Contents
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4.3Terminology and Concepts: APEX Versus vThreads ................................................35
4.4Managing APEX Partitions ............................................................................................35
4.4.1Allocating Partition Memory ...........................................................................35
4.4.2Initializing Partitions: Cold and Warm Starts ...............................................36
4.4.3Partition Attributes ...........................................................................................36
4.4.4Getting Partition Status ....................................................................................37
4.4.5Setting the Partition Mode ...............................................................................37
4.4.6Controlling Preemption in Partitions .............................................................38
4.4.7Setting New Partition Schedules .....................................................................39
4.5Managing APEX Processes ............................................................................................39
4.5.1Creating Processes .............................................................................................39
4.5.2Changing the Current Priority of Processes ..................................................40
4.5.3Increasing Deadline Times ...............................................................................40
4.5.4Getting the Current Status of Processes .........................................................41
4.5.5Getting Process IDs ...........................................................................................41
4.5.6Getting and Using vThreads Task Information ............................................41
4.5.7Types of Processes .............................................................................................41
4.5.8Scheduling Processes ........................................................................................42
4.5.9Process State Transitions ..................................................................................42
DORMANT State ..............................................................................................43
WAITING State ..................................................................................................43
RUNNING State ................................................................................................44
READY State ......................................................................................................45
4.5.10Suspending and Resuming Processes ............................................................45
4.5.11Stopping and Starting Processes .....................................................................46
4.5.12Controlling Preemption ....................................................................................46
4.6Managing Time in APEX Partitions .............................................................................47
4.6.1Scheduling Partitions ........................................................................................47
4.6.2System Clock Time ............................................................................................47
4.6.3Requesting Resources and Timeouts ..............................................................47
4.6.4Scheduling Processes ........................................................................................47
4.6.5Deadlines ............................................................................................................48
4.6.6Release Points ....................................................................................................50
4.7Communicating between Partitions ............................................................................50
4.7.1Limitations of APEX for Communicating between Partitions ...................51
4.7.2APEX Messages .................................................................................................51
4.7.3APEX Channels .................................................................................................52
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