1 | #include <pthread.h>
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2 | #include <time.h>
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3 | #include <errno.h>
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4 | #include "futex.h"
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5 | #include "syscall.h"
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6 | #include "pthread_impl.h"
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7 |
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8 | int __pthread_setcancelstate(int, int *);
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9 | int __clock_gettime(clockid_t, struct timespec *);
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10 |
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11 | int __timedwait_cp(volatile int *addr, int val,
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12 | clockid_t clk, const struct timespec *at, int priv)
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13 | {
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14 | int r;
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15 | struct timespec to, *top=0;
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16 |
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17 | if (priv) priv = FUTEX_PRIVATE;
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18 |
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19 | if (at) {
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20 | if (at->tv_nsec >= 1000000000UL) return EINVAL;
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21 | if (__clock_gettime(clk, &to)) return EINVAL;
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22 | to.tv_sec = at->tv_sec - to.tv_sec;
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23 | if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
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24 | to.tv_sec--;
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25 | to.tv_nsec += 1000000000;
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26 | }
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27 | if (to.tv_sec < 0) return ETIMEDOUT;
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28 | top = &to;
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29 | }
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30 |
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31 | r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT|priv, val, top);
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32 | if (r == ENOSYS) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT, val, top);
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33 | if (r != EINTR && r != ETIMEDOUT && r != ECANCELED) r = 0;
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34 |
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35 | return r;
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36 | }
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37 |
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38 | int __timedwait(volatile int *addr, int val,
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39 | clockid_t clk, const struct timespec *at, int priv)
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40 | {
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41 | int cs, r;
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42 | __pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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43 | r = __timedwait_cp(addr, val, clk, at, priv);
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44 | __pthread_setcancelstate(cs, 0);
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45 | return r;
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46 | }
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