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4.1.2 Module Overview
The MR100 kernel modules are outlined below.
• Scheduler
Forms a task processing queue based on task priority and controls operation so that the high-priority task at the
beginning in that queue (task with small priority value) is executed.
• Task Management Module
Exercises the management of various task states such as the RUNNING, READY, WAITING, and SUSPENDED
state.
• Task Synchronization Module
Accomplishes inter-task synchronization by changing the task status from a different task.
• Interrupt Management Module
Makes a return from the interrupt handler.
• Time Management Module
Sets up the system timer used by the MR100 kernel and starts the user-created alarm handler
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and cyclic han-
dler.
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.
• System Status Management Module
Gets the system status of MR100.
• System Configuration Management Module
Reports the MR100 kernel version number or other information.
• Synchronization and Communication Module
This is the function for synchronization and communication among the tasks. The following four functional mod-
ules are offered.
♦ Eventflag
Checks whether the flag controlled within the MR100 is set up and then determines whether or not to initi-
ate task execution. This results in accomplishing synchronization between tasks.
♦ Semaphore
Reads the semaphore counter value controlled within the MR100 and then determines whether or not to ini-
tiate task execution. This also results in accomplishing synchronization between tasks.
♦ Mailbox
Provides inter-task data communication by delivering the first data address.
♦ Data queue
Performs 32-bit data communication between tasks.
• Memory pool Management Module
Provides dynamic allocation or release of a memory area used by a task or a handler.
• Extended Function Module
Outside the scope of µITRON 4.0 Specification , this function performs reset processing on objects and short data
queue function.
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This handler actuates once only at preselected times.
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This handler periodically actuates.