mdw@git.distorted.org.uk Git - mLib-python/blob - sig.pyx

   1 # -*-pyrex-*-
   2 #
   3 # $Id$
   4 #
   5 # In-band signals
   6 #
   7 # (c) 2005 Straylight/Edgeware
   8 #
   9
  10 #----- Licensing notice -----------------------------------------------------
  11 #
  12 # This file is part of the Python interface to mLib.
  13 #
  14 # mLib/Python is free software; you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation; either version 2 of the License, or
  17 # (at your option) any later version.
  18 #
  19 # mLib/Python is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23 #
  24 # You should have received a copy of the GNU General Public License
  25 # along with mLib/Python; if not, write to the Free Software Foundation,
  26 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27
  28 import signal
  29
  30 cdef class SelSignal:
  31   cdef sig s
  32   cdef int _activep
  33   cdef readonly int signal
  34   cdef _signalled
  35   def __new__(me, int sig, signalledproc = None, *hunoz, **hukairz):
  36     if sig < 0 or sig >= signal.NSIG:
  37       raise ValueError, 'signal number out of range'
  38     me.signal = sig
  39     me._signalledproc = _checkcallable(signalledproc, 'signalled proc')
  40     me._activep = 0
  41   def __dealloc__(me):
  42     if me._activep:
  43       sig_remove(&me.s)
  44   property activep:
  45     def __get__(me):
  46       return _tobool(me._activep)
  47   property signalledproc:
  48     def __get__(me):
  49       return me._signalled
  50     def __set__(me, proc):
  51       me._signalled = _checkcallable(proc, 'signalled proc')
  52     def __del__(me):
  53       me._signalled = None
  54   def enable(me):
  55     if me._activep:
  56       raise ValueError, 'already enabled'
  57     sig_add(&me.s, me.signal, _sigfunc, <void *>me)
  58     me._enabled()
  59     return me
  60   def disable(me):
  61     if not me._activep:
  62       raise ValueError, 'already disabled'
  63     sig_remove(&me.s)
  64     me._disabled()
  65     return me
  66   cdef _enabled(me):
  67     me._activep = 1
  68     me.enabled()
  69   cdef _disabled(me):
  70     me._activep = 0
  71     me.disabled()
  72   def enabled(me):
  73     pass
  74   def disabled(me):
  75     pass
  76   def signalled(me):
  77     return _maybecall(me._signalled, ())
  78
  79 cdef void _sigfunc2(void *arg):
  80   cdef SelSignal s
  81   s = <SelSignal>arg
  82   s.signalled()
  83 cdef void _sigfunc(int sig, void *arg):
  84   PyEval_AcquireLock()
  85   _sigfunc2(arg)
  86   PyEval_ReleaseLock()
  87
  88 sig_init(&_sel)
  89
  90 #----- That's all, folks ----------------------------------------------------