CODEWITHSUNDEEP
pythonsubprocessbusy-waiting
void
void

Reputation: 108

how to avoid busy waiting between python unrelated processes

i have two python unrelated subprocces, and my wait method was something like the following

def wait(self):
    LIMIT = 3
    t0 = time.time()
    while 1:
        message = self.__read_message()

        if message != '\x00':
            break

        if time.time() - t0 > LIMIT:
            time.sleep(0.01)

    return message

the read message method is reading a message from a mmap shared memory then delete the message

    def __read_message(self):
    with self.__sem2:
        msg = self.mem[self.__PTR_READ:self.__PTR_READ + self.__MSG_LEN]
        self.mem[self.__PTR_READ:self.__PTR_READ + self.__MSG_LEN] = b"\x00" * self.__MSG_LEN
        self.mem.flush()

    return self.__message.unpack(msg)

can i improve it so that there is no busy waiting? i have used the subprocess module to create my other python process if this can help

Upvotes: 0

Views: 197

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