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
|
/* Wait for thread termination.
Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <pthread.h>
#include <stddef.h>
#include <pt-internal.h>
/* Make calling thread wait for termination of thread THREAD. Return
the exit status of the thread in *STATUS. */
int
pthread_join (pthread_t thread, void **status)
{
struct __pthread *pthread;
int err = 0;
/* Lookup the thread structure for THREAD. */
pthread = __pthread_getid (thread);
if (pthread == NULL)
return ESRCH;
__pthread_mutex_lock (&pthread->state_lock);
pthread_cleanup_push (__pthread_mutex_unlock, &pthread->state_lock);
while (pthread->state == PTHREAD_JOINABLE)
pthread_cond_wait (&pthread->state_cond, &pthread->state_lock);
pthread_cleanup_pop (0);
switch (pthread->state)
{
case PTHREAD_EXITED:
__pthread_mutex_unlock (&pthread->state_lock);
/* THREAD has already exited. Salvage its exit status. */
if (status)
*status = pthread->status;
/* Make sure nobody can reference it anymore, and mark it as
terminated. */
assert (pthread->stack);
__pthread_stack_dealloc (pthread->stackaddr, pthread->stacksize);
pthread->stack = 0;
__pthread_dealloc (pthread);
break;
case PTHREAD_TERMINATED:
/* Pretend THREAD wasn't there in the first place. */
__pthread_mutex_unlock (&pthread->state_lock);
err = ESRCH;
break;
default:
/* Thou shalt not join non-joinable threads! */
__pthread_mutex_unlock (&pthread->state_lock);
err = EINVAL;
break;
}
return err;
}
|
