diff options
Diffstat (limited to 'sys/sys/linedisc.h')
| -rw-r--r-- | sys/sys/linedisc.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/sys/linedisc.h b/sys/sys/linedisc.h index 9124880d7c5d..2df2b741c2ce 100644 --- a/sys/sys/linedisc.h +++ b/sys/sys/linedisc.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)conf.h 8.5 (Berkeley) 1/9/95 - * $Id: conf.h,v 1.71 1999/08/13 10:29:31 phk Exp $ + * $Id: conf.h,v 1.72 1999/08/13 16:29:27 phk Exp $ */ #ifndef _SYS_CONF_H_ @@ -118,6 +118,15 @@ typedef int l_start_t __P((struct tty *tp)); typedef int l_modem_t __P((struct tty *tp, int flag)); /* + * XXX: The dummy argument can be used to do what strategy1() never + * did anywhere: Create a per device flag to lock the device during + * label/slice surgery, all calls with a dummy == 0 gets stalled on + * a queue somewhere, whereas dummy == 1 are let through. Once out + * of surgery, reset the flag and restart all the stuff on the stall + * queue. + */ +#define BUF_STRATEGY(bp, dummy) (*devsw((bp)->b_dev)->d_strategy)(bp) +/* * Types for d_type. */ #define D_TAPE 1 |