Texas Instruments TMS320

Tasks
Thread Scheduling 4-45
Example 4-6. Creating a Task Object
Note:
Non-pointer type function arguments to LOG_printf need explicit type
casting to (Arg) as shown in the following code example:
LOG_printf(&trace, "Task %d Done", (Arg)id);
#define CONTEXTSIZE `size of additional context`
Void doCreate(task)
TSK_Handle task;
{
Ptr context;
context = MEM_alloc(0, CONTEXTSIZE, 0);
TSK_setenv(task, context); /* set task environment */
}
Void doDelete(task)
TSK_Handle task;
{
Ptr context;
context = TSK_getenv(task); /* get register buffer */
MEM_free(0, context, CONTEXTSIZE);
}
Void doSwitch(from, to)
TSK_Handle from;
TSK_Handle to;
{
Ptr context;
static Int first = TRUE;
if (first) {
first = FALSE;
return;
}
context = TSK_getenv(from); /* get register buffer */
*context = `hardware registers`; /* save registers */
context = TSK_getenv(to); /* get register buffer /
`hardware registers` = *context; /* restore registers */
}
Void doExit(Void)
{
TSK_Handle usrHandle;
/* get task handle, if needed */
usrHandle = TSK_self();
`perform user-defined exit steps`
}