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

   1 ### -*-pyrex-*-
   2 ###
   3 ### Timer selectors
   4 ###
   5 ### (c) 2005 Straylight/Edgeware
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the Python interface to mLib.
  11 ###
  12 ### mLib/Python is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### mLib/Python is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with mLib/Python; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 cdef double _tvtofloat(timeval *tv):
  27   return tv.tv_sec + (tv.tv_usec / 1000000)
  28 cdef void _floattotv(timeval *tv, double t):
  29   cdef double s, us
  30   us = modf(t, &s)
  31   tv.tv_sec = <int>s
  32   tv.tv_usec = <int>(us * 1000000)
  33
  34 cdef class SelTimer:
  35   """
  36   SelTimer(WHEN, [timerproc = None])
  37
  38   Arrange to perform some action at time WHEN.
  39   """
  40   cdef sel_timer t
  41   cdef int _activep
  42   cdef readonly double time
  43   cdef _timer
  44   def __cinit__(me, double when, timerproc = None, *hunoz, **hukairz):
  45     cdef timeval tv
  46     _floattotv(&tv, when)
  47     sel_addtimer(&_sel, &me.t, &tv, _timerfunc, <void *>me)
  48     me._activep = 1
  49     me.time = when
  50     me._timer = _checkcallable(timerproc, 'timer proc')
  51   def __dealloc__(me):
  52     if me._activep:
  53       sel_rmtimer(&me.t)
  54   property activep:
  55     """ST.activep -> BOOL: is the timer active?"""
  56     def __get__(me):
  57       return _tobool(me._activep)
  58   property timerproc:
  59     """ST.timerproc -> FUNC: call FUNC() when the timer pops"""
  60     def __get__(me):
  61       return me._timer
  62     def __set__(me, proc):
  63       me._timer = _checkcallable(proc, 'timer proc')
  64     def __del__(me):
  65       me._timer = None
  66   def kill(me):
  67     """ST.kill(): deactivate timer permanently"""
  68     if not me._activep:
  69       raise ValueError, 'already dead'
  70     sel_rmtimer(&me.t)
  71     me._dead()
  72     return me
  73   cdef _dead(me):
  74     me._activep = 0
  75     me.dead()
  76   def dead(me):
  77     """ST.dead(): called when timer is deactivated"""
  78     pass
  79   def timer(me, now):
  80     """ST.timer(NOW): called when the timer pops"""
  81     return _maybecall(me._timer, ())
  82
  83 cdef void _timerfunc(timeval *now, void *arg):
  84   cdef SelTimer st
  85   st = <SelTimer>arg
  86   st._dead()
  87   st.timer(_tvtofloat(now))
  88
  89 ###----- That's all, folks --------------------------------------------------