Python select Examples

Example #1

File: fork_reinit_test.py Project: olopez32/syncless

def RunWorker(sock_in, sock_out, max_size):
  #f_in = sock_in.makefile('r+')
  f_out = sock_out.makefile('r+')
  byte_count = 0
  line_count = 0
  min_size = max(max_size - 1000, 1)
  expected_line_count = max_size - min_size + 1
  expected_byte_count = (max_size + min_size) * (max_size - min_size + 1) / 2
  for i in xrange(min_size, max_size + 1):
    data = '*' * (i - 1) + '\n'
    f_out.write(data)
    f_out.flush()
    while sock_in and coio.select([sock_in], (), (), 0)[0]:
      data = sock_in.recv(8192)
      if data:
        byte_count += len(data)
        line_count += data.count('\n')
      else:
        sock_in = None
  sock_out.shutdown(1)  # Shut down for writing.
  if sock_in:  # Read the rest.
    while True:
      data = sock_in.recv(8192)
      if not data:
        break
      byte_count += len(data)
      line_count += data.count('\n')
  assert byte_count == expected_byte_count
  assert line_count == expected_line_count

Example #2

File: demo_select.py Project: olopez32/syncless

#! /usr/local/bin/stackless2.6
# by [email protected] at Mon Apr 19 02:02:18 CEST 2010
"""Demo code for select(2) with Syncless.

Please note that select(2) is inherently slow. Please see FAQ entry Q14 in
README.txt .
"""

import sys

from syncless import coio

if __name__ == '__main__':
    if len(sys.argv) <= 1 or sys.argv[1] == 'a':
        print >> sys.stderr, 'A'
        # Returns, immediately, retval[1] becomes [sys.stderr, sys.stdout] or
        # [sys.stdout, sys.stderr].
        print >> sys.stderr, coio.select([sys.stdin], [sys.stderr, sys.stdout],
                                         [], 3)
    elif len(sys.argv) > 1 and sys.argv[1] == 'b':
        print >> sys.stderr, 'B'
        # Times out after 3 seconds.
        print >> sys.stderr, coio.select([sys.stdin], [], [], 3)
    elif len(sys.argv) > 1 and sys.argv[1] == 'c':
        print >> sys.stderr, 'C'
        # Waits indefinitely.
        print >> sys.stderr, coio.select([sys.stdin], [], [], None)
    else:
        assert 0

Example #3

File: demo_select.py Project: olopez32/syncless

#! /usr/local/bin/stackless2.6
# by [email protected] at Mon Apr 19 02:02:18 CEST 2010

"""Demo code for select(2) with Syncless.

Please note that select(2) is inherently slow. Please see FAQ entry Q14 in
README.txt .
"""

import sys

from syncless import coio


if __name__ == "__main__":
    if len(sys.argv) <= 1 or sys.argv[1] == "a":
        print >>sys.stderr, "A"
        # Returns, immediately, retval[1] becomes [sys.stderr, sys.stdout] or
        # [sys.stdout, sys.stderr].
        print >>sys.stderr, coio.select([sys.stdin], [sys.stderr, sys.stdout], [], 3)
    elif len(sys.argv) > 1 and sys.argv[1] == "b":
        print >>sys.stderr, "B"
        # Times out after 3 seconds.
        print >>sys.stderr, coio.select([sys.stdin], [], [], 3)
    elif len(sys.argv) > 1 and sys.argv[1] == "c":
        print >>sys.stderr, "C"
        # Waits indefinitely.
        print >>sys.stderr, coio.select([sys.stdin], [], [], None)
    else:
        assert 0