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
|
#include <time.h>
#include "pthread_impl.h"
struct ksigevent {
union sigval sigev_value;
int sigev_signo;
int sigev_notify;
int sigev_tid;
};
struct start_args {
pthread_barrier_t b;
struct sigevent *sev;
};
static void dummy_1(pthread_t self)
{
}
weak_alias(dummy_1, __pthread_tsd_run_dtors);
static void cleanup_fromsig(void *p)
{
pthread_t self = __pthread_self();
self->cancel = 0;
self->cancelbuf = 0;
__pthread_tsd_run_dtors(self);
longjmp(p, 1);
}
void __sigtimer_handler(pthread_t self)
{
jmp_buf jb;
void (*notify)(union sigval) = (void (*)(union sigval))self->start;
union sigval val = { .sival_ptr = self->start_arg };
if (setjmp(jb)) return;
pthread_cleanup_push(cleanup_fromsig, jb);
notify(val);
pthread_cleanup_pop(0);
}
static void *start(void *arg)
{
pthread_t self = __pthread_self();
struct start_args *args = arg;
/* Reuse no-longer-needed thread structure fields to avoid
* needing the timer address in the signal handler. */
self->start = (void *(*)(void *))args->sev->sigev_notify_function;
self->start_arg = args->sev->sigev_value.sival_ptr;
self->result = (void *)-1;
pthread_barrier_wait(&args->b);
__wait(&self->delete_timer, 0, 0, 1);
__syscall(SYS_timer_delete, self->result);
return 0;
}
int timer_create(clockid_t clk, struct sigevent *evp, timer_t *res)
{
pthread_t td;
pthread_attr_t attr;
int r;
struct start_args args;
struct ksigevent ksev, *ksevp=0;
int timerid;
switch (evp ? evp->sigev_notify : SIGEV_SIGNAL) {
case SIGEV_NONE:
case SIGEV_SIGNAL:
if (evp) {
ksev.sigev_value = evp->sigev_value;
ksev.sigev_signo = evp->sigev_signo;
ksev.sigev_notify = evp->sigev_notify;
ksev.sigev_tid = 0;
ksevp = &ksev;
}
if (syscall(SYS_timer_create, clk, ksevp, &timerid) < 0)
return -1;
*res = (void *)timerid;
break;
case SIGEV_THREAD:
if (evp->sigev_notify_attributes)
attr = *evp->sigev_notify_attributes;
else
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_barrier_init(&args.b, 0, 2);
args.sev = evp;
r = pthread_create(&td, &attr, start, &args);
if (r) {
errno = r;
return -1;
}
ksev.sigev_value.sival_ptr = 0;
ksev.sigev_signo = SIGCANCEL;
ksev.sigev_notify = 4; /* SIGEV_THREAD_ID */
ksev.sigev_tid = td->tid;
r = syscall(SYS_timer_create, clk, &ksev, &timerid);
pthread_barrier_wait(&args.b);
if (r < 0) {
pthread_cancel(td);
return -1;
}
td->result = (void *)timerid;
*res = td;
break;
default:
errno = EINVAL;
return -1;
}
return 0;
}
|
