windows-sleep-when-out-of-buffers-20061212

When there are no free buffers, don't loop continuously.
Sleep so that the other threads that are holding the buffers
can grab the global buffer lock and release them.

src/WINNT/afsd/cm_buf.c

@@ -862,6 +862,7 @@ long buf_GetNewLocked(struct cm_scache *scp, osi_hyper_t *offsetp, cm_buf_t **bu
             return 0;
         } /* for all buffers in lru queue */
         lock_ReleaseWrite(&buf_globalLock);
+		Sleep(100);		/* give some time for a buffer to be freed */
     }	/* while loop over everything */
     /* not reached */
 } /* the proc */