Index: src/H5private.h
===================================================================
--- src/H5private.h	(revision 30093)
+++ src/H5private.h	(working copy)
@@ -812,13 +812,12 @@
      * fcntl(2), then fall back to a function that always fails if
      * it is not present at all.
      */
-    #if defined(H5_HAVE_FLOCK)
-        #define HDflock(F,L)    flock(F,L)
-    #elif defined(H5_HAVE_FCNTL)
-        #define HDflock(F,L)    Pflock(F,L)
-    #else
-        #define HDflock(F,L)    Nflock(F,L)
-    #endif /* H5_HAVE_FLOCK */
+    /* TEMPORARY SOURCE PATCH for HDF5 1.10.0-patch1
+     *
+     * Define the no-op function as flock to disable file
+     * locking.
+     */
+    #define HDflock(F,L)    Nflock(F,L)
 #endif /* HDflock */
 #ifndef HDfloor
     #define HDfloor(X)    floor(X)
Index: src/H5system.c
===================================================================
--- src/H5system.c	(revision 30093)
+++ src/H5system.c	(working copy)
@@ -638,14 +638,14 @@
  * Purpose:     Wrapper function for systems where no file locking is
  *              available.
  *
- * Return:      Failure:    -1 (always fails)
+ * Return:      Success:    1 (always passes)
  *
  *-------------------------------------------------------------------------
  */
 int H5_ATTR_CONST
 Nflock(int H5_ATTR_UNUSED fd, int H5_ATTR_UNUSED operation) {
-    /* just fail */
-    return -1;
+    /* just pass */
+    return 1;
 } /* end Nflock() */
 
 
Index: test/swmr.c
===================================================================
--- test/swmr.c	(revision 30093)
+++ test/swmr.c	(working copy)
@@ -4507,7 +4507,6 @@
 **    This is for concurrent access.
 **
 *****************************************************************/
-#if !(defined(H5_HAVE_FORK) && defined(H5_HAVE_WAITPID) && defined(H5_HAVE_FLOCK))
 
 static int
 test_file_lock_concur(hid_t H5_ATTR_UNUSED in_fapl)
@@ -4520,7 +4519,12 @@
 
 } /* end test_file_lock_concur() */
 
-#else
+/* THIS TEST IS DISABLED IN THIS SOURCE PATCH
+ *
+ * The test will fail when file locking (disabled in this patch)
+ * is non-functional so it is simply skipped.
+ */
+#if 0
     
 static int
 test_file_lock_concur(hid_t in_fapl)
@@ -4883,7 +4887,6 @@
 **    This is for concurrent access.
 **
 *****************************************************************/
-#if !(defined(H5_HAVE_FORK) && defined(H5_HAVE_WAITPID))
 
 static int
 test_file_lock_swmr_concur(hid_t H5_ATTR_UNUSED in_fapl)
@@ -4896,7 +4899,12 @@
 
 } /* end test_file_lock_swmr_concur() */
 
-#else
+/* THIS TEST IS DISABLED IN THIS SOURCE PATCH
+ *
+ * The test will fail when file locking (disabled in this patch)
+ * is non-functional so it is simply skipped.
+ */
+#if 0
 
 static int
 test_file_lock_swmr_concur(hid_t in_fapl)