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eCos Reference Manual
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Enhanced Select()

The network stack supports an extension to the standard select +semantics which allows all threads that are waiting to be restarted +even if the select conditions are not satisfied.

The standard select() API: 

int  
+select(int nfd,
+       fd_set *in, fd_set *out, fd_set *ex,
+       struct timeval *tv);

does not support the restart.

The additional API: 

int  
+cyg_select_with_abort(int nfd,
+       fd_set *in, fd_set *out, fd_set *ex,
+       struct timeval *tv)

behaves exactly as select() with the additional feature that +a call to

void cyg_select_abort(void)

will cause all threads waiting in any +cyg_select_with_abort() call +to cease waiting and continue execution.

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