CreateThread using malloc

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3 total messages Started by Fan Jiao Wed, 15 Apr 1992 19:19

#717

Author: Fan Jiao
Date: Wed, 15 Apr 1992 19:19

14 lines
901 bytes

I was using CreateThread call to create several threads.  Before that I was
using 'malloc' to create the stack which is needed as one of the parameters
for 'CreateThread' call.  

I donot know if use of 'malloc' is proper.  I also looked into the 
use of 'DosAllocSeg'.  And I got "wrong ring level" error msg while using
'DosAllocSeg'.

In short, I am confused in how to create the stack for theads. Any ideas?

Thanks much in advance.
-- 

Fan Jiao

Re: CreateThread using malloc

#729

Author: David Charlap
Date: Thu, 16 Apr 1992 13:24

26 lines
1614 bytes

In article <jj91eqk@twilight.wpd.sgi.com> fanj@remb6489.wpd writes:
>I was using CreateThread call to create several threads.  Before that I was
>using 'malloc' to create the stack which is needed as one of the parameters
>for 'CreateThread' call.  
>
>I donot know if use of 'malloc' is proper.  I also looked into the 
>use of 'DosAllocSeg'.  And I got "wrong ring level" error msg while using
>'DosAllocSeg'.
>
>In short, I am confused in how to create the stack for theads. Any ideas?

Can't help you there.  malloc() should be fine.  It maps onto a
subroutine based on DosAllocSeg.

About your "Wrong Ring Level", did you remember to run the macro to
convert the memory HANDLE returned to the memory POINTER you probably
need? (which malloc() returns)  I don't know the name of the macro,
but it's been posted a few times.

-- 
David Charlap                   Q:"Where do these stairs go?"
dic5340@hertz.njit.edu          A:"They go up"
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Re: CreateThread using malloc

#733

Author: Larry Salomon, Jr.
Date: Thu, 16 Apr 1992 21:54

27 lines
1858 bytes

In <jj91eqk@twilight.wpd.sgi.com>, fanj@remb6489.wpd.sgi.com (Fan Jiao) writes:
>
>I was using CreateThread call to create several threads.  Before that I was
>using 'malloc' to create the stack which is needed as one of the parameters
>for 'CreateThread' call.

I assume you mean DosCreateThread.

>I donot know if use of 'malloc' is proper.  I also looked into the
>use of 'DosAllocSeg'.  And I got "wrong ring level" error msg while using
>'DosAllocSeg'.

If you are writing a 16-bit application, DosAllocSeg should work.  Are
you passing it the proper parameters?  If you are writing a 32-bit
application, DosCreateThread will create the stack for you, so you don't
need to do it.

Cheers,
Larry Salomon, Jr. (aka 'Q')            LARRYS@YKTVMV.BITNET
OS/2 Applications and Tools             larrys@watson.ibm.com
IBM T.J. Watson Research Center         larrys@ibmman.watson.ibm.com
Yorktown Heights, NY                    larrys@ibmman2.watson.ibm.com

Disclaimer:  The statements and/or opinions stated above are strictly my
own and do not reflect the views of my employer.  Additionally, I have a
reputation for being obnoxious, so don't take any personal attacks too
seriously.

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