196 lines
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196 lines
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<TITLE>Int 2A/AH=80h
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<META NAME="Description" CONTENT="
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Int 2A/AH=80h - NETWORK - BEGIN DOS CRITICAL SECTION -
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AH = 80h
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AL = critical section number (00h-0Fh) (see #02555)
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Notes: normally hooked to avoid interrupting a critical section, rather than
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called
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the handler should ensure that none of the critical sections are
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reentered, usually by suspending a task which attempts to reenter
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an active critical section
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the DOS kernel does not invoke critical sections 01h and 02h unless it
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is patched. DOS 3.1+ contains a zero-terminated list of words
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beginning at offset -11 from the Swappable Data Area
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<h2>Int 2A/AH=80h
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>NETWORK - BEGIN DOS CRITICAL SECTION</font></h3>
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<PRE>
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AH = 80h
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AL = critical section number (00h-0Fh) <a href="rb-4140.htm#Table2555" tppabs="http://www.ctyme.com/intr/rb-4140.htm#Table2555">(see #02555)</a>
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</PRE>
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<p><b>Notes:</b>
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Normally hooked to avoid interrupting a critical section, rather than
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called.
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The handler should ensure that none of the critical sections are
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reentered, usually by suspending a task which attempts to reenter
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an active critical section.
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The DOS kernel does not invoke critical sections 01h and 02h unless it
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is patched. DOS 3.1+ contains a zero-terminated list of words
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beginning at offset -11 from the Swappable Data Area
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<a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #01687 at INT 21/AX=5D06h); each word contains the offset within
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the DOS data segment of a byte which must be changed from C3h (RET)
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to 50h (PUSH AX) under DOS 3.x or from 00h to a nonzero value under
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DOS 4.0+ to enable use of critical sections. For DOS 4.0+, all
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words in this list point at the byte at offset 0D0Ch..
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MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into
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far calls to its own handler, and does not reflect the calls back
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to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or
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ModifyDOSInt2A=0 in the [386Enh] section.
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Novell NETX does not issue INT 2A/AH=80h and INT 2A/AH=81h calls when
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it intercepts INT 21 calls and processes them itself
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<p><b>See Also:</b>
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<a href="rb-4141.htm" tppabs="http://www.ctyme.com/intr/rb-4141.htm">AH=81h</a> - <a href="rb-4142.htm" tppabs="http://www.ctyme.com/intr/rb-4142.htm">AH=82h</a> - <a href="rb-4145.htm" tppabs="http://www.ctyme.com/intr/rb-4145.htm">AX=8700h</a> - <a href="rb-3023.htm" tppabs="http://www.ctyme.com/intr/rb-3023.htm">INT 21/AX=5D06h</a
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<PRE>
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<p>
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<a name=table2555></a>
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(Table 02555)
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Values for DOS critical section number:
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01h DOS kernel, SHARE.EXE, DOSMGR.
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Apparently for maintaining the integrity of DOS/SHARE/NET
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data structures
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02h DOS kernel, DOSMGR.
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Ensures that no multitasking occurs while DOS is calling an
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installable device driver
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05h network redirector
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06h DOS 4.x only IFSFUNC
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08h ASSIGN.COM
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0Ah MSCDEX, CORELCDX
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0Fh IBM PC LAN server (while intercepting INT 10/AH=06h,07h,0Eh)
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</PRE>
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<p>
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
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DOS Kernel</a>
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- <a href="int-2a-1.htm" tppabs="http://www.ctyme.com/intr/int-2A.htm">
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Int 2Ah</a>
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N</a>
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