I use basic_managed_mapped_file and I want to backup the file while the program is running.
How can I make sure the data is written to disk for the backup?
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The answer is logically "yes".
The operating system will make sure that the data is written, I believe even if your process would crash next.
However, if you
- must be sure that the data hit the disk before doing anything else
- need to ensure that data hits the disk in any particular order (e.g. journaling/intent logging)
- need to be sure that data is safely written in the face of e.g. power failure
then you will need to add a disk sync call on most OS-es. If you require this level of detail (and worse, in portable fashion), the topic quickly becomes hard, and I defer to
eat my data: how everybody gets file IO wrong from Stewart Smith
I've also mirrored the video/slides just in case (see here)
