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Make sure that the pager is allocated before it is needed. Hangs

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can occur if the pager is not allocated in time.
This commit is contained in:
John Dyson 1996-09-10 01:42:34 +00:00
parent 18e4c9579e
commit ae9b8c3a66
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18199
1 changed files with 8 additions and 2 deletions
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10
sys/kern/sysv_shm.c
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@ -1,4 +1,4 @@
/* $Id: sysv_shm.c,v 1.21 1996/05/05 13:53:48 joerg Exp $ */
/* $Id: sysv_shm.c,v 1.22 1996/09/07 03:24:44 dyson Exp $ */
/* $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $ */
/*
@ -53,6 +53,7 @@
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
#include <vm/vm_pager.h>
#ifndef _SYS_SYSPROTO_H_
struct shmat_args;
@ -496,8 +497,13 @@ shmget_allocate_segment(p, uap, mode, retval)
malloc(sizeof(struct shm_handle), M_SHM, M_WAITOK);
shmid = IXSEQ_TO_IPCID(segnum, shmseg->shm_perm);
/*
* We make sure that we have allocated a pager before we need
* to.
*/
shm_handle->shm_object =
vm_object_allocate(OBJT_DEFAULT, round_page(size)/PAGE_SIZE);
vm_pager_allocate(OBJT_SWAP, 0, OFF_TO_IDX(size),
VM_PROT_DEFAULT, 0);
shmseg->shm_internal = shm_handle;
shmseg->shm_perm.cuid = shmseg->shm_perm.uid = cred->cr_uid;
shmseg->shm_perm.cgid = shmseg->shm_perm.gid = cred->cr_gid;