4) Can pthread mutexes be used across vfork/exec sub-processes?
In documentation to pthreads they say that the pthread_mutex can be
used to synchronize threads but not processes. But I see no difference
between thread and process in uClinux. What am I missing?
To do threads you should use the pthread library. So you don't bother
about (v)fork-ing the threads. pthreadlib also provides the thread-mutex
methods and supposedly will use FUTEX (fast user space Mutex) instead of
mutex, which is a lot faster if the architecture provides appropriate
support.
You will manually use (v)fork and *exec only to spawn an independent
process (which you need to consider having a separate address space that
can't be accessed by the parent process).
-Michael
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