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
|
#include <pthread.h>
#include <time.h>
#include <errno.h>
#include "futex.h"
#include "syscall.h"
#include "pthread_impl.h"
int __pthread_setcancelstate(int, int *);
int __clock_gettime(clockid_t, struct timespec *);
int __timedwait_cp(volatile int *addr, int val,
clockid_t clk, const struct timespec *at, int priv)
{
int r;
struct timespec to, *top=0;
if (priv) priv = FUTEX_PRIVATE;
if (at) {
if (at->tv_nsec >= 1000000000UL) return EINVAL;
if (__clock_gettime(clk, &to)) return EINVAL;
to.tv_sec = at->tv_sec - to.tv_sec;
if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
to.tv_sec--;
to.tv_nsec += 1000000000;
}
if (to.tv_sec < 0) return ETIMEDOUT;
top = &to;
}
r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT|priv, val, top);
if (r == ENOSYS) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT, val, top);
if (r != EINTR && r != ETIMEDOUT && r != ECANCELED) r = 0;
return r;
}
int __timedwait(volatile int *addr, int val,
clockid_t clk, const struct timespec *at, int priv)
{
int cs, r;
__pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
r = __timedwait_cp(addr, val, clk, at, priv);
__pthread_setcancelstate(cs, 0);
return r;
}
|
