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-\section{\module{thread} ---
-         Multiple threads of control}
-
-\declaremodule{builtin}{thread}
-\modulesynopsis{Create multiple threads of control within one interpreter.}
-
-
-This module provides low-level primitives for working with multiple
-threads (a.k.a.\ \dfn{light-weight processes} or \dfn{tasks}) --- multiple
-threads of control sharing their global data space.  For
-synchronization, simple locks (a.k.a.\ \dfn{mutexes} or \dfn{binary
-semaphores}) are provided.
-\index{light-weight processes}
-\index{processes, light-weight}
-\index{binary semaphores}
-\index{semaphores, binary}
-
-The module is optional.  It is supported on Windows, Linux, SGI
-IRIX, Solaris 2.x, as well as on systems that have a \POSIX{} thread
-(a.k.a. ``pthread'') implementation.  For systems lacking the \module{thread}
-module, the \refmodule[dummythread]{dummy_thread} module is available.
-It duplicates this module's interface and can be
-used as a drop-in replacement.
-\index{pthreads}
-\indexii{threads}{\POSIX}
-
-It defines the following constant and functions:
-
-\begin{excdesc}{error}
-Raised on thread-specific errors.
-\end{excdesc}
-
-\begin{datadesc}{LockType}
-This is the type of lock objects.
-\end{datadesc}
-
-\begin{funcdesc}{start_new_thread}{function, args\optional{, kwargs}}
-Start a new thread and return its identifier.  The thread executes the function
-\var{function} with the argument list \var{args} (which must be a tuple).  The
-optional \var{kwargs} argument specifies a dictionary of keyword arguments.
-When the function returns, the thread silently exits.  When the function
-terminates with an unhandled exception, a stack trace is printed and
-then the thread exits (but other threads continue to run).
-\end{funcdesc}
-
-\begin{funcdesc}{interrupt_main}{}
-Raise a \exception{KeyboardInterrupt} exception in the main thread.  A subthread
-can use this function to interrupt the main thread.
-\versionadded{2.3}
-\end{funcdesc}
-
-\begin{funcdesc}{exit}{}
-Raise the \exception{SystemExit} exception.  When not caught, this
-will cause the thread to exit silently.
-\end{funcdesc}
-
-%\begin{funcdesc}{exit_prog}{status}
-%Exit all threads and report the value of the integer argument
-%\var{status} as the exit status of the entire program.
-%\strong{Caveat:} code in pending \keyword{finally} clauses, in this thread
-%or in other threads, is not executed.
-%\end{funcdesc}
-
-\begin{funcdesc}{allocate_lock}{}
-Return a new lock object.  Methods of locks are described below.  The
-lock is initially unlocked.
-\end{funcdesc}
-
-\begin{funcdesc}{get_ident}{}
-Return the `thread identifier' of the current thread.  This is a
-nonzero integer.  Its value has no direct meaning; it is intended as a
-magic cookie to be used e.g. to index a dictionary of thread-specific
-data.  Thread identifiers may be recycled when a thread exits and
-another thread is created.
-\end{funcdesc}
-
-\begin{funcdesc}{stack_size}{\optional{size}}
-Return the thread stack size used when creating new threads.  The
-optional \var{size} argument specifies the stack size to be used for
-subsequently created threads, and must be 0 (use platform or
-configured default) or a positive integer value of at least 32,768 (32kB).
-If changing the thread stack size is unsupported, a \exception{ThreadError}
-is raised.  If the specified stack size is invalid, a \exception{ValueError}
-is raised and the stack size is unmodified.  32kB is currently the minimum
-supported stack size value to guarantee sufficient stack space for the
-interpreter itself.  Note that some platforms may have particular
-restrictions on values for the stack size, such as requiring a minimum
-stack size > 32kB or requiring allocation in multiples of the system
-memory page size - platform documentation should be referred to for
-more information (4kB pages are common; using multiples of 4096 for
-the stack size is the suggested approach in the absence of more
-specific information).
-Availability: Windows, systems with \POSIX{} threads.
-\versionadded{2.5}
-\end{funcdesc}
-
-
-Lock objects have the following methods:
-
-\begin{methoddesc}[lock]{acquire}{\optional{waitflag}}
-Without the optional argument, this method acquires the lock
-unconditionally, if necessary waiting until it is released by another
-thread (only one thread at a time can acquire a lock --- that's their
-reason for existence).  If the integer
-\var{waitflag} argument is present, the action depends on its
-value: if it is zero, the lock is only acquired if it can be acquired
-immediately without waiting, while if it is nonzero, the lock is
-acquired unconditionally as before.  The
-return value is \code{True} if the lock is acquired successfully,
-\code{False} if not.
-\end{methoddesc}
-
-\begin{methoddesc}[lock]{release}{}
-Releases the lock.  The lock must have been acquired earlier, but not
-necessarily by the same thread.
-\end{methoddesc}
-
-\begin{methoddesc}[lock]{locked}{}
-Return the status of the lock:\ \code{True} if it has been acquired by
-some thread, \code{False} if not.
-\end{methoddesc}
-
-In addition to these methods, lock objects can also be used via the
-\keyword{with} statement, e.g.:
-
-\begin{verbatim}
-from __future__ import with_statement
-import thread
-
-a_lock = thread.allocate_lock()
-
-with a_lock:
-    print "a_lock is locked while this executes"
-\end{verbatim}
-
-\strong{Caveats:}
-
-\begin{itemize}
-\item
-Threads interact strangely with interrupts: the
-\exception{KeyboardInterrupt} exception will be received by an
-arbitrary thread.  (When the \refmodule{signal}\refbimodindex{signal}
-module is available, interrupts always go to the main thread.)
-
-\item
-Calling \function{sys.exit()} or raising the \exception{SystemExit}
-exception is equivalent to calling \function{exit()}.
-
-\item
-Not all built-in functions that may block waiting for I/O allow other
-threads to run.  (The most popular ones (\function{time.sleep()},
-\method{\var{file}.read()}, \function{select.select()}) work as
-expected.)
-
-\item
-It is not possible to interrupt the \method{acquire()} method on a lock
---- the \exception{KeyboardInterrupt} exception will happen after the
-lock has been acquired.
-
-\item
-When the main thread exits, it is system defined whether the other
-threads survive.  On SGI IRIX using the native thread implementation,
-they survive.  On most other systems, they are killed without
-executing \keyword{try} ... \keyword{finally} clauses or executing
-object destructors.
-\indexii{threads}{IRIX}
-
-\item
-When the main thread exits, it does not do any of its usual cleanup
-(except that \keyword{try} ... \keyword{finally} clauses are honored),
-and the standard I/O files are not flushed.
-
-\end{itemize}