add implementation of sys_sem_cancelablewait

- add nicer debug messages
- add current version of our pthread_library

hermit/kernel/syscall.c

@@ -359,7 +359,10 @@ int sys_sem_timedwait(sem_t *sem, unsigned int ms)
 
 int sys_sem_cancelablewait(sem_t* sem, unsigned int ms)
 {
-	return -ENOSYS;
+	if (BUILTIN_EXPECT(!sem, 0))
+		return -EINVAL;
+
+	return sem_wait(sem, ms);
 }
 
 int sys_clone(tid_t* id, void* ep, void* argv)

hermit/kernel/tasks.c

@@ -315,8 +315,6 @@ int clone_task(tid_t* id, entry_point_t ep, void* arg, uint8_t prio)
 	if ((core_id >= MAX_CORES) || !readyqueues[core_id].idle)
 		core_id = CORE_ID;
 
-	kprintf("start new thread on core %d with stack address %p\n", core_id, stack);
-
 	for(i=0; i<MAX_TASKS; i++) {
 		if (task_table[i].status == TASK_INVALID) {
 			task_table[i].id = i;
@@ -362,6 +360,10 @@ int clone_task(tid_t* id, entry_point_t ep, void* arg, uint8_t prio)
 	}
 
 	spinlock_irqsave_unlock(&table_lock);
+
+	if (!ret)
+		kprintf("start new thread %d on core %d with stack address %p\n", i, core_id, stack);
+
 out:
 	if (ret)
 		kfree(stack);

hermit/usr/pte

@@ -1 +1 @@
-Subproject commit 1cc811b60d8cb7362cffda973b95e450b24341f5
+Subproject commit 9dbfa59e382fd99164b2d80d620dab5decced3d0