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glibc  2.9
thread-cancel.c File Reference
#include <hurd/signal.h>
#include <hurd/interrupt.h>
#include <assert.h>
#include <thread_state.h>

Go to the source code of this file.


mach_port_t _hurdsig_abort_rpcs (struct hurd_sigstate *ss, int signo, int sigthread, struct machine_thread_all_state *, int *state_change, mach_port_t *reply_port, mach_msg_type_name_t reply_port_type, int untraced)
error_t hurd_thread_cancel (thread_t thread)
int hurd_check_cancel (void)

Function Documentation

mach_port_t _hurdsig_abort_rpcs ( struct hurd_sigstate ss,
int  signo,
int  sigthread,
struct machine_thread_all_state ,
int state_change,
mach_port_t *  reply_port,
mach_msg_type_name_t  reply_port_type,
int  untraced 
int hurd_check_cancel ( void  )

Definition at line 89 of file thread-cancel.c.

  struct hurd_sigstate *ss = _hurd_self_sigstate ();
  int cancel;

  __spin_lock (&ss->lock);
  assert (! __spin_lock_locked (&ss->critical_section_lock));
  cancel = ss->cancel;
  ss->cancel = 0;
  __spin_unlock (&ss->lock);

  return cancel;

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Definition at line 36 of file thread-cancel.c.

  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,

      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;

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