As I intend to port FP to a non MMU architecture at some point in the
future I came across this issue:
In the RTL there are some functions that do a fork. The RTL supports as
well calling fork() as vfork() API (via fpFork and fpVFork).
Here a setting USE_VFORK is acknowledged to decide which one is to be used.
Questions:
- not in all instances the difference is provided. sometimes fork() is
done unconditionally
- Why is fork used at all. AFAIK, all systems can do vfork() (with
_at_least_ the same performance as fork() and thus the difference is not
needed. Regarding the function there is a difference between fork() and
vfork() only if exec?() is _not_ called immediately afterwards, which
seems to be the case in the FP RTL.
- vfork seems to be used in BSD and SUNOS. Why just in these systems ?
- when doing a non-MMU (µCLinux) architecture fork is not available.
What is the best way of handling that situation ? (Should we introduce a
UCLINUX OS flavor ?)
-Michael
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