static int semaphore1_do_test(struct vmm_chardev *cdev)
{
int rc, failures = 0;
/* Initialize semaphores */
INIT_SEMAPHORE(&s1, 1, 1);
INIT_SEMAPHORE(&s2, 1, 0);
/* s1 semaphore should be available */
if (!vmm_semaphore_avail(&s1)) {
failures++;
}
/* s2 semaphore should not be available */
if (vmm_semaphore_avail(&s2)) {
failures++;
}
/* Acquire s1 semaphore */
rc = vmm_semaphore_down(&s1);
if (rc) {
return rc;
}
/* Start workers */
vmm_threads_start(workers[0]);
/* Wait for worker0 block on s1 semaphore */
vmm_msleep(SLEEP_MSECS * 10);
/* s2 semaphore should not be available */
if (vmm_semaphore_avail(&s2)) {
failures++;
}
/* Release s1 semaphore */
rc = vmm_semaphore_up(&s1);
if (rc) {
return rc;
}
/* Wait for worker0 wakeup and release s2 semaphore */
vmm_msleep(SLEEP_MSECS * 10);
/* s2 semaphore should be available */
if (!vmm_semaphore_avail(&s2)) {
failures++;
}
/* Stop workers */
vmm_threads_stop(workers[0]);
return (failures) ? VMM_EFAIL : 0;
}
struct super *super_get(struct vfs_fstype *type, struct blkdev *blkdev)
{
struct super *sb;
sb = objcache_alloc0(supers);
if ( NULL == sb )
return NULL;
sb->s_type = type;
sb->s_dev = blkdev;
sb->s_inode_cache.rb_node = NULL;
INIT_SEMAPHORE(&sb->s_sem, 1);
if ( sb->s_type->read_super(sb) ) {
printk("vfs: error mounting root filesystem\n");
objcache_free2(supers, sb);
return NULL;
}
list_add(&sb->s_list, &superblocks);
return sb;
}
