Keywords - M

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managers (system processes)

· System processes ·

similarity to user-written processes

· System processes vs. user-written processes ·

memory parity error, signal generated

· Summary of signals ·

memory references, signal generated upon detection of invalid reference

· Summary of signals ·

memory-image dump, generating when a process is terminated by a signal

· Termination ·

message passing

· IPC via messages · QNX as a message-passing operating system ·

advanced facilities

· Advanced facilities ·

buffer space already allocated for a message, using

· Reading or writing part of a message ·

conditional message reception

· Conditional message reception ·

messages

containing variable amounts of data

· Reading or writing part of a message ·

contents of

· IPC via messages · QNX as a message-passing operating system ·

defined

· IPC via messages ·

multipart

· Multipart messages ·

purpose of

· Interprocess communication ·

where data is stored

· Additional points to remember ·

network-wide

· An independent module · Introduction · Receiving the message on the remote node · Sending a message to a remote node · Virtual circuits ·

order in which messages are received

· Additional points to remember ·

primitives

· Conditional message reception · Message-passing primitives · Multipart messages ·

process synchronization

· Process synchronization ·

reading part of a message

· Reading or writing part of a message ·

remote messages

receiving

· Microkernel/Network Manager interface · Receiving the message on the remote node ·

sending

· Microkernel/Network Manager interface ·

reserved message codes

· Reserved message codes ·

signals and messages

· Signals and messages ·

synchronizing processes

· Process synchronization ·

writing part of a message

· Reading or writing part of a message ·

zero-length messages

· Additional points to remember ·

zero-length replies

· Additional points to remember ·

Microkernel

architecture

· QNX's microkernel architecture ·

entered as result of kernel calls

· A true kernel ·

general responsibilities

· A true kernel · Introduction ·

interface with Network Manager

· Microkernel/Network Manager interface ·

scheduling processes

· Process priorities · When scheduling decisions are made ·

modem, connected to a serial port

· Edited input mode ·

modification date (files)

· Date and time stamps ·

mounting filesystems

· Mounting a filesystem ·

See also block special files

moving the cursor

· Edited input mode ·

multi-sector writes

· Elevator seeking ·

multi-threading (Filesystem Manager)

· Multi-threading ·

multipart messages

· Multipart messages ·

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