2 files changed, 11 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 2e27f6a..2f71846 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2001-12-21  Ross Johnson  <rpj@special.ise.canberra.edu.au>
+
+	Contributed by - Alexander Terekhov <TEREKHOV@de.ibm.com>
+	
+	* mutex.c (pthread_mutex_lock): Decrementing lock_idx was
+	not thread-safe.
+	(pthread_mutex_trylock): Likewise.
+
 2001-10-26  Ross Johnson  <rpj@special.ise.canberra.edu.au>
 
 	Reported by -  prionx@juno.com
diff --git a/mutex.c b/mutex.c
index 0009428..e62647e 100644
--- a/mutex.c
+++ b/mutex.c
@@ -650,7 +650,7 @@ pthread_mutex_lock(pthread_mutex_t *mutex)
       if( mx->kind != PTHREAD_MUTEX_FAST_NP &&
           pthread_equal( mx->ownerThread, pthread_self() ) )
 	{
-          mx->lock_idx--;
+          (void) InterlockedDecrement( &mx->lock_idx );
 
           if( mx->kind == PTHREAD_MUTEX_RECURSIVE_NP )
             {
@@ -766,7 +766,7 @@ pthread_mutex_trylock(pthread_mutex_t *mutex)
 	    }
           else
             {
-              mx->lock_idx--;
+              (void) InterlockedDecrement( &mx->lock_idx );
               result = EBUSY;
             }
 
@@ -780,3 +780,4 @@ pthread_mutex_trylock(pthread_mutex_t *mutex)
 
   return(result);
 }
+