Module Name: src
Committed By: ad
Date: Thu Oct 5 19:44:26 UTC 2023
Modified Files:
src/sys/kern: sys_pipe.c
Log Message:
Update comments to match reality
To generate a diff of this commit:
cvs rdiff -u -r1.163 -r1.164 src/sys/kern/sys_pipe.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/sys_pipe.c
diff -u src/sys/kern/sys_pipe.c:1.163 src/sys/kern/sys_pipe.c:1.164
--- src/sys/kern/sys_pipe.c:1.163 Wed Oct 4 22:41:56 2023
+++ src/sys/kern/sys_pipe.c Thu Oct 5 19:44:26 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: sys_pipe.c,v 1.163 2023/10/04 22:41:56 ad Exp $ */
+/* $NetBSD: sys_pipe.c,v 1.164 2023/10/05 19:44:26 ad Exp $ */
/*-
* Copyright (c) 2003, 2007, 2008, 2009, 2023 The NetBSD Foundation, Inc.
@@ -52,23 +52,10 @@
* This file contains a high-performance replacement for the socket-based
* pipes scheme originally used. It does not support all features of
* sockets, but does do everything that pipes normally do.
- *
- * This code has two modes of operation, a small write mode and a large
- * write mode. The small write mode acts like conventional pipes with
- * a kernel buffer. If the buffer is less than PIPE_MINDIRECT, then the
- * "normal" pipe buffering is done. If the buffer is between PIPE_MINDIRECT
- * and PIPE_SIZE in size it is mapped read-only into the kernel address space
- * using the UVM page loan facility from where the receiving process can copy
- * the data directly from the pages in the sending process.
- *
- * The constant PIPE_MINDIRECT is chosen to make sure that buffering will
- * happen for small transfers so that the system will not spend all of
- * its time context switching. PIPE_SIZE is constrained by the
- * amount of kernel virtual memory.
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sys_pipe.c,v 1.163 2023/10/04 22:41:56 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sys_pipe.c,v 1.164 2023/10/05 19:44:26 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -746,8 +733,6 @@ pipe_write(file_t *fp, off_t *offset, st
/*
* We have something to offer, wake up select/poll.
- * wmap->cnt is always 0 in this point (direct write
- * is only done synchronously), so check only wpipe->pipe_buffer.cnt
*/
if (bp->cnt)
pipeselwakeup(wpipe, wpipe, POLL_IN);
