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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/* Suspend until termination of a requests.
Copyright (C) 1997-2000,2002,2003,2005,2006 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. */
/* We use an UGLY hack to prevent gcc from finding us cheating. The
implementations of aio_suspend and aio_suspend64 are identical and so
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_suspend64 has no prototype. */
#define aio_suspend64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_suspend64
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/time.h>
#include <bits/libc-lock.h>
#include <aio_misc.h>
struct clparam
{
const struct aiocb *const *list;
struct waitlist *waitlist;
struct requestlist **requestlist;
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int nent;
};
static void
cleanup (void *arg)
{
#ifdef DONT_NEED_AIO_MISC_COND
/* Acquire the mutex. If pthread_cond_*wait is used this would
happen implicitly. */
pthread_mutex_lock (&__aio_requests_mutex);
#endif
const struct clparam *param = (const struct clparam *) arg;
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
int cnt = param->nent;
while (cnt-- > 0)
if (param->list[cnt] != NULL
&& param->list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (param->requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = ¶m->requestlist[cnt]->waiting;
while (*listp != NULL && *listp != ¶m->waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
(void) pthread_cond_destroy (param->cond);
#endif
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
int
aio_suspend (list, nent, timeout)
const struct aiocb *const list[];
int nent;
const struct timespec *timeout;
{
if (__builtin_expect (nent < 0, 0))
{
__set_errno (EINVAL);
return -1;
}
struct waitlist waitlist[nent];
struct requestlist *requestlist[nent];
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
int cnt;
bool any = false;
int result = 0;
int cntr = 1;
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* There is not yet a finished request. Signal the request that
we are working for it. */
for (cnt = 0; cnt < nent; ++cnt)
if (list[cnt] != NULL)
{
if (list[cnt]->__error_code == EINPROGRESS)
{
requestlist[cnt] = __aio_find_req ((aiocb_union *) list[cnt]);
if (requestlist[cnt] != NULL)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].result = NULL;
waitlist[cnt].next = requestlist[cnt]->waiting;
waitlist[cnt].counterp = &cntr;
waitlist[cnt].sigevp = NULL;
#ifdef BROKEN_THREAD_SIGNALS
waitlist[cnt].caller_pid = 0; /* Not needed. */
#endif
requestlist[cnt]->waiting = &waitlist[cnt];
any = true;
}
else
/* We will never suspend. */
break;
}
else
/* We will never suspend. */
break;
}
/* Only if none of the entries is NULL or finished to be wait. */
if (cnt == nent && any)
{
struct clparam clparam =
{
.list = list,
.waitlist = waitlist,
.requestlist = requestlist,
#ifndef DONT_NEED_AIO_MISC_COND
.cond = &cond,
#endif
.nent = nent
};
pthread_cleanup_push (cleanup, &clparam);
#ifdef DONT_NEED_AIO_MISC_COND
AIO_MISC_WAIT (result, cntr, timeout, 1);
#else
if (timeout == NULL)
result = pthread_cond_wait (&cond, &__aio_requests_mutex);
else
{
/* We have to convert the relative timeout value into an
absolute time value with pthread_cond_timedwait expects. */
struct timeval now;
struct timespec abstime;
__gettimeofday (&now, NULL);
abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000;
abstime.tv_sec = timeout->tv_sec + now.tv_sec;
if (abstime.tv_nsec >= 1000000000)
{
abstime.tv_nsec -= 1000000000;
abstime.tv_sec += 1;
}
result = pthread_cond_timedwait (&cond, &__aio_requests_mutex,
&abstime);
}
#endif
pthread_cleanup_pop (0);
}
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
while (cnt-- > 0)
if (list[cnt] != NULL && list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = &requestlist[cnt]->waiting;
while (*listp != NULL && *listp != &waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
if (__builtin_expect (pthread_cond_destroy (&cond) != 0, 0))
/* This must never happen. */
abort ();
#endif
if (result != 0)
{
#ifndef DONT_NEED_AIO_MISC_COND
/* An error occurred. Possibly it's ETIMEDOUT. We have to translate
the timeout error report of `pthread_cond_timedwait' to the
form expected from `aio_suspend'. */
if (result == ETIMEDOUT)
__set_errno (EAGAIN);
else
#endif
__set_errno (result);
result = -1;
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
weak_alias (aio_suspend, aio_suspend64)
|
