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# Copyright (c) 2005 Antoon Pardon
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from threading import Lock
from thread import get_ident
from types import BooleanType as UnConnected
UnRegistered, Registered = False, True
class EOInformation(Exception):
pass
class TubeAccess(Exception):
pass
class Fifo:
def __init__(self):
self.fifo = []
def put(self, item):
self.fifo.append(item)
def get(self):
return self.fifo.pop(0)
def size(self):
return len(self.fifo)
class Tube:
def __init__(self, maxsize, lck = Lock, container = None):
if container is None:
container = Fifo()
self.readers = set()
self.writers = set()
self.container = container
self.maxsize = maxsize
self.cb_arglst = []
self.cb_src = UnRegistered
self.in_use = Lock()
self.nowriter = lck()
self.full = lck()
self.empty = lck()
self.empty.acquire()
self.nowriter.acquire()
def open(self, access = 'r', *to):
thrd = get_ident()
access = access.lower()
self.in_use.acquire()
if 'w' in access:
if len(self.writers) == 0:
for _ in self.readers:
self.nowriter.release()
self.writers.add(thrd)
if 'r' in access:
self.readers.add(thrd)
if len(self.writers) == 0:
self.in_use.release()
self.nowriter.acquire(*to)
else:
self.in_use.release()
else:
self.in_use.release()
def close(self, access = 'rw'):
thrd = get_ident()
access = access.lower()
self.in_use.acquire()
if 'r' in access:
self.readers.discard(thrd)
if 'w' in access:
self.writers.discard(thrd)
## print "have", self.writers, "writers"
if len(self.writers) == 0:
if self.container.size() == 0:
## print "emptying container, as size is", self.container.size()
self.empty.release()
if self.cb_src is Registered and len(self.readers) > 0:
## print "adding callback"
self.cb_src = gob.idle_add(self._idle_callback)
## else:
## print "container size not empty, is", self.container.size()
for _ in self.readers:
## print "putting EOInformation"
self.container.put(EOInformation)
self.in_use.release()
def size(self):
self.in_use.acquire()
size = self.container.size()
self.in_use.release()
return size
def get(self, *to):
thrd = get_ident()
if thrd not in self.readers:
raise TubeAccess, "Thread has no read access for tube"
self.empty.acquire(*to)
self.in_use.acquire()
size = self.container.size()
if size == self.maxsize:
self.full.release()
item = self.container.get()
if size != 1:
self.empty.release()
elif type(self.cb_src) is not UnConnected:
gob.source_remove(self.cb_src)
self.cb_src = Registered
self.in_use.release()
if item is EOInformation:
raise EOInformation
else:
return item
def put(self, item, *to):
thrd = get_ident()
if thrd not in self.writers:
raise TubeAccess, "Thread has no write access for tube"
if thrd in self.readers:
self._put_rw(item)
else:
self._put_wo(item, *to)
def _put_wo(self, item, *to):
self.full.acquire(*to)
self.in_use.acquire()
size = self.container.size()
if size == 0:
self.empty.release()
if self.cb_src is Registered:
#gdk.threads_enter()
self.cb_src = gob.idle_add(self._idle_callback)
#gdk.threads_leave()
self.container.put(item)
if size + 1 < self.maxsize:
self.full.release()
self.in_use.release()
def _put_rw(self, item):
self.in_use.acquire()
size = self.container.size()
if size == 0:
self.empty.release()
if self.cb_src is Registered:
self.cb_src = gob.idle_add(self._idle_callback)
self.container.put(item)
self.in_use.release()
def _idle_callback(self):
self.in_use.acquire()
lst = self.cb_arglst.pop(0)
self.in_use.release()
func = lst[0]
lst[0] = self
ret_val = func(*lst)
self.in_use.acquire()
if ret_val:
lst[0] = func
self.cb_arglst.append(lst)
elif self.cb_arglst == []:
self.cb_src = UnRegistered
self.in_use.release()
return self.cb_src is not UnRegistered
def tube_add_watch(tube, callback, *args):
global gob #, gdk
import gobject as gob
#import gtk.gdk as gdk
tube.in_use.acquire()
tube.cb_arglst.append([callback] + list(args))
if tube.cb_src is UnRegistered:
if tube.container.size() == 0:
tube.cb_src = Registered
else:
tube.cb_src = gob.idle_add(tube._idle_callback)
tube.in_use.release()
def tube_remove_watch(tube):
## tube.in_use.acquire()
## gob.source_remove(tube.cb_src)
## tube._idle_callback.handler_block(tube.cb_src)
pass
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