void firsttask(void *arg) {
POSTASK_t t;
UVAR_t i;
posAtomicSet(&counter, 0);
/* creating the flag */
flagset = posFlagCreate();
if (flagset == NULL)
{
nosPrint("Failed to create a set of flags!\n");
return;
}
/* creating semaphore object with set one default value */
semaphore = posSemaCreate(1);
if (semaphore == NULL){
nosPrint("Failed to create a semaphore!\n");
return;
}
t = nosTaskCreate(task2, /* ptr to function: task2 that is executed */
NULL, /* optional argument, not used here */
1, /* priority of the first task */
0, /* stack size for the first task, 0 = default */
"task2"); /* task name */
if (t == NULL) {
nosPrint("Failed to start second task!\n");
}
t = nosTaskCreate(task3, /* ptr to function: task3 that is executed */
NULL, /* optional argument, not used here */
1, /* priority of the first task */
0, /* stack size for the first task, 0 = default */
"task3"); /* task name */
if (t == NULL) {
nosPrint("Failed to start third task!\n");
}
/* first flag status change */
posFlagSet(flagset, 1);
/* task1 handled */
task1(arg);
}
/* This is the first function that is called in the multitasking context.
* (See file ex_init4.c for how to setup pico]OS).
*/
void firsttask(void *arg)
{
POSTASK_t t;
posAtomicSet(&counter, 0);
/* Create a semaphore, initialize to 2.
* You may vary the initialization count between
* 1 and 3 and observe the output of this program.
*
* The initialization semaphore count limits the number
* of tasks that are allowed to access a shared resource
* at the same time.
*/
semaphore = posSemaCreate(2);
if (semaphore == NULL)
{
nosPrint("Failed to create a semaphore!\n");
return;
}
/* start a second task */
t = nosTaskCreate(task2, /* pointer to new task-function */
NULL, /* optional argument for the task-function */
2, /* priority level of the new task */
0, /* stack size (0 = default size) */
"task2"); /* optional name of the second task */
if (t == NULL)
{
nosPrint("Failed to start second task!\n");
}
/* start a second task */
t = nosTaskCreate(task3, /* pointer to new task-function */
NULL, /* optional argument for the task-function */
3, /* priority level of the new task */
0, /* stack size (0 = default size) */
"task3"); /* optional name of the third task */
if (t == NULL)
{
nosPrint("Failed to start third task!\n");
}
/* continue execution in function task1 */
task1(arg);
}
