minor bugfixes

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/zlib.c b/lib/zlib.c
index 9d965137..82e82c75 100644
--- a/lib/zlib.c
+++ b/lib/zlib.c
@@ -3943,7 +3943,9 @@ z_stream *z;            /* for zfree function */
 
 
 /* build fixed tables only once--keep them here */
-local int fixed_lock = 0;
+#ifdef MULTI_THREADED
+local volatile int fixed_lock = 0;
+#endif
 local int fixed_built = 0;
 #define FIXEDH 530      /* number of hufts used by fixed tables */
 local uInt fixed_left = FIXEDH;
@@ -3984,8 +3986,10 @@ inflate_huft * FAR *tl;  /* literal/length tree result */
 inflate_huft * FAR *td;  /* distance tree result */
 {
   /* build fixed tables if not built already--lock out other instances */
+#ifdef MULTI_THREADED
   while (++fixed_lock > 1)
     fixed_lock--;
+#endif
   if (!fixed_built)
   {
     int k;              /* temporary variable */
@@ -4018,7 +4022,9 @@ inflate_huft * FAR *td;  /* distance tree result */
     /* done */
     fixed_built = 1;
   }
+#ifdef MULTI_THREADED
   fixed_lock--;
+#endif
   *bl = fixed_bl;
   *bd = fixed_bd;
   *tl = fixed_tl;