static int exec_tramp(void *sig_stack)
{
init_new_thread_stack(sig_stack, NULL);
init_new_thread_signals();
os_stop_process(os_getpid());
return(0);
}
int fork_tramp(void *stack)
{
local_irq_disable();
arch_init_thread();
init_new_thread_stack(stack, finish_fork_handler);
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
return(0);
}
static int new_thread_proc(void *stack)
{
/* local_irq_disable is needed to block out signals until this thread is
* properly scheduled. Otherwise, the tracing thread will get mighty
* upset about any signals that arrive before that.
* This has the complication that it sets the saved signal mask in
* the sigcontext to block signals. This gets restored when this
* thread (or a descendant, since they get a copy of this sigcontext)
* returns to userspace.
* So, this is compensated for elsewhere.
* XXX There is still a small window until local_irq_disable() actually
* finishes where signals are possible - shouldn't be a problem in
* practice since SIGIO hasn't been forwarded here yet, and the
* local_irq_disable should finish before a SIGVTALRM has time to be
* delivered.
*/
local_irq_disable();
init_new_thread_stack(stack, new_thread_handler);
os_usr1_process(os_getpid());
change_sig(SIGUSR1, 1);
return(0);
}
void new_thread_proc(void *stack, void (*handler)(int sig))
{
init_new_thread_stack(stack, handler);
os_usr1_process(os_getpid());
}