I would like to use POSIX semaphores (sem_open(), sem_wait(), sem_post(), etc.)
in a uClinux/uClibc system. In the 20100315 distribution, the uClibc version
is still old enough that these functions are not implemented (well, they are,
but they simply return an errno indicating "function does not exist").
I think that the newest uClibc's do have these functions implemented. Can I
simply drop a newer uClibc into an existing uClinux-dist without introducing
too many problems? Alternately, should I consider just lifting the
implementations of the functions I need from a newer uClibc and then compiling
them into my system which is still based on the older uClibc, or is that asking
for trouble?
Also, the POSIX semaphore functions that do exist (the ones for unnamed
semaphores) appear to be implemented in a very pthread specific way. Since
I'm synchronizing access to shared memory regions between two _processes_,
would the uClibc implementations even work for me at all?
Is there an altogether different mutual exclusion locking mechanism that I
should consider using?
Thanks for any advice,
--Dave
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