On 02/12/2015 05:59 PM, Cyril Hrubis wrote:
> Hi!
> Code prototype follows. It uses mutexes and can be used with up to
> page_size/sizeof(uint32) pairs. I've checked that it compiles fine and
> works back to kernel 2.6.11 compiled in year 2005, which should be more
> than enough.
>
> It uses a regular file as a backing for the shared pages which makes it
> even easier to replace the fifo based solution we have. All that is
> needed is to map the same file created in the test temporary directory
> just like the fifo does.
>
> Please anone that uses LTP, check that the code compiles and works for
> fine on all distributions you care for. Once that is checked, I will
> write the new library functions based on this code and convert all the
> test to the new interface.
Thanks, works for me.
Some notes;
I assume you used syscall(SYS_futex, ..) instead of pthread_mutex (which
uses it internally) because of the linking simplicity, right?
Fair tradeoff.
No idea what you're going to use for the final code, but I'd default to
perror("open()");
instead of
fprintf(stderr, "open(): %s\n", strerror(errno));
(you also don't need errno.h for the former one).
>
>
> tfutex.c
>
>
> #include <fcntl.h>
> #include <stdint.h>
> #include <unistd.h>
> #include <limits.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <sys/mman.h>
> #include <sys/syscall.h>
> #include <linux/futex.h>
>
> #include <stdio.h>
> #include <string.h>
> #include <errno.h>
> #include <stdlib.h>
>
> typedef volatile uint32_t futex_t;
>
> static futex_t *futexes;
>
> static void finit(void)
> {
> int fd;
>
> fd = open("/tmp/syncronization_futex_base_file", O_RDWR | O_CREAT,
> 0666);
>
> if (fd < 0) {
> fprintf(stderr, "open(): %s\n", strerror(errno));
> exit(1);
> }
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