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import threading
import extended_threading
import thread
from time import sleep
class reader(threading.Thread):
__lock = None
__mode = "w" #"w"ait, "g"rab, "r"elease, "e"xit
__SID = 0
__has = 0
__waiting = False
__this = None
ID = None
def __init__(self, lock):
threading.Thread.__init__(self)
self.__lock = lock
self.__mode = "w"
self.ID = self.__SID
type(self).__SID += 1
self.__has = 0
self.__waiting = False
#def __init__(self, lock):
def mode(self, m):
self.__mode = m
#def mode(self, m):
def run(self):
self.__this = thread.get_ident()
while(self.__mode != "e"):
while(self.__mode == "g"): #grab once per second
self.__waiting = True
wait = 1
if(self.__has):
wait = 0
if(self.__lock.acquire(self.__lock.READ, wait)):
print "Reader #" + str(self.ID) + " acquired"
self.__has += 1
self.__waiting = False
sleep(1)
#while(self.__mode == "g"): #grab once per second
while(self.__mode == "r" and self.__has > 0):
self.__lock.release()
self.__has -= 1
print "Reader #" + str(self.ID) + " released"
#while(self.__mode == "r" and self.__has > 0):
#while(self.__mode != "e"):
#def run(self):
def ident(self):
print "Reader #" + str(self.ID)
print " Thread: " + str(self.__this)
print " Waiting on lock?: " + str(self.__waiting)
print " Total locks: " + str(self.__has)
#def ident(self):
#class reader(threading.Thread):
class writer(threading.Thread):
__lock = None
__mode = "w" #"w"ait, "g"rab, "r"elease, "e"xit
__SID = 0
__has = 0
__waiting = False
__this = None
ID = None
def __init__(self, lock):
threading.Thread.__init__(self)
self.__lock = lock
self.__mode = "w"
self.ID = self.__SID
type(self).__SID += 1
self.__has = 0
self.__waiting = False
#def __init__(self, lock):
def mode(self, m):
self.__mode = m
#def mode(self, m):
def run(self):
self.__this = thread.get_ident()
while(self.__mode != "e"):
while(self.__mode == "g"): #grab once per second
self.__waiting = True
wait = 1
if(self.__has):
wait = 0
if(self.__lock.acquire(self.__lock.WRITE, wait)):
print "Writer #" + str(self.ID) + " acquired"
self.__has += 1
self.__waiting = False
sleep(1)
#while(self.__mode == "g"): #grab once per second
while(self.__mode == "r" and self.__has > 0):
self.__lock.release()
self.__has -= 1
print "Writer #" + str(self.ID) + " released"
#while(self.__mode == "r" and self.__has > 0):
#while(self.__mode != "e"):
#def run(self):
def ident(self):
print "Writer #" + str(self.ID)
print " Thread: " + str(self.__this)
print " Waiting on lock?: " + str(self.__waiting)
print " Total locks: " + str(self.__has)
#def ident(self):
#class writer(threading.Thread):
l = extended_threading.RWrlock()
threads = []
threads.append(reader(l))
threads.append(reader(l))
threads.append(reader(l))
threads.append(writer(l))
threads.append(writer(l))
threads.append(writer(l))
def grab():
for t in threads:
t.mode("g")
def wait():
for t in threads:
t.mode("w")
def release():
for t in threads:
t.mode("r")
def status():
for t in threads:
t.ident()
def stop():
for t in threads:
t.mode("e")
def start():
for t in threads:
t.start()
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