Getting Started with QNX Neutrino - QNX Software Systems

© 2009, QNX Software Systems GmbH & Co. KG.
Message passing over a network 124
Networked message passing differences 126
Some notes on NDs 128
Priority inheritance 130
So what’s the trick? 132
Summary 133
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Clocks, Timers, and Getting a Kick Every So Often 135
Clocks and timers 137
Operating periodically 137
Clock interrupt sources 139
Base timing resolution 140
Timing jitter 140
Types of timers 141
Notification schemes 142
Using timers 146
Creating a timer 146
Signal, pulse, or thread? 147
What kind of timer? 147
A server with periodic pulses 149
Timers delivering signals 157
Timers creating threads 157
Getting and setting the realtime clock and more 157
Advanced topics 159
Other clock sources 159
Kernel timeouts 163
Summary 165
Interrupts 167
Neutrino and interrupts 169
Interrupt service routine 170
Level-sensitivity versus edge-sensitivity 172
Writing interrupt handlers 175
Attaching an interrupt handler 175
Now that you’ve attached an interrupt 176
Detaching an interrupt handler 177
The flags parameter 178
The interrupt service routine 178
ISR functions 186
Summary 188
April 30, 2009 Contents v