Attachment 313643 Details for Bug 429290 – program to test availability of FUTEX_WAIT_BITSET

program to test availability of FUTEX_WAIT_BITSET

futex-wait-bitset.c (text/x-csrc), 958 bytes, created by Clark Williams on 2008-08-06 21:07:03 UTC

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Filename:

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Creator: Clark Williams

Created: 2008-08-06 21:07:03 UTC

Size: 958 bytes

patch

obsolete

>#include <stdio.h>
>#include <time.h>
>#include <stdlib.h>
>#include <errno.h>
>#include <sys/types.h>
>#include <sys/syscall.h>
>#include <linux/futex.h>
>
>
>/* this test program proves that the kernel is calling the
>   FUTEX_WAIT_BITSET operation and that it will timeout with
>   an absolute timeout value */
>
>int fake_futex = 0;  
>
>int main (int argc, char **argv)
>{
>	int status;
>	struct timespec start, ts, now;
>
>	status = clock_gettime(CLOCK_MONOTONIC, &start);
>
>
>	/* wait for one second */
>	ts = start;
>	ts.tv_sec += 1;
>
>	status = syscall(SYS_futex, 
>			 &fake_futex, 
>			 FUTEX_WAIT_BITSET, 
>			 0, 
>			 &ts, 
>			 0, 
>			 FUTEX_BITSET_MATCH_ANY);
>
>	if (status == -1 && (errno != ETIMEDOUT)) {
>		perror("futex");
>		exit(errno);
>	}
>
>	status = clock_gettime(CLOCK_MONOTONIC, &now);
>
>	if ((now.tv_sec < start.tv_sec) ||
>	    (now.tv_nsec < start.tv_nsec)) {
>		fprintf(stderr, "timeout didn't work!\n");
>		exit(-1);
>	}
>	printf ("operation worked!\n");
>	exit(0);
>}

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Attachments on bug 429290: 313643