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add an example for the usage of a semaphore

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This commit is contained in:
Stefan Lankes 2013-11-26 09:23:39 +01:00
parent de9207a6b2
commit ebf5172211
1 changed files with 6 additions and 0 deletions
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6
kernel/main.c
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@ -31,6 +31,7 @@
#include <eduos/tasks.h>
#include <eduos/processor.h>
#include <eduos/tasks.h>
#include <eduos/semaphore.h>
/*
* Note that linker symbols are not variables, they have no memory allocated for
@ -43,13 +44,17 @@ extern const void bss_end;
extern char __BUILD_DATE;
extern char __BUILD_TIME;
static sem_t sem;
static int foo(void* arg)
{
int i = 0;
for(i=0; i<5; i++) {
sem_wait(&sem);
kprintf("hello from %s\n", (char*) arg);
reschedule();
sem_post(&sem);
}
return 0;
@ -75,6 +80,7 @@ int main(void)
kprintf("This is eduOS %s Build %u, %u\n", EDUOS_VERSION, &__BUILD_DATE, &__BUILD_TIME);
kprintf("Kernel starts at %p and ends at %p\n", &kernel_start, &kernel_end);
sem_init(&sem, 1);
create_kernel_task(&id1, foo, "foo1", NORMAL_PRIO);
create_kernel_task(&id2, foo, "foo2", NORMAL_PRIO);
reschedule();