| Title: | -={ H A C K E R S }=- |
| Notice: | Write locked - see NOTED::HACKERS |
| Moderator: | DIEHRD::MORRIS |
| Created: | Thu Feb 20 1986 |
| Last Modified: | Mon Aug 03 1992 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 680 |
| Total number of notes: | 5456 |
I have a process which creates a detached process and passes it commands via a a global section. the detached process simply waits for an event flag to set, indicating a command is in the section. Once it completes the command, it clears the event flag, signalling the main process the command is complete. Whats the best way to wait for an event flag to CLEAR? I figure a crude way is: while (sys$readef(,,) != SS$WASCLR) /* No timeout check here for simplicity */ sleep(some_small_time); Is this ok? Seems like if the sleep time is too small, this loop will eat CPU. I need a SYS$WFEFCLR(efn) (wait for event flag to CLEAR!) :-)
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 568.1 | CASEE::VANDENHEUVEL | Hein, Valbonne. | Wed Sep 30 1987 11:29 | 17 | |
Standard problem.
Pick you choice from some possible solutions.
- Add second event flag to flag back.
- Check our ENQ/DEQ possibilities.
- Have the originaing process go to sleep ($HIBER)
and WAKE it of in the server. Put the process ID
in the global section, or in a logical name, or
use a sub-process instead of a detachted process
and use the parent ID.
Have fun,
Hein.
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