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AH = 81h AL = critical section number (00h-0Fh) (see #02555)
Notes: Normally hooked rather than called. The handler should reawaken any tasks which were suspended due to an attempt to enter the specified critical section. MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into far calls to its own handler, and does not reflect the calls back to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or ModifyDOSInt2A=0 in the [386Enh] section
See Also: AH=80h - AH=82h - AX=8700h
Category: DOS Kernel - Int 2Ah - N
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