event semaphore mechanism in Linux

["arun4linux" <arun4linux@indiatimes.com>]

Hi All,

  I'm involved in migrating an OS/2 system to Linux, which involves applications as well as drivers.

  I have some doubts/questions on implementing asynchronous,
repeated-interval timer mechanism with semaphore support.
	I meant porting Event Semaphores available in OS/2 to Linux.
(DosCreateEventSem,DosWaitEventSem,DosResetEventSem,DosPostEventSem)

  My need is to have semaphores which will be signalled (posted)
repeated-interval timer mechanis asynchronously.
  In other words,
                I need to implement asynchronous, repeated-interval
timer mechanism with semaphore support.

  We thought of using condition variable (pthread_cond_init, etc..)
and mutex combination to achieve this.

  But it seems pthread's mutex and condition variable synchronization
calls are off limits.  pthread mutex-locking routines are not
asynchronous signal safe.

	It would be helpful, if I could get to know on how to achieve this
event semaphore mechanism in Linux.

	Have a nice time.
  
Warm Regards
Arun



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