thread_suspend_check
thread_suspend_check(0);
thread_suspend_check(0);
thread_suspend_check(0);
thread_suspend_check(0);
thread_suspend_check(0);
ret = thread_suspend_check(1);
error = sleep ? thread_suspend_check(0) : ERESTART;
thread_suspend_check(0);
thread_suspend_check(0);
thread_suspend_check(0);
int thread_suspend_check(int how);