summaryrefslogtreecommitdiff
path: root/libpager/object-terminate.c
blob: dc53541ce252633a257573ec5fd463f06202b7d2 (plain)
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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/* Implementation of memory_object_terminate for pager library
   Copyright (C) 1994, 1995, 1996, 1999, 2000 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>

/* Implement the object termination call from the kernel as described
   in <mach/memory_object.defs>. */
kern_return_t
_pager_seqnos_memory_object_terminate (mach_port_t object, 
				       mach_port_seqno_t seqno,
				       mach_port_t control,
				       mach_port_t name)
{
  struct pager *p;
  
  p = ports_lookup_port (0, object, _pager_class);
  if (!p)
    return EOPNOTSUPP;

  mutex_lock (&p->interlock);
  _pager_wait_for_seqno (p, seqno);
  
  if (control != p->memobjcntl)
    {
      printf ("incg terminate: wrong control port");
      goto out;
    }
  if (name != p->memobjname)
    {
      printf ("incg terminate: wrong name port");
      goto out;
    }

  while (p->noterm)
    {
      p->termwaiting = 1;
      condition_wait (&p->wakeup, &p->interlock);
    }

  /* Destry the ports we received; mark that in P so that it doesn't bother
     doing it again. */
  mach_port_destroy (mach_task_self (), control);
  mach_port_destroy (mach_task_self (), name);
  p->memobjcntl = p->memobjname = MACH_PORT_NULL;

  _pager_free_structure (p);

#ifdef KERNEL_INIT_RACE
  if (p->init_head)
    {
      struct pending_init *i = p->init_head;
      p->init_head = i->next;
      if (!i->next)
	p->init_tail = 0;
      p->memobjcntl = i->control;
      p->memobjname = i->name;
      memory_object_ready (i->control, p->may_cache, p->copy_strategy);
      p->pager_state = NORMAL;
      free (i);
    }
#endif

 out:
  _pager_release_seqno (p, seqno);
  mutex_unlock (&p->interlock);
  ports_port_deref (p);

  return 0;
}

/* Shared code for termination from memory_object_terminate and
   no-senders.  The pager must be locked.  This routine will
   deallocate all the ports and memory that pager P references.  */
void
_pager_free_structure (struct pager *p)
{
  int wakeup;
  struct lock_request *lr;
  struct attribute_request *ar;

  wakeup = 0;
  for (lr = p->lock_requests; lr; lr = lr->next)
    {
      lr->locks_pending = 0;
      if (!lr->pending_writes)
	wakeup = 1;
    }
  for (ar = p->attribute_requests; ar; ar = ar->next)
    {
      ar->attrs_pending = 0;
      wakeup = 1;
    }

  if (wakeup)
    condition_broadcast (&p->wakeup);

  if (p->memobjcntl != MACH_PORT_NULL)
    {
      mach_port_deallocate (mach_task_self (), p->memobjcntl);
      p->memobjcntl = MACH_PORT_NULL;
    }
  if (p->memobjname != MACH_PORT_NULL)
    {
      mach_port_deallocate (mach_task_self (), p->memobjname);
      p->memobjname = MACH_PORT_NULL;
    }

  /* Free the pagemap */
  if (p->pagemapsize)
    {
      munmap (p->pagemap, p->pagemapsize * sizeof (* p->pagemap));
      p->pagemapsize = 0;
      p->pagemap = 0;
    }
  
  p->pager_state = NOTINIT;
}