Exploiting SMP-Specific Features

If your program or device driver will be using SMP-specific features of OS/2, such as the new DosListIO and DosPerfSysCall functions, you will need to dual-path your code so that your program can run on versions of OS/2 that do not support the new functions. It is the intent of IBM to provide these functions in non-SMP versions of OS/2 in the future.

The recommended way to determine from your program if you are running on an version of OS/2 that supports the new DosListIO and DosPerfSysCall

From a program:

Query the exported entry point for the function using DosQueryProcAddr.
From a device driver:
Use the GetDOSVar device helper specifying first an ordinal value of 18, SMP_ACTIVE. If SMP is indicated, ordinal value 17, _cProcessors can be used to determine the number of processors available.

In addition, ordinal 19, PSDInfo.psd_flags, returns usual informational about a PSD. Refer to PSDInfo in PSD.H for details.

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