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Added P_SWAPPING flag to implement a lock for swap in. It was possible for

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a process to be chosen for swap-in while it was being swapped-out. This was
BAD.

Submitted by:	John Dyson
This commit is contained in:
David Greenman 1994-11-13 12:46:08 +00:00
parent 07d0d0fc9c
commit 0d15e0ac1e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=4438
1 changed files with 3 additions and 2 deletions
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5
sys/sys/proc.h
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)proc.h 8.8 (Berkeley) 1/21/94
* $Id: proc.h,v 1.11 1994/10/02 17:24:52 phk Exp $
* $Id: proc.h,v 1.12 1994/10/10 00:58:32 phk Exp $
*/
#ifndef _SYS_PROC_H_
@ -195,8 +195,9 @@ struct proc {
#define P_WAITED 0x01000 /* Debugging process has waited for child. */
#define P_WEXIT 0x02000 /* Working on exiting. */
#define P_EXEC 0x04000 /* Process called exec. */
#define P_SWAPPING 0x40000 /* Process is being swapped */
/* Should probably be changed into a hold count. */
/* Should probably be changed into a hold count (They have. -DG). */
#define P_NOSWAP 0x08000 /* Another flag to prevent swap out. */
#define P_PHYSIO 0x10000 /* Doing physical I/O. */