Python threading is useless in the context of symmetric multiprocessor
(SMP) machines because the interpreter data structures are not thread-safe.
As a result, a global interpreter lock (GIL) ensures that one and only one
thread can run the interpreter at any time. As a result, it is impossible
to concurrently run Python functions on several processors. The BDL has made
it quite clear the situation will not change in the foreseeable future.
 
However multiprocessor machines are now mundane. Hence this module. For the
time being, only UNIX systems are supported, through the use of 'fork'.

Modules
		cPickle cStringIO libtbx.easy_pickle libtbx.forward_compatibility os select signal sys

Classes
		__builtin__.object logging child child_proxy parent parallelized_function   class child(logging)       Method resolution order: child logging __builtin__.object Methods defined here: __init__(self, func, read_fd, write_fd, debug) exit(self) handle_pipe_other_end_closing(self, signum, frame) log(self, msg, newline=True) loop(self) read(self, length) Data and other attributes defined here: input_closed = <class libtbx.symmetric_multi_processing.input_closed at 0x2588230> Data descriptors inherited from logging: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined)   class child_proxy(logging)       Method resolution order: child_proxy logging __builtin__.object Methods defined here: __eq__(self, other) __hash__(self) __init__(self, pid, read_fd, write_fd, debug) receive(self) send(self, x) Methods inherited from logging: log(self, msg, newline=True) Data descriptors inherited from logging: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined)   class logging(__builtin__.object)       Methods defined here: log(self, msg, newline=True) Data descriptors defined here: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined)   class parallelized_function(parent)       Method resolution order: parallelized_function parent logging __builtin__.object Methods defined here: __call__(self, iterable) __init__(self, func, n_workers, timeout=0.001, stdout=None, debug=False) Methods inherited from parent: each(self, iterable) poll(self, block) spawn(self, func) Methods inherited from logging: log(self, msg, newline=True) Data descriptors inherited from logging: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined)   class parent(logging)       Method resolution order: parent logging __builtin__.object Methods defined here: __init__(self, polling_timeout, stdout=None, debug=False) each(self, iterable) poll(self, block) spawn(self, func) Methods inherited from logging: log(self, msg, newline=True) Data descriptors inherited from logging: __dict__ dictionary for instance variables (if defined) __weakref__ list of weak references to the object (if defined)

Functions
		os_fork = fork(...) fork() -> pid   Fork a child process. Return 0 to child process and PID of child to parent process.

Data
		division = _Feature((2, 2, 0, 'alpha', 2), (3, 0, 0, 'alpha', 0), 8192) generators = _Feature((2, 2, 0, 'alpha', 1), (2, 3, 0, 'final', 0), 0) is_available = True