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
|
/*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <signal.h>
#include <errno.h>
#include <pthread.h>
#include <string.h>
#include <sys/signalvar.h>
#include "thr_private.h"
__weak_reference(__sigsuspend, sigsuspend);
int
_sigsuspend(const sigset_t *set)
{
struct pthread *curthread = _get_curthread();
sigset_t oldmask, newmask, tempset;
int ret = -1;
if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
return (__sys_sigsuspend(set));
/* Check if a new signal set was provided by the caller: */
if (set != NULL) {
newmask = *set;
SIG_CANTMASK(newmask);
THR_LOCK_SWITCH(curthread);
/* Save current sigmask: */
oldmask = curthread->sigmask;
curthread->oldsigmask = &oldmask;
/* Change the caller's mask: */
curthread->sigmask = newmask;
tempset = curthread->sigpend;
SIGSETNAND(tempset, newmask);
if (SIGISEMPTY(tempset)) {
THR_SET_STATE(curthread, PS_SIGSUSPEND);
/* Wait for a signal: */
_thr_sched_switch_unlocked(curthread);
} else {
curthread->check_pending = 1;
THR_UNLOCK_SWITCH(curthread);
/* check pending signal I can handle: */
_thr_sig_check_pending(curthread);
}
THR_ASSERT(curthread->oldsigmask == NULL,
"oldsigmask is not cleared");
/* Always return an interrupted error: */
errno = EINTR;
} else {
/* Return an invalid argument error: */
errno = EINVAL;
}
/* Return the completion status: */
return (ret);
}
int
__sigsuspend(const sigset_t * set)
{
struct pthread *curthread = _get_curthread();
int ret;
_thr_cancel_enter(curthread);
ret = _sigsuspend(set);
_thr_cancel_leave(curthread, 1);
return (ret);
}
|
