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SCIOPTA - Real-Time Kernel

5-4 Manual Version 4.1 User’s Manual

SCIOPTA - Real-Time Kernel

5 Processes

For process scheduling SCIOPTA uses a combination of the module priority and process priority called effective

priority. The kernel determines the effective priority as follows:

Effective Priority = Module Priority + Process Priority

See also chapter 4.3 “Module Priority” on page 4-1.

5.6.3 Writing Prioritized Processes

5.6.3.1 Process Declaration Syntax

All prioritized processes in SCIOPTA must contain the following declaration:

SC_PROCESS (<proc_name>)

{

for (;;)

{

/* Code for process <proc_name> */

}

5.6.3.2 Process Template

#include <sciopta.h> /* SCIOPTA standard prototypes and definitions */

SC_PROCESS (proc_name) /* Declaration for prioritized process proc_name */

{

/* Local variables */

/* Process initialization code */

for (;;) /* “for-ever”-loop declaration. */

{ /* A SCIOPTA prioritized process may never return */

/* It is an error to terminate a prioritized process */

/* If a prioritized process terminates and returns */

/* the SCIOPTA kernel will produce an error condition */

/* and call the SCIOPTA error hook */

/* Code for process proc_name */

}

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