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glibc  2.9
Functions
preempt-sig.c File Reference
#include <hurd/sigpreempt.h>
#include <hurd/signal.h>
#include <assert.h>

Go to the source code of this file.

Functions

void hurd_preempt_signals (struct hurd_signal_preemptor *preemptor)
void hurd_unpreempt_signals (struct hurd_signal_preemptor *preemptor)

Function Documentation

void hurd_preempt_signals ( struct hurd_signal_preemptor preemptor)

Definition at line 24 of file preempt-sig.c.

{
  __mutex_lock (&_hurd_siglock);
  preemptor->next = _hurdsig_preemptors;
  _hurdsig_preemptors = preemptor;
  _hurdsig_preempted_set |= preemptor->signals;
  __mutex_unlock (&_hurd_siglock);
}

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void hurd_unpreempt_signals ( struct hurd_signal_preemptor preemptor)

Definition at line 34 of file preempt-sig.c.

{
  struct hurd_signal_preemptor **p;
  sigset_t preempted = 0;

  __mutex_lock (&_hurd_siglock);

  p = &_hurdsig_preemptors;
  while (*p)
    if (*p == preemptor)
      {
       /* Found it; take it off the chain.  */
       *p = (*p)->next;
       if ((preemptor->signals & preempted) != preemptor->signals)
         {
           /* This might have been the only preemptor for some
              of those signals, so we must collect the full mask
              from the others.  */
           struct hurd_signal_preemptor *pp;
           for (pp = *p; pp; pp = pp->next)
             preempted |= pp->signals;
           _hurdsig_preempted_set = preempted;
         }
       __mutex_unlock (&_hurd_siglock);
       return;
      }
    else
      {
       preempted |= (*p)->signals;
       p = &(*p)->next;
      }

  __mutex_unlock (&_hurd_siglock); /* Avoid deadlock during death rattle.  */
  assert (! "removing absent preemptor");
}

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