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"""
module pyabc_split

Executes python functions and their arguements as separate processes and returns their return values through pickling. This modules offers a single function:

Function: split_all(funcs)

The function returns a generator objects that allowes iteration over the results,

Arguments:

funcs: a list of tuples (f, args) where f is a python function and args is a collection of arguments for f.

Caveats:

1. Global variables in the parent process are not affected by the child processes.
2. The functions can only return simple types, see the pickle module for details

Usage:

Assume you would like to run the function f_1(1), f_2(1,2), f_3(1,2,3) in different processes. 

def f_1(i):
    return i+1
    
def f_2(i,j):
    return i*10+j+1
    
def f_3(i,j,k):
    return i*100+j*10+k+1

Construct a tuple of the function and arguments for each function

t_1 = (f_1, [1])
t_2 = (f_2, [1,2])
t_3 = (f_3, [1,2,3])

Create a list containing these tuples:

funcs = [t_1, t_2, t_3]

Use the function split_all() to run these functions in separate processes:

for res in split_all(funcs):
    print res
    
The output will be:

2
13
124

(The order may be different, except that in this case the processes are so fast that they terminate before the next one is created)

Alternatively, you may quite in the middle, say after the first process returns:

for res in split_all(funcs):
    print res
    break
    
This will kill all processes not yet finished.

To run ABC operations, that required saving the child process state and restoring it at the parent, use abc_split_all().

    import pyabc
    
    def abc_f(truth):
        import os
        print "pid=%d, abc_f(%s)"%(os.getpid(), truth)
        pyabc.run_command('read_truth %s'%truth)
        pyabc.run_command('strash')
        
    funcs = [
        defer(abc_f)("1000"),
        defer(abc_f)("0001")
    ]
    
    for _ in abc_split_all(funcs):
        pyabc.run_command('write_verilog /dev/stdout')

Author: Baruch Sterin <sterin@berkeley.edu>
"""

import os
import select
import fcntl
import errno
import sys
import cPickle as pickle
import signal
import cStringIO

from contextlib import contextmanager

import pyabc

def _retry_select(rlist):
    while True:
        try:
            rrdy,_,_ = select.select(rlist,[],[])
            if rrdy:
                return rrdy
        except select.error as e:
            if e[0] == errno.EINTR:
                continue
            raise

class _splitter(object):
    
    def __init__(self, funcs):
        self.funcs = funcs
        self.pids = []
        self.fds = {}
        self.buffers = {}
        self.results = {}
    
    def is_done(self):
        return len(self.fds) == 0
    
    def cleanup(self):
        # close pipes and kill child processes
        for pid,(i,fd) in self.fds.iteritems():
            os.close(fd)
            try:
                os.kill( pid, signal.SIGINT )
            except Exception as e:
                print >>sys.stderr, 'exception while trying to kill pid=%d: '%pid, e
                raise
        
            # wait for termination and update result
        for pid, _ in self.fds.iteritems():
            os.waitpid( pid, 0 )
            self.results[pid] = None
            
        self.fds = {}
        self.buffers = {}

    def child( self, fdw, f):
        # call function
        res = f()
        
        # write return value into pipe
        with os.fdopen( fdw, "w" ) as fout:
            pickle.dump(res, fout)
            
        return 0

    def fork_one(self, f):


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