On Saturday 28 February 2009 15:07:05 Jamie Lokier wrote: > Michael Schnell wrote: > > >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. > > It only uses FUTEX if the pthread library is NPTL, and I don't think > that's available for ARM no-MMU at the moment.
i believe David Howells has down a lot of work to get futex's working on no- mmu. but that doesnt mean the syscall has been added and people have actually tested it yet ... -mike
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