1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/* Implementation of memory_object_lock_completed for pager library
Copyright (C) 1994 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "memory_object_S.h"
#include <stdio.h>
/* The kernel calls this (as described in <mach/memory_object.defs>)
when a memory_object_lock_request call has completed. Read this
in combination with lock-object.c. */
kern_return_t
_pager_seqnos_memory_object_lock_completed (mach_port_t object,
mach_port_seqno_t seqno,
mach_port_t control,
vm_offset_t offset,
vm_size_t length)
{
struct pager *p;
struct lock_request *lr;
if (!(p = ports_check_port_type (object, pager_port_type)))
{
printf ("Bad lock completed\n");
return EOPNOTSUPP;
}
if (control != p->memobjcntl)
{
printf ("lock_completed: bad control port\n");
ports_done_with_port (p);
return EPERM;
}
mach_port_deallocate (mach_task_self (), control);
mutex_lock (&p->interlock);
_pager_wait_for_seqno (p, seqno);
for (lr = p->lock_requests; lr; lr = lr->next)
if (lr->start == offset && lr->end == offset + length
&& !--lr->locks_pending && !lr->pending_writes)
break;
if (lr)
condition_broadcast (&p->wakeup);
_pager_release_seqno (p, seqno);
mutex_unlock (&p->interlock);
ports_done_with_port (p);
return 0;
}
|
