#: 21271 S12/OS9/68000 (OSK)
    17-Nov-95  15:40:26
Sb: OS-9 Ver 3.0 Bug
Fm: Paul N. Leonard 72477,774
To: all

                     ////// OS-9 Version 3.0 BUG //////

     The tsleep() function behaves differently in version 3.0 than
     it prior to version 3.0,  and the result is very intermittent
     and can lock up your task.  We had created  a  macro  called
     hard_tsleep() to insure that we slept for a specified period.
     It worked fine before we started using OS-9 ver. 3.0.

     In  OS-9  version 3.0  tsleep(1)  returns  1,  not  0!  This
     causes the first macro below to loop endlessly. If you do any
     sort of checking for tsleep returning 0, you may want to keep
     this in mind.

     /* original version, works under OS-9 prior to version 3.0 */ #define
hard_tsleep(T)    { unsigned l; l=(T); while ((l=tsleep(l))!=0); }

     /* new version, overcomes bug in OS-9 version 3.0 */ #define
hard_tsleep(T)    { unsigned l; l=(T); while ((l=tsleep(l)) >1); }


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