Article View: comp.os.msdos.programmer
Article #5523Info on Changing Stacks in protected mode
From: Steve Resnick
Date: Fri, 29 Mar 1991 15:58
Date: Fri, 29 Mar 1991 15:58
27 lines
1838 bytes
1838 bytes
I saw this article in C User's Journal about multi-threaded C using
setjmp/longjmp. This was something proposed to me a while ago, and thought
I'd try and work up my own code. After looking at the code I realized that
each thread is going to need a new stack. Assembler in hand, I write this
fairly generic assembler routine which launches the new thread with a new
stack. Everything works great until I run this under OS/2 rather than MS DOS.
OS/2 will not let me clear interrupts while changing SS:SP. My question:
Is it necessary to disable interrupts while switching stacks in protected
mode? If so, what is the appropriate meathod under OS/2? Is there a call
to prevent task switching/interrupt processing? Or, should it be implemented
as part of an IOPL segment?
Thanx for your support :)
Steve
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!uwm.edu!linac!att!pacbell.com!tandem!netcom!resnicksShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!uwm.edu!linac!att!pacbell.com!tandem!netcom!resnicks From: resnicks@netcom.COM (Steve Resnick) Newsgroups: comp.os.msdos.programmer,comp.os.os2.programmer Subject: Info on Changing Stacks in protected mode Summary: What gives? Message-ID: <1991Mar29.155840.2626@netcom.COM> Date: 29 Mar 91 15:58:40 GMT Sender: resnicks@netcom.COM (Steve Resnick) Organization: Me? Organized? You gotta be kidding! Lines: 27