New PDF release: AIX 5L v5.2 Technical Reference: Kernel and Subsystems

This publication offers information regarding kernel providers, gadget driving force operations, dossier method operations, subroutines, the configuration subsystem, the communications subsystem, the low functionality terminal (LFT) subsystem, the logical quantity subsystem, the M-audio trap and playback adapter subsystem, the printer subsystem, the SCSI subsystem, and the serial DASD subsystem.This e-book is a part of the six-volume technical reference set, AIX 5L model 5.2 Technical Reference, that offers info on procedure calls, kernel extension calls, and subroutines within the following volumes: * AIX 5L model 5.2 Technical Reference: Base working procedure and Extensions quantity 1 and AIX 5L model 5.2 Technical Reference: Base working approach and Extensions quantity 2 offer info on procedure calls, subroutines, services, macros, and statements linked to base working approach runtime prone. * AIX 5L model 5.2 Technical Reference: Communications quantity 1 and AIX 5L model 5.2 Technical Reference: Communications quantity 2 supply details on access issues, capabilities, procedure calls, subroutines, and operations on the topic of communications companies. * AIX 5L model 5.2 Technical Reference: Kernel and Subsystems quantity 1 and AIX 5L model 5.2 Technical Reference: Kernel and Subsystems quantity 2 supply information regarding kernel companies, gadget driving force operations, dossier process operations, subroutines, the configuration subsystem, the communications subsystem, the low functionality terminal (LFT) subsystem, the logical quantity subsystem, the M-audio trap and playback adapter subsystem, the printer subsystem, the SCSI subsystem, and the serial DASD subsystem.

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If the return code is not RC_GOOD, the kernel does not place the queue element in a device queue. 38 Technical Reference: Kernel and Subsystems, Volume 1 Execution Environment The check routine executes under the process environment of the requester. Therefore, access to data areas must be handled as if the routine were in an interrupt handler environment. There is, however, no requirement to pin the code and data as in a normal interrupt handler environment. Return Values RC_GOOD Indicates successful completion.

Specifies the block to be read. Description The bread kernel service assigns a buffer to the given block. If the specified block is already in the buffer cache, then the block buffer header is returned. Otherwise, a free buffer is assigned to the specified block and the data is read into the buffer. The bread service waits for I/O to complete to return the buffer header. The buffer is allocated to the caller and marked as busy. Execution Environment The bread kernel service can be called from the process environment only.

V Return the buffer header. Otherwise, the getblk service is called to assign a free buffer to the specified block and to read the data into the buffer. The breada service waits for I/O to complete and then returns the buffer header. I/O is also started on the specified read-ahead block if the free list is not empty and the block is not already in the cache. However, the breada service does not wait for I/O to complete on this read-ahead block. 2 Kernel Extensions and Device Support Programming Concepts summarizes how the getblk, bread, breada, and brelse services uniquely manage the block I/O buffer cache.

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AIX 5L v5.2 Technical Reference: Kernel and Subsystems


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