contiki/tools/chakana/CYGWIN_USERS.txt

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If you're on Cygwin and run into the 'sem_init: Resource temporarily unavailable' problem:
Current Cygwin python versions have problems with running out of PIDs, it is a known problem and there has been several discussions and bugreports related to it.
As of today, the best solution seems to be to rebase the Cygwin libraries:
0> Make sure you have the rebaseall program, it can be downloaded using Cygwin's setup.exe
1> Shut down all Cygwin processes and services (including shells)
2> Start a regular Win command prompt ('cmd')
3> Start 'ash'
4> Start '/bin/rebaseall', expect this step to take some time..
5> All done! This worked for me.
-- Fredrik <fros@sics.se>, 2007