From 619b731f5bb5e09dcf1eaf1fbd96383ca64398fd Mon Sep 17 00:00:00 2001
From: julian <julian@FreeBSD.org>
Date: Mon, 22 Jan 1996 00:02:33 +0000
Subject: Reviewed by:	julian and (hsu?) Submitted by:	 John Birrel(L?)

changes for threadsafe operations
---
 lib/libc/sys/open.2 | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'lib/libc/sys/open.2')

diff --git a/lib/libc/sys/open.2 b/lib/libc/sys/open.2
index dea59fc..479a209 100644
--- a/lib/libc/sys/open.2
+++ b/lib/libc/sys/open.2
@@ -146,6 +146,26 @@ The system imposes a limit on the number of file descriptors
 open simultaneously by one process.
 .Xr Getdtablesize 2
 returns the current system limit.
+.Pp
+.Sh IMPLEMENTATION NOTES
+In the non-threaded library
+.Fn open
+is implemented as the
+.Va open
+syscall.
+.Pp
+In the threaded library, the
+.Va open
+syscall is assembled to
+.Fn _thread_sys_open
+and
+.Fn open
+is implemented as a function which disables thread rescheduling
+and calls
+.Fn _thread_sys_open .
+Before returning,
+.Fn open
+enables thread rescheduling.
 .Sh ERRORS
 The named file is opened unless:
 .Bl -tag -width Er
-- 
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