Hi There's a problem with backends (plustek in my case) that use fork() on MacOSX. Due to the IOKit it's impossible that two processes access the USB at the same time.
I solved the problem by replacing the child process by a pthread. The problem: There are about 15 #ifdefs in plustek.c (quite ugly) and I had to modify the Plustek_Scanner struct. The solution for OS/2 (sanei_thread) didn't seem very useful for my problem because I had to apply changes to several functions. Im not an experienced (cross platform) developer. Any ideas for an elegant solution to implement the pthreads stuff for MacOSX/Darwin? I uploaded the files with my changes (it's a quickhack!): http://www.vseth.ethz.ch/~birkhofer/plustek.c http://www.vseth.ethz.ch/~birkhofer/plustek.h Regards Beat H.
