error_t
hurd_thread_cancel (thread_t thread)
{
struct hurd_sigstate *ss = _hurd_thread_sigstate (thread);
struct machine_thread_all_state state;
int state_change;
error_t err;
if (! ss)
return EINVAL;
if (ss == _hurd_self_sigstate ())
{
/* We are cancelling ourselves, so it is easy to succeed
quickly. Since this function is not a cancellation point, we
just leave the flag set pending the next cancellation point
(hurd_check_cancel or RPC) and return success. */
ss->cancel = 1;
return 0;
}
assert (! __spin_lock_locked (&ss->critical_section_lock));
__spin_lock (&ss->critical_section_lock);
__spin_lock (&ss->lock);
err = __thread_suspend (thread);
__spin_unlock (&ss->lock);
if (! err)
{
/* Set the flag telling the thread its operation is being cancelled. */
ss->cancel = 1;
/* Interrupt any interruptible RPC now in progress. */
state.set = 0;
_hurdsig_abort_rpcs (ss, 0, 0, &state, &state_change, NULL, 0, 0);
if (state_change)
err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
(natural_t *) &state.basic,
MACHINE_THREAD_STATE_COUNT);
if (ss->cancel_hook)
/* The code being cancelled has a special wakeup function.
Calling this should make the thread wake up and check the
cancellation flag. */
(*ss->cancel_hook) ();
__thread_resume (thread);
}
_hurd_critical_section_unlock (ss);
return err;
}
static error_t
update_waiter (u_short *sample_buffer, size_t size, size_t offset, u_int scale)
{
error_t err;
if (profile_thread == MACH_PORT_NULL)
{
/* Set up the profiling collector thread. */
static void profile_waiter (void);
err = __thread_create (__mach_task_self (), &profile_thread);
if (! err)
err = __mach_setup_thread (__mach_task_self (), profile_thread,
&profile_waiter, NULL, NULL);
}
else
err = 0;
if (! err)
{
err = __task_enable_pc_sampling (__mach_task_self (), &profile_tick,
SAMPLED_PC_PERIODIC);
if (!err && sample_scale == 0)
/* Profiling was not turned on, so the collector thread was
suspended. Resume it. */
err = __thread_resume (profile_thread);
if (! err)
{
samples = sample_buffer;
maxsamples = size / sizeof *sample_buffer;
pc_offset = offset;
sample_scale = scale;
/* Calculate a good period for the collector thread. From TICK
and the kernel buffer size we get the length of time it takes
to fill the buffer; translate that to milliseconds for
mach_msg, and chop it in half for general lag factor. */
collector_timeout = MAX_PC_SAMPLES * profile_tick / 1000 / 2;
}
}
return err;
}
