1 /* Copyright (C) 2001-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
29 gai_suspend (const struct gaicb
*const list
[], int ent
,
30 const struct timespec
*timeout
)
32 struct waitlist waitlist
[ent
];
33 struct requestlist
*requestlist
[ent
];
34 #ifndef DONT_NEED_GAI_MISC_COND
35 pthread_cond_t cond
= PTHREAD_COND_INITIALIZER
;
38 unsigned int cntr
= 1;
42 /* Request the mutex. */
43 pthread_mutex_lock (&__gai_requests_mutex
);
45 /* There is not yet a finished request. Signal the request that
46 we are working for it. */
47 for (cnt
= 0; cnt
< ent
; ++cnt
)
48 if (list
[cnt
] != NULL
&& list
[cnt
]->__return
== EAI_INPROGRESS
)
50 requestlist
[cnt
] = __gai_find_request (list
[cnt
]);
52 if (requestlist
[cnt
] != NULL
)
54 #ifndef DONT_NEED_GAI_MISC_COND
55 waitlist
[cnt
].cond
= &cond
;
57 waitlist
[cnt
].next
= requestlist
[cnt
]->waiting
;
58 waitlist
[cnt
].counterp
= &cntr
;
59 waitlist
[cnt
].sigevp
= NULL
;
60 waitlist
[cnt
].caller_pid
= 0; /* Not needed. */
61 requestlist
[cnt
]->waiting
= &waitlist
[cnt
];
69 /* There is an entry which is finished. */
76 /* There is no request done but some are still being worked on. */
79 /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
80 points we must be careful. We added entries to the waiting lists
81 which we must remove. So defer cancelation for now. */
82 pthread_setcancelstate (PTHREAD_CANCEL_DISABLE
, &oldstate
);
84 #ifdef DONT_NEED_GAI_MISC_COND
86 GAI_MISC_WAIT (result
, cntr
, timeout
, 1);
89 result
= pthread_cond_wait (&cond
, &__gai_requests_mutex
);
92 /* We have to convert the relative timeout value into an
93 absolute time value with pthread_cond_timedwait expects. */
95 struct timespec abstime
;
97 __gettimeofday (&now
, NULL
);
98 abstime
.tv_nsec
= timeout
->tv_nsec
+ now
.tv_usec
* 1000;
99 abstime
.tv_sec
= timeout
->tv_sec
+ now
.tv_sec
;
100 if (abstime
.tv_nsec
>= 1000000000)
102 abstime
.tv_nsec
-= 1000000000;
106 result
= pthread_cond_timedwait (&cond
, &__gai_requests_mutex
,
111 /* Now remove the entry in the waiting list for all requests
112 which didn't terminate. */
113 for (cnt
= 0; cnt
< ent
; ++cnt
)
114 if (list
[cnt
] != NULL
&& list
[cnt
]->__return
== EAI_INPROGRESS
115 && requestlist
[cnt
] != NULL
)
117 struct waitlist
**listp
= &requestlist
[cnt
]->waiting
;
119 /* There is the chance that we cannot find our entry anymore.
120 This could happen if the request terminated and restarted
122 while (*listp
!= NULL
&& *listp
!= &waitlist
[cnt
])
123 listp
= &(*listp
)->next
;
126 *listp
= (*listp
)->next
;
129 /* Now it's time to restore the cancelation state. */
130 pthread_setcancelstate (oldstate
, NULL
);
132 #ifndef DONT_NEED_GAI_MISC_COND
133 /* Release the conditional variable. */
134 if (pthread_cond_destroy (&cond
) != 0)
135 /* This must never happen. */
141 /* An error occurred. Possibly it's EINTR. We have to translate
142 the timeout error report of `pthread_cond_timedwait' to the
143 form expected from `gai_suspend'. */
144 if (__builtin_expect (result
, ETIMEDOUT
) == ETIMEDOUT
)
146 else if (result
== EINTR
)
153 /* Release the mutex. */
154 pthread_mutex_unlock (&__gai_requests_mutex
);