From: Philip Homburg <philip@cs.vu.nl>
Date: Wed, 14 Jun 2006 13:17:41 +0000 (+0000)
Subject: Wake up writer when selecting for read on an empty pipe.
X-Git-Tag: v3.1.3~346
X-Git-Url: http://zhaoyanbai.com/repos/man.delv.html?a=commitdiff_plain;h=221e731e45c258ea9b2a6dd95fc22776dbfd9543;p=minix.git

Wake up writer when selecting for read on an empty pipe.
Set fp_revived to NOT_REVIVING when decrementing reviving.
---

diff --git a/servers/fs/pipe.c b/servers/fs/pipe.c
index a6b68075d..cea632666 100644
--- a/servers/fs/pipe.c
+++ b/servers/fs/pipe.c
@@ -121,7 +121,7 @@ int notouch;			/* check only */
 				r = SUSPEND;
 			}
 			/* If need be, activate sleeping writers. */
-			if (susp_count > 0 && !notouch)
+			if (susp_count > 0)
 				release(rip, WRITE, susp_count);
 		}
 		return(r);
@@ -360,7 +360,10 @@ int proc_nr_e;
   task = -rfp->fp_task;
 
   if (rfp->fp_revived == REVIVING)
+  {
+	rfp->fp_revived = NOT_REVIVING;
 	reviving--;
+  }
 
   switch (task) {
 	case XPIPE:		/* process trying to read or write a pipe */