* Lock for write access, wait until locked (or error).
  *   Multiple nested write locking is permitted.
  */
-int rwl_writelock(brwlock_t *rwl)
+int rwl_writelock_p(brwlock_t *rwl, const char *file, int line)
 {
    int stat;
 
       pthread_mutex_unlock(&rwl->mutex);
       return 0;
    }
-   lmgr_pre_lock(rwl, rwl->priority, __FILE__, __LINE__);
+   lmgr_pre_lock(rwl, rwl->priority, file, line);
    if (rwl->w_active || rwl->r_active > 0) {
       rwl->w_wait++;                  /* indicate that we are waiting */
       pthread_cleanup_push(rwl_write_release, (void *)rwl);
 
    {PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, \
     PTHREAD_COND_INITIALIZER, RWLOCK_VALID, 0, 0, 0, 0}
 
+#define rwl_writelock(x)     rwl_writelock_p((x), __FILE__, __LINE__)
+
 /*
  * read/write lock prototypes
  */
 extern int rwl_readlock(brwlock_t *rwlock);
 extern int rwl_readtrylock(brwlock_t *rwlock);
 extern int rwl_readunlock(brwlock_t *rwlock);
-extern int rwl_writelock(brwlock_t *rwlock);
+extern int rwl_writelock_p(brwlock_t *rwlock,
+                           const char *file="*unknown*", int line=0);
 extern int rwl_writetrylock(brwlock_t *rwlock);
 extern int rwl_writeunlock(brwlock_t *rwlock);