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
|
/* $OpenBSD: rthread_sig.c,v 1.5 2008/04/24 11:44:26 kurt Exp $ */
/*
* Copyright (c) 2005 Ted Unangst <tedu@openbsd.org>
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* signals
*/
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <machine/spinlock.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include "rthread.h"
int
pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
{
return (sigprocmask(how, set, oset) ? errno : 0);
}
/*
* implementation of sigwait:
* 1. we install a handler for each masked signal.
* 2. we inform the kernel we are interested in this signal set.
* 3. sleep. the handler will wake us up.
*
* this is atomic because the kernel will only divert one signal
* to a thread until it asks for more.
*/
static void
sigwait_handler(int sig)
{
pthread_t self = pthread_self();
self->sigpend = sig;
thrwakeup(&self->sigpend, 0);
}
typedef void (*sigfn)(int);
int
sigwait(const sigset_t *set, int *sig)
{
int i;
sigset_t mask = *set;
pthread_t self = pthread_self();
sigfn oldhandlers[NSIG];
for (i = 0; i < NSIG; i++) {
if (mask & (1 << i))
oldhandlers[i] = signal(i, sigwait_handler);
}
thrsigdivert(set);
thrsleep(&self->sigpend, 0, NULL);
for (i = 0; i < NSIG; i++) {
if (mask & (1 << i))
signal(i, oldhandlers[i]);
}
*sig = self->sigpend;
return (0);
}
|
