[dpdk-dev] About the shared flock for hugepage files

[白长敏]

Hi, everyone,


    I'm a developer from china, now i have a problem is about the shared flock for hugepage files in the function of "map_all_hugepages()".


as follows:
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/* set shared flock on the file. */


if (flock(fd, LOCK_SH | LOCK_NB) == -1) {


        RTE_LOG(DEBUG, EAL, "%s(): Locking file failed:%s \n", __func__, strerror(errno));


        close(fd);


        return i;


}


close(fd);

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there, it gives a shared flock to each hugepage file in /mnt/huge, and close it right away. 


it makes me puzzled. Why? What doing that is for? 


I'm looking forward to your reply, thank you very much.


best regards,
Bakari.