Reviewed by: julian and (hsu?)

Submitted by:	 John Birrel(L?)

changes for threadsafe operations

1 files changed, 44 insertions, 1 deletions

diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2
index 24ae2b8b..e2ec257 100644
--- a/lib/libc/sys/getsockopt.2
+++ b/lib/libc/sys/getsockopt.2
@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"	@(#)getsockopt.2	8.3 (Berkeley) 4/19/94
-.\"	$Id$
+.\"	$Id: getsockopt.2,v 1.2 1995/11/03 18:34:36 wollman Exp $
 .\"
 .Dd November 3, 1995
 .Dt GETSOCKOPT 2
@@ -313,6 +313,49 @@ returns any pending error on the socket and clears
 the error status.
 It may be used to check for asynchronous errors on connected
 datagram sockets or for other asynchronous errors.
+.Sh IMPLEMENTATION NOTES
+.Pp
+In the non-threaded library
+.Fn getsockopt
+is implemented as the
+.Va getsockopt
+syscall.
+.Pp
+In the threaded library, the
+.Va getsockopt
+syscall is assembled to
+.Fn _thread_sys_getsockopt
+and
+.Fn getsockopt
+is implemented as a function which locks
+.Va s
+for read and write, then calls
+.Fn _thread_sys_getsockopt .
+Before returning,
+.Fn getsockopt
+unlocks
+.Va s .
+.Pp
+In the non-threaded library
+.Fn setsockopt
+is implemented as the
+.Va setsockopt
+syscall.
+.Pp
+In the threaded library, the
+.Va setsockopt
+syscall is assembled to
+.Fn _thread_sys_setsockopt
+and
+.Fn setsockopt
+is implemented as a function which locks
+.Va s
+for read and write, then calls
+.Fn _thread_sys_setsockopt .
+Before returning,
+.Fn setsockopt
+unlocks
+.Va s .
 .Sh RETURN VALUES
 A 0 is returned if the call succeeds, -1 if it fails.
 .Sh ERRORS