Interrupt 2Fh Function 4004h

mov ax, 4004h       ; Exit Critical Section
int 2fh

Exit Critical Section notifies the virtual-display device that a VM application has completed a critical section and can now respond to Save Video Register State (Interrupt 2Fh Function 4005h).

A VM application calls this function when it has completed critical section processing.

This function has no parameters.

• This function has no return value.

Calls to Exit Critical Section not preceded by a corresponding call to Enter Critical Section (Interrupt 2Fh Function 4003h) are ignored.

See also Interrupt 2Fh Function 4003h Enter Critical Section

See also Interrupt 2Fh Function 4005h Save Video Register State