Compatibility: DPMI 1.0+
Expects: AX    0d02H
SI:DI handle of shared memory block as obtained via INT 31H 0d00H
DX    option flags: bit 0: 0=suspend client until available
1=return with error when unavailable
bit 1: 0=exclusive serialization requested
1=shared serialization requested
2-15: reserved, must be 0
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
Info: This requests that access to a shared memory block be controlled
(serialized).  This provides a means for multiple clients to
access the block serially, avoiding simultaneous access.

DX When bit 1 of DX is set, this call requests exclusive
serialization, which effectively means "ownership for writing".
Shared serialization can be considered as a way to gain "read-
only access".

Notes:   Use INT 31H 0d03H to release ownership.

  A suspended client continues to receive interrupts and can use
INT 31H 0d03H in an interrupt handler to cancel the

See Also: DPMI API
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INT 31H 0d02H: Serialize on Shared Memory