about summary refs log tree commit diff
path: root/sysdeps/pthread/lio_listio64.c
blob: 0249a05c1355087584bf146f9d58076c784ca0cc (plain) (blame)
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/* Enqueue and list of read or write requests, 64bit offset version.
   Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <aio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>

#include "aio_misc.h"


/* We need this special structure to handle asynchronous I/O.  */
struct async_waitlist
  {
    int counter;
    struct sigevent sigev;
    struct waitlist list[0];
  };


int
lio_listio64 (mode, list, nent, sig)
     int mode;
     struct aiocb64 *const list[];
     int nent;
     struct sigevent *sig;
{
  struct requestlist *requests[nent];
  int cnt;
  volatile int total = 0;
  int result = 0;

  /* Check arguments.  */
  if (mode != LIO_WAIT && mode != LIO_NOWAIT)
    {
      __set_errno (EINVAL);
      return -1;
    }

  /* Request the mutex.  */
  pthread_mutex_lock (&__aio_requests_mutex);

  /* Now we can enqueue all requests.  Since we already acquired the
     mutex the enqueue function need not do this.  */
  for (cnt = 0; cnt < nent; ++cnt)
    if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
      {
	requests[cnt] = __aio_enqueue_request ((aiocb_union *) list[cnt],
					       (list[cnt]->aio_lio_opcode
						| 128));
	if (requests[cnt] != NULL)
	  /* Successfully enqueued.  */
	  ++total;
	else
	  /* Signal that we've seen an error.  `errno' and the error code
	     of the aiocb will tell more.  */
	  result = -1;
      }

  if (total == 0)
    {
      /* We don't have anything to do except signalling if we work
	 asynchronously.  */

      /* Release the mutex.  We do this before raising a signal since the
	 signal handler might do a `siglongjmp' and then the mutex is
	 locked forever.  */
      pthread_mutex_unlock (&__aio_requests_mutex);

      if (mode == LIO_NOWAIT)
	__aio_notify_only (sig,
			   sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0);

      return result;
    }
  else if (mode == LIO_WAIT)
    {
      pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
      struct waitlist waitlist[nent];
      int oldstate;

      total = 0;
      for (cnt = 0; cnt < nent; ++cnt)
	if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP
	    && requests[cnt] != NULL)
	  {
	    waitlist[cnt].cond = &cond;
	    waitlist[cnt].next = requests[cnt]->waiting;
	    waitlist[cnt].counterp = &total;
	    waitlist[cnt].sigevp = NULL;
	    waitlist[cnt].caller_pid = 0;	/* Not needed.  */
	    requests[cnt]->waiting = &waitlist[cnt];
	    ++total;
	  }

      /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
	 points we must be careful.  We added entries to the waiting lists
	 which we must remove.  So defer cancelation for now.  */
      pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);

      while (total > 0)
	pthread_cond_wait (&cond, &__aio_requests_mutex);

      /* Now it's time to restore the cancelation state.  */
      pthread_setcancelstate (oldstate, NULL);

      /* Release the conditional variable.  */
      if (pthread_cond_destroy (&cond) != 0)
	/* This must never happen.  */
	abort ();
    }
  else
    {
      struct async_waitlist *waitlist;

      waitlist = (struct async_waitlist *)
	malloc (sizeof (struct async_waitlist)
		+ (nent * sizeof (struct waitlist)));

      if (waitlist == NULL)
	{
	  __set_errno (EAGAIN);
	  result = -1;
	}
      else
	{
	  pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0;
	  total = 0;

	  for (cnt = 0; cnt < nent; ++cnt)
	    if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP
		&& requests[cnt] != NULL)
	      {
		waitlist->list[cnt].cond = NULL;
		waitlist->list[cnt].next = requests[cnt]->waiting;
		waitlist->list[cnt].counterp = &waitlist->counter;
		waitlist->list[cnt].sigevp = &waitlist->sigev;
		waitlist->list[cnt].caller_pid = caller_pid;
		requests[cnt]->waiting = &waitlist->list[cnt];
		++total;
	      }

	  waitlist->counter = total;
	  waitlist->sigev = *sig;
	}
    }

  /* Release the mutex.  */
  pthread_mutex_unlock (&__aio_requests_mutex);

  return result;
}