src/cm/utils/thread.py
author Simon Descarpentries <sid@sopinspace.com>
Mon, 21 Oct 2013 16:37:07 +0200
changeset 553 bf26fb47a14c
parent 0 40c8f766c9b8
permissions -rw-r--r--
To allow scrolling in Safari mobile, we set the content of text_view_comments frame in a jQuery UI layout. So the automated scrolling operations in c_sync.js must be adjustable to the right part to scroll. Also, if a comment have to be shown outside of the current viewport, we scroll the correct part to that viewport and then set the comment top Y offset to juste what it needs to avoid the "Add comment" button after scrolling operation. If not in Safari mobile, we add an offset here to avoid comment to display under the "Add comment" button.

def synchronized(lock):
    """ Synchronization decorator. """
    
    def wrap(f):
        def newFunction(*args, **kw):
            lock.acquire()
            try:
                return f(*args, **kw)
            finally:
                lock.release()
        return newFunction
    return wrap

import sys, os

def daemonize(stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):

    # Perform first fork.
    try:
        pid = os.fork()
        if pid > 0:
            sys.exit(0) # Exit first parent.
    except OSError, e:
        sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror))
        sys.exit(1)

    # Decouple from parent environment.
    os.chdir("/")
    os.umask(0)
    os.setsid()

    # Perform second fork.
    try:
        pid = os.fork()
        if pid > 0:
            sys.exit(0) # Exit second parent.
    except OSError, e:
        sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror))
        sys.exit(1)

    # The process is now daemonized, redirect standard file descriptors.
    for f in sys.stdout, sys.stderr: f.flush()
    si = file(stdin, 'r')
    so = file(stdout, 'a+')
    se = file(stderr, 'a+', 0)
    os.dup2(si.fileno(), sys.stdin.fileno())
    os.dup2(so.fileno(), sys.stdout.fileno())
    os.dup2(se.fileno(), sys.stderr.fileno())