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#include <pthread.h>
#include <time.h>
#include <errno.h>
#include "futex.h"
#include "syscall.h"
static int do_wait(volatile int *addr, int val, clockid_t clk, const struct timespec *at, int cp, int priv)
{
int r, flag = 0;
struct timespec to, *top=0;
if (!at) goto notimeout;
if (at->tv_nsec >= 1000000000UL)
return EINVAL;
if (clk == CLOCK_REALTIME || clk == CLOCK_MONOTONIC) {
if (clk == CLOCK_REALTIME) flag = FUTEX_CLOCK_REALTIME;
if (cp) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
else r = -__syscall(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
if (r != EINVAL) goto done;
}
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;
notimeout:
if (cp) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT, val, top);
else r = -__syscall(SYS_futex, addr, FUTEX_WAIT, val, top);
done:
if (r == EINTR || r == EINVAL || r == ETIMEDOUT) return r;
return 0;
}
int __timedwait(volatile int *addr, int val, clockid_t clk, const struct timespec *at, void (*cleanup)(void *), void *arg, int priv)
{
int r;
if (cleanup) {
pthread_cleanup_push(cleanup, arg);
r = do_wait(addr, val, clk, at, 1, priv);
pthread_cleanup_pop(0);
} else {
r = do_wait(addr, val, clk, at, 0, priv);
}
return r;
}
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