semget, semctl & semop

QNX Newsgroups (Archives) qdn.public.qnxrtp.porting
1

I am trying to port PostgreSQL which makes calls to semaphore
routines “semget, semop, and semctl”.

While these are not mentioned in documents at qdn, there is a
header file, “sem.h” which has external prototypes for them.
Are these for use? If so, which library? (A quick scan of *.a and
*.so did not come up with any mention of these routines.)

I am using the Windows based sdk for 6.0.
Sem.h is located at:
[drive]:\qnxsdk\qnx\neutrino\usr\nto\usr\include\sys\sem.h

PostgreSQL has some routines to implement these calls, but their
prototypes do not match those in “sem.h” – not sure which is right,
the PostgreSQL people have added a paramter based on an enum,
where QSSL (and others) deal with that via variable arguments.
extern int semctl(int semid, int semnum, int cmd, /* … / union semun
arg);
vs
int semctl(int semid, int semnum, int cmd, … / union semun arg */);

Any thoughts, pointers, (help), would be appreciated.

thank you

2

Ignore sem.h ans use whatever comes with Postgres. Those functions aren’t
implemented in QNX.

  • igor

“Aaron Tucker” <aaron.tucker@igt.com> wrote in message
news:9qnsnm$7br$1@inn.qnx.com…

I am trying to port PostgreSQL which makes calls to semaphore
routines “semget, semop, and semctl”.

While these are not mentioned in documents at qdn, there is a
header file, “sem.h” which has external prototypes for them.
Are these for use? If so, which library? (A quick scan of *.a and
*.so did not come up with any mention of these routines.)

I am using the Windows based sdk for 6.0.
Sem.h is located at:
[drive]:\qnxsdk\qnx\neutrino\usr\nto\usr\include\sys\sem.h

PostgreSQL has some routines to implement these calls, but their
prototypes do not match those in “sem.h” – not sure which is right,
the PostgreSQL people have added a paramter based on an enum,
where QSSL (and others) deal with that via variable arguments.
extern int semctl(int semid, int semnum, int cmd, /* … / union semun
arg);
vs
int semctl(int semid, int semnum, int cmd, … / union semun arg */);

Any thoughts, pointers, (help), would be appreciated.

thank you

3

Hi Aaron…

I would say that perhaps you would consider using rtp 6.1A, and then you
may want to explore what you’ll find here:

http://developers.qnx.com/Misc/

NOTE: I myself have not checked the contents of these yet, so I do not
know if they have any content useful for you.

Regards…

Miguel.


Aaron Tucker wrote:

I am trying to port PostgreSQL which makes calls to semaphore
routines “semget, semop, and semctl”.

While these are not mentioned in documents at qdn, there is a
header file, “sem.h” which has external prototypes for them.
Are these for use? If so, which library? (A quick scan of *.a and
*.so did not come up with any mention of these routines.)

I am using the Windows based sdk for 6.0.
Sem.h is located at:
[drive]:\qnxsdk\qnx\neutrino\usr\nto\usr\include\sys\sem.h

PostgreSQL has some routines to implement these calls, but their
prototypes do not match those in “sem.h” – not sure which is right,
the PostgreSQL people have added a paramter based on an enum,
where QSSL (and others) deal with that via variable arguments.
extern int semctl(int semid, int semnum, int cmd, /* … / union semun
arg);
vs
int semctl(int semid, int semnum, int cmd, … / union semun arg */);

Any thoughts, pointers, (help), would be appreciated.

thank you

–

my opinions are mine, only mine, solely mine, and they are not related
in any possible way to the institution(s) in which I study and work.

Miguel Simon
Research Engineer
School of Aerospace and Mechanical Engineering
University of Oklahoma
http://www.amerobotics.ou.edu/
http://www.saic.com