Copy or move file into directory with parallel processing from another process

问题

I'm running two processes on AIX. Process one is generating several files, process two does backups from all files that are in a backup directory.

Process one will copy or move the files into the backup directory. Since process two is always running in the background there is the risk of it starting a backup of a file that is still in the process of being copied or moved and therefore incomplete. How can I avoid this problem?

回答1:

Process one should create files in another directory (on the same disk); and when a file is created, move it into the final directory. Move is an atomic operation, so process2 will only find complete files.

Edit: on AIX, /usr/bin/istat helps to make sure that two directories (or files) are on the same disk/partition/device, e.g.

for Dir in /home /home/zsiga /tmp;
    do /usr/bin/istat "$Dir" | grep device;
done

Result:

Inode  2 on device 10/8 Directory
Inode 33 on device 10/8 Directory
Inode  2 on device 10/7 Directory

The first two are on the same disk/partition/device (10/8); the last one is on another device (10/7)

来源：https://stackoverflow.com/questions/59856442/copy-or-move-file-into-directory-with-parallel-processing-from-another-process