTHREAD)
+  }
+#endif
+  RelinquishSemaphoreInfo(image->semaphore);
   return(status);
 }