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https://github.com/fluencelabs/musl
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a113434cd6
1. make sem_[timed]wait interruptible by signals, per POSIX 2. keep a waiter count in order to avoid unnecessary futex wake syscalls
24 lines
618 B
C
24 lines
618 B
C
#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 <stdio.h>
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int __timedwait(volatile int *addr, int val, 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;
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if (at) {
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clock_gettime(clk, &to);
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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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}
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if (priv) priv = 128; priv=0;
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r = -__syscall(__NR_futex, (long)addr, FUTEX_WAIT | priv, val, at ? (long)&to : 0);
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if (r == ETIMEDOUT || r == EINTR) return r;
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return 0;
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}
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