blob: 2fed73f0551a4ae8b0e0bbf0297ec29a420bf3f1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
# Python modules
import time
import signal
# 3rd party modules
import posix_ipc
# Utils for this demo
import utils
MY_SIGNAL = signal.SIGUSR1
def handle_signal(signal_number, stack_frame):
message, priority = mq.receive()
print ("Ding! Message with priority %d received: %s" % (priority, message))
# Re-register for notifications
mq.request_notification(MY_SIGNAL)
# Create the message queue.
mq = posix_ipc.MessageQueue(utils.QUEUE_NAME, posix_ipc.O_CREX)
# Request notifications
mq.request_notification(MY_SIGNAL)
# Register my signal handler
signal.signal(MY_SIGNAL, handle_signal)
# Get user input and send it to the queue.
msg = "42"
while msg:
print ("\nEnter a message. A blank message will end the demo:")
msg = utils.get_input()
if msg:
mq.send(msg)
print ("Destroying the message queue.")
mq.close()
# I could call simply mq.unlink() here but in order to demonstrate
# unlinking at the module level I'll do it that way.
posix_ipc.unlink_message_queue(utils.QUEUE_NAME)
|
