schmidt@indetech.com (Doug Schmidt) (07/01/90)
After a successful system call to
sem_id = semget (SEMKEY, 1, 0777 | IPC_CREAT);
is the result of
semctl (sem_id, 0, GETVAL, 0);
guaranteed to be 0? (assuming there are no errors, etc.). In otherwords,
what is the semval field of semaphores initialized to? TFM doesn't
seem to indicate this, and neither do Bach's or Rochkind's books.
thanks,
Doug
--
____*_ Douglas C. Schmidt schmidt@indetech.com
\ / / Independence Technologies {sun,sharkey,pacbell}!indetech!schmidt
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\/ Fremont, CA 94538 Voice: 415 438-2023walter@mecky.UUCP (Walter Mecky) (07/08/90)
In article <1990Jun30.221024.2060@indetech.com> schmidt@indetech.UUCP (Doug Schmidt) writes:
+ After a successful system call to
+
+ sem_id = semget (SEMKEY, 1, 0777 | IPC_CREAT);
+
+ is the result of
+
+ semctl (sem_id, 0, GETVAL, 0);
+
+ guaranteed to be 0? (assuming there are no errors, etc.). In otherwords,
+ what is the semval field of semaphores initialized to? TFM doesn't
+ seem to indicate this, and neither do Bach's or Rochkind's books.
My FM seems to indicate this (it's SCO UNIX):
The data structure associated with each semaphore in the set
is not initialized. The function semctl with the command
setval or setall can be used to initialize each semaphore.
--
Walter Mecky [ walter@mecky or ...uunet!unido!mecky!walter ]