Move the inline code for waking up writers to a new function

ttwwakeup().  The conditions for doing the wakeup will soon become
more complicated and I don't want them duplicated in all drivers.

It's probably not worth making ttwwakeup() a macro or an inline
function.  The cost of the function call is relatively small when
there is a process to wake up.  There is usually a process to wake
up for large writes and the system call overhead dwarfs the function
call overhead for small writes.

17 files changed, 59 insertions, 155 deletions

diff --git a/sys/dev/cy/cy.c b/sys/dev/cy/cy.c
index 090901f..338abb1 100644
--- a/sys/dev/cy/cy.c
+++ b/sys/dev/cy/cy.c
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: cy.c,v 1.8 1995/07/05 12:15:52 bde Exp $
+ *	$Id: cy.c,v 1.9 1995/07/21 22:51:31 bde Exp $
  */
 
 #include "cy.h"
@@ -155,8 +155,6 @@
  * XXX temporary kludges for 2.0 (XXX TK2.0).
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
-#define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -2137,20 +2135,7 @@ comstart(tp)
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
 #endif
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
-
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/dev/cy/cy_isa.c b/sys/dev/cy/cy_isa.c
index 090901f..338abb1 100644
--- a/sys/dev/cy/cy_isa.c
+++ b/sys/dev/cy/cy_isa.c
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: cy.c,v 1.8 1995/07/05 12:15:52 bde Exp $
+ *	$Id: cy.c,v 1.9 1995/07/21 22:51:31 bde Exp $
  */
 
 #include "cy.h"
@@ -155,8 +155,6 @@
  * XXX temporary kludges for 2.0 (XXX TK2.0).
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
-#define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -2137,20 +2135,7 @@ comstart(tp)
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
 #endif
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
-
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/dev/rc/rc.c b/sys/dev/rc/rc.c
index 8eb0f93..1db4a3d 100644
--- a/sys/dev/rc/rc.c
+++ b/sys/dev/rc/rc.c
@@ -551,13 +551,7 @@ register struct tty *tp;
 #ifdef RCDEBUG
 	printrcflags(rc, "rcstart");
 #endif
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup((caddr_t)&tp->t_outq);
-		}
-		selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
 #ifdef RCDEBUG
 	printf("rcstart: outq = %d obuf = %d\n",
 		tp->t_outq.c_cc, rc->rc_obufend - rc->rc_optr);
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index d880196..39683e9 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.102 1995/07/05 14:30:07 bde Exp $
+ *	$Id: sio.c,v 1.103 1995/07/21 22:51:34 bde Exp $
  */
 
 #include "sio.h"
@@ -71,7 +71,6 @@
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
 #define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -1868,19 +1867,7 @@ comstart(tp)
 	if (com->state >= (CS_BUSY | CS_TTGO))
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index c48d470..e00049b 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.119 1995/07/11 17:59:22 bde Exp $
+ *  $Id: syscons.c,v 1.120 1995/07/11 18:34:29 bde Exp $
  */
 
 #include "sc.h"
@@ -1102,13 +1102,7 @@ scstart(struct tty *tp)
 	    s = spltty();
 	}
 	tp->t_state &= ~TS_BUSY;
-	if (rbp->c_cc <= tp->t_lowat) {
-	    if (tp->t_state & TS_ASLEEP) {
-		tp->t_state &= ~TS_ASLEEP;
-		wakeup((caddr_t)rbp);
-	    }
-	    selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
     }
     splx(s);
 }
diff --git a/sys/gnu/isdn/iitty.c b/sys/gnu/isdn/iitty.c
index 63f19ad..f5fc948 100644
--- a/sys/gnu/isdn/iitty.c
+++ b/sys/gnu/isdn/iitty.c
@@ -1,6 +1,6 @@
-static char     _ittyid[] = "@(#)$Id: iitty.c,v 1.6 1995/07/21 16:30:37 bde Exp $";
+static char     _ittyid[] = "@(#)$Id: iitty.c,v 1.7 1995/07/21 20:52:21 bde Exp $";
 /*******************************************************************************
- *  II - Version 0.1 $Revision: 1.6 $   $State: Exp $
+ *  II - Version 0.1 $Revision: 1.7 $   $State: Exp $
  *
  * Copyright 1994 Dietmar Friede
  *******************************************************************************
@@ -10,6 +10,12 @@ static char     _ittyid[] = "@(#)$Id: iitty.c,v 1.6 1995/07/21 16:30:37 bde Exp
  *
  *******************************************************************************
  * $Log: iitty.c,v $
+ * Revision 1.7  1995/07/21  20:52:21  bde
+ * Obtained from:	partly from ancient patches by ache and me via 1.1.5
+ *
+ * Nuke `symbolic sleep message strings'.  Use unique literal messages so that
+ * `ps l' shows unambiguously where processes are sleeping.
+ *
  * Revision 1.6  1995/07/21  16:30:37  bde
  * Obtained from:	partly from an ancient patch of mine via 1.1.5
  *
@@ -226,15 +232,7 @@ itystart(struct tty *tp)
 		splx(s);
 		return;
 	}
-	if (tp->t_outq.c_cc <= tp->t_lowat)
-	{
-		if (tp->t_state & TS_ASLEEP)
-		{
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup((caddr_t) & tp->t_outq);
-		}
-		selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
 	if (tp->t_outq.c_cc)
 	{
 		if(OUTBOUND(tp->t_dev) && (tp->t_cflag & CLOCAL) &&
diff --git a/sys/i386/isa/cx.c b/sys/i386/isa/cx.c
index c66f645..ff4b6b7 100644
--- a/sys/i386/isa/cx.c
+++ b/sys/i386/isa/cx.c
@@ -542,6 +542,9 @@ void cxoproc (struct tty *tp)
 	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
 		ttwwakeup (tp);
 #else /* FreeBSD 2.x and BSDI */
+#ifndef TS_ASLEEP /* FreeBSD some time after 2.0.5 */
+	ttwwakeup(tp);
+#else
 	if (RB_LEN (tp->t_out) <= tp->t_lowat) {
 		if (tp->t_state & TS_ASLEEP) {
 			tp->t_state &= ~TS_ASLEEP;
@@ -550,6 +553,7 @@ void cxoproc (struct tty *tp)
 		selwakeup(&tp->t_wsel);
 	}
 #endif
+#endif
 	/*
 	 * Enable TXMPTY interrupt,
 	 * to catch the case when the second buffer is empty.
diff --git a/sys/i386/isa/cy.c b/sys/i386/isa/cy.c
index 090901f..338abb1 100644
--- a/sys/i386/isa/cy.c
+++ b/sys/i386/isa/cy.c
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: cy.c,v 1.8 1995/07/05 12:15:52 bde Exp $
+ *	$Id: cy.c,v 1.9 1995/07/21 22:51:31 bde Exp $
  */
 
 #include "cy.h"
@@ -155,8 +155,6 @@
  * XXX temporary kludges for 2.0 (XXX TK2.0).
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
-#define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -2137,20 +2135,7 @@ comstart(tp)
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
 #endif
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
-
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/i386/isa/pcvt/pcvt_drv.c b/sys/i386/isa/pcvt/pcvt_drv.c
index e578d4a..a8d6c98 100644
--- a/sys/i386/isa/pcvt/pcvt_drv.c
+++ b/sys/i386/isa/pcvt/pcvt_drv.c
@@ -974,6 +974,9 @@ pcstart(register struct tty *tp)
 		timeout(ttrstrt, tp, 1);
 	}
 
+#ifndef TS_ASLEEP /* FreeBSD some time after 2.0.5 */
+	ttwwakeup(tp);
+#else
 	if (rbp->c_cc <= tp->t_lowat)
 	{
 		if (tp->t_state&TS_ASLEEP)
@@ -983,6 +986,7 @@ pcstart(register struct tty *tp)
 		}
 		selwakeup(&tp->t_wsel);
 	}
+#endif
 out:
 	splx(s);
 }
diff --git a/sys/i386/isa/rc.c b/sys/i386/isa/rc.c
index 8eb0f93..1db4a3d 100644
--- a/sys/i386/isa/rc.c
+++ b/sys/i386/isa/rc.c
@@ -551,13 +551,7 @@ register struct tty *tp;
 #ifdef RCDEBUG
 	printrcflags(rc, "rcstart");
 #endif
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup((caddr_t)&tp->t_outq);
-		}
-		selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
 #ifdef RCDEBUG
 	printf("rcstart: outq = %d obuf = %d\n",
 		tp->t_outq.c_cc, rc->rc_obufend - rc->rc_optr);
diff --git a/sys/i386/isa/sio.c b/sys/i386/isa/sio.c
index d880196..39683e9 100644
--- a/sys/i386/isa/sio.c
+++ b/sys/i386/isa/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.102 1995/07/05 14:30:07 bde Exp $
+ *	$Id: sio.c,v 1.103 1995/07/21 22:51:34 bde Exp $
  */
 
 #include "sio.h"
@@ -71,7 +71,6 @@
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
 #define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -1868,19 +1867,7 @@ comstart(tp)
 	if (com->state >= (CS_BUSY | CS_TTGO))
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/i386/isa/syscons.c b/sys/i386/isa/syscons.c
index c48d470..e00049b 100644
--- a/sys/i386/isa/syscons.c
+++ b/sys/i386/isa/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.119 1995/07/11 17:59:22 bde Exp $
+ *  $Id: syscons.c,v 1.120 1995/07/11 18:34:29 bde Exp $
  */
 
 #include "sc.h"
@@ -1102,13 +1102,7 @@ scstart(struct tty *tp)
 	    s = spltty();
 	}
 	tp->t_state &= ~TS_BUSY;
-	if (rbp->c_cc <= tp->t_lowat) {
-	    if (tp->t_state & TS_ASLEEP) {
-		tp->t_state &= ~TS_ASLEEP;
-		wakeup((caddr_t)rbp);
-	    }
-	    selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
     }
     splx(s);
 }
diff --git a/sys/isa/sio.c b/sys/isa/sio.c
index d880196..39683e9 100644
--- a/sys/isa/sio.c
+++ b/sys/isa/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.102 1995/07/05 14:30:07 bde Exp $
+ *	$Id: sio.c,v 1.103 1995/07/21 22:51:34 bde Exp $
  */
 
 #include "sio.h"
@@ -71,7 +71,6 @@
  */
 #define	TSA_CARR_ON(tp)		((void *)&(tp)->t_rawq)
 #define	TSA_OCOMPLETE(tp)	((void *)&(tp)->t_outq)
-#define	TSA_OLOWAT(tp)		((void *)&(tp)->t_outq)
 
 #define	LOTS_OF_EVENTS	64	/* helps separate urgent events from input */
 #define	RB_I_HIGH_WATER	(TTYHOG - 2 * RS_IBUFSIZE)
@@ -1868,19 +1867,7 @@ comstart(tp)
 	if (com->state >= (CS_BUSY | CS_TTGO))
 		siointr1(com);	/* fake interrupt to start output */
 	enable_intr();
-
-#if 0 /* XXX TK2.0 */
-	if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
-		ttwwakeup(tp);
-#else
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state & TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup(TSA_OLOWAT(tp));
-		}
-		selwakeup(&tp->t_wsel);
-	}
-#endif
+	ttwwakeup(tp);
 	splx(s);
 }
 
diff --git a/sys/isa/syscons.c b/sys/isa/syscons.c
index c48d470..e00049b 100644
--- a/sys/isa/syscons.c
+++ b/sys/isa/syscons.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *  $Id: syscons.c,v 1.119 1995/07/11 17:59:22 bde Exp $
+ *  $Id: syscons.c,v 1.120 1995/07/11 18:34:29 bde Exp $
  */
 
 #include "sc.h"
@@ -1102,13 +1102,7 @@ scstart(struct tty *tp)
 	    s = spltty();
 	}
 	tp->t_state &= ~TS_BUSY;
-	if (rbp->c_cc <= tp->t_lowat) {
-	    if (tp->t_state & TS_ASLEEP) {
-		tp->t_state &= ~TS_ASLEEP;
-		wakeup((caddr_t)rbp);
-	    }
-	    selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
     }
     splx(s);
 }
diff --git a/sys/kern/tty.c b/sys/kern/tty.c
index 8efe14b..9802f10 100644
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)tty.c	8.8 (Berkeley) 1/21/94
- * $Id: tty.c,v 1.54 1995/07/21 20:52:38 bde Exp $
+ * $Id: tty.c,v 1.55 1995/07/21 22:51:50 bde Exp $
  */
 
 /*-
@@ -2054,6 +2054,23 @@ ttwakeup(tp)
 }
 
 /*
+ * Wake up any writers on a tty.
+ */
+void
+ttwwakeup(tp)
+	register struct tty *tp;
+{
+
+	if (tp->t_outq.c_cc <= tp->t_lowat) {
+		if (tp->t_state & TS_ASLEEP) {
+			tp->t_state &= ~TS_ASLEEP;
+			wakeup(&tp->t_outq);
+		}
+		selwakeup(&tp->t_wsel);
+	}
+}
+
+/*
  * Look up a code for a specified speed in a conversion table;
  * used by drivers to map software speed values to hardware parameters.
  */
diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c
index 0a582fe..35fe857 100644
--- a/sys/kern/tty_pty.c
+++ b/sys/kern/tty_pty.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)tty_pty.c	8.2 (Berkeley) 9/23/93
- * $Id: tty_pty.c,v 1.12 1995/07/21 16:30:52 bde Exp $
+ * $Id: tty_pty.c,v 1.13 1995/07/21 20:52:40 bde Exp $
  */
 
 /*
@@ -373,13 +373,7 @@ ptcread(dev, uio, flag)
 			break;
 		error = uiomove(buf, cc, uio);
 	}
-	if (tp->t_outq.c_cc <= tp->t_lowat) {
-		if (tp->t_state&TS_ASLEEP) {
-			tp->t_state &= ~TS_ASLEEP;
-			wakeup((caddr_t)&tp->t_outq);
-		}
-		selwakeup(&tp->t_wsel);
-	}
+	ttwwakeup(tp);
 	return (error);
 }
 
diff --git a/sys/sys/tty.h b/sys/sys/tty.h
index 84cd46b..032db54 100644
--- a/sys/sys/tty.h
+++ b/sys/sys/tty.h
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)tty.h	8.6 (Berkeley) 1/21/94
- * $Id: tty.h,v 1.21 1995/07/21 20:57:15 bde Exp $
+ * $Id: tty.h,v 1.22 1995/07/21 22:52:01 bde Exp $
  */
 
 #ifndef _SYS_TTY_H_
@@ -231,6 +231,7 @@ int	 ttspeedtab __P((int speed, struct speedtab *table));
 int	 ttstart __P((struct tty *tp));
 void	 ttwakeup __P((struct tty *tp));
 int	 ttwrite __P((struct tty *tp, struct uio *uio, int flag));
+void	 ttwwakeup __P((struct tty *tp));
 void	 ttychars __P((struct tty *tp));
 int	 ttycheckoutq __P((struct tty *tp, int wait));
 int	 ttyclose __P((struct tty *tp));