72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
#include <pthread.h>
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#include <time.h>
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#include <errno.h>
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#include "futex.h"
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#include "syscall.h"
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#include "pthread_impl.h"
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#define IS32BIT(x) !((x)+0x80000000ULL>>32)
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#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
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static int __futex4_cp(volatile void *addr, int op, int val, const struct timespec *to)
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{
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int r;
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#ifdef SYS_futex_time64
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time_t s = to ? to->tv_sec : 0;
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long ns = to ? to->tv_nsec : 0;
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r = -ENOSYS;
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if (SYS_futex == SYS_futex_time64 || !IS32BIT(s))
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r = __syscall_cp(SYS_futex_time64, addr, op, val,
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to ? ((long long[]){s, ns}) : 0);
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if (SYS_futex == SYS_futex_time64 || r!=-ENOSYS) return r;
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to = to ? (void *)(long[]){CLAMP(s), ns} : 0;
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#endif
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r = __syscall_cp(SYS_futex, addr, op, val, to);
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if (r != -ENOSYS) return r;
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return __syscall_cp(SYS_futex, addr, op & ~FUTEX_PRIVATE, val, to);
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}
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static volatile int dummy = 0;
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weak_alias(dummy, __eintr_valid_flag);
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int __timedwait_cp(volatile int *addr, int val,
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clockid_t clk, const struct timespec *at, int priv)
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{
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int r;
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struct timespec to, *top=0;
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if (priv) priv = FUTEX_PRIVATE;
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if (at) {
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if (at->tv_nsec >= 1000000000UL) return EINVAL;
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if (__clock_gettime(clk, &to)) return EINVAL;
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to.tv_sec = at->tv_sec - to.tv_sec;
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if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
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to.tv_sec--;
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to.tv_nsec += 1000000000;
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}
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if (to.tv_sec < 0) return ETIMEDOUT;
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top = &to;
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}
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r = -__futex4_cp(addr, FUTEX_WAIT|priv, val, top);
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if (r != EINTR && r != ETIMEDOUT && r != ECANCELED) r = 0;
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/* Mitigate bug in old kernels wrongly reporting EINTR for non-
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* interrupting (SA_RESTART) signal handlers. This is only practical
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* when NO interrupting signal handlers have been installed, and
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* works by sigaction tracking whether that's the case. */
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if (r == EINTR && !__eintr_valid_flag) r = 0;
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return r;
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}
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int __timedwait(volatile int *addr, int val,
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clockid_t clk, const struct timespec *at, int priv)
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{
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int cs, r;
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__pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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r = __timedwait_cp(addr, val, clk, at, priv);
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__pthread_setcancelstate(cs, 0);
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return r;
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}
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