OS/2 System Control Block Reference

This chapter contains details of some of the more important system control blocks used in debugging.

Where major differences in format exist between ALLSTRICT and RETAIL, and between versions of OS/2 then each version of the control block is given. Otherwise only OS/2 Warp V3.0 ALLSTRICT kernel versions of the control blocks are given and may be assumed to be applicable to also RETAIL and earlier versions of OS/2.

Warning:

The information given in this is for debugging purposes only. The layout of the control blocks may change from one release of OS/2 to the next. They are not to be considered a programming interface.

The following System Components are included in this chapter and an overview is provided in the next section: Overview of Kernel Components and Interfaces.

Miscellaneous System Control Blocks

This section describes system structures that are common to all components. These include: SAS and RMP.

Semaphore Management

This section describes the control blocks used for RamSem, FSRamSem Ksem, SysSem, PM/GRE, 32-bit, and MuxWait Semaphores.

Memory Management

VMAL, VMOB, VMAR, VMCO, VMAT, VMAH, VMKH, PAI, PGDATA, PF and VP.

Scheduler/Dispatcher

PTDA, TCB, TSD, ljmp, GISEG, LISEG, PIB, TIB, EXENT and Exception Handler structures.

System Loader

MTE, SMTE, OTE, STE

File System

SFT, MFT, FSC, RLR, VPB, DBP, CDS, BUF, Named and Anonymous Pipes.

I/O and Device Driver

This section describes the structures that relate to low level I/O. These include: Request Packets, BIOS Parameters Blocks and Device Driver Headers, Virtual Device Driver Entry Points.

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