GIF89a=( �' 7IAXKgNgYvYx\%wh&h}t�h%�s%x�}9�R��&�0%� (�.��5�SD��&�a)�x5��;ͣ*ȡ&ղ)ׯ7׵<ѻ4�3�H֧KͯT��Y�aq��q��F� !� ' !� NETSCAPE2.0 , =( ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g���E�������R���E����B�� ��ȸ��D���"�Ů� �H��L��D٫D�B�����D���T���H �G��A R�ڐ |�� ٭&��E8�S�kG�A�px�a��� R2XB��E8I���6X�:vT)�~��q�賥��"F~%x� � 4#Z�0O|-4Bs�X:= Q� Sal��yXJ`GȦ|s h��K3l7�B|�$'7Jީܪ0!��D�n=�P� ����0`�R�lj����v>���5 �.69�ϸd�����nlv�9��f{���Pbx �l5}�p� ��� �3a���I�O����!ܾ���i��9��#��)p�a ޽ �{�)vm��%D~ 6f��s}Œ�D�W E�`!� �&L8x� �ܝ{)x`X/>�}m��R�*|`D�=�_ ^�5 !_&'a�O�7�c��`DCx`�¥�9�Y�F���`?��"� �n@`�} lď��@4>�d S �v�xN��"@~d��=�g�s~G��� ���ud &p8Q�)ƫlXD����A~H�ySun�j���k*D�LH�] ��C"J��Xb~ʪwSt}6K,��q�S:9ت:���l�@�`�� �.۬�t9�S�[:��=`9N����{¿�A !R�:���6��x�0�_ �;������^���#����!����U���;0L1�����p% A��U̬ݵ��%�S��!���~`�G���� ���=4�np�3���������u�u�ٮ|%2�I��r�#0��J``8�@S@5� ���^`8E�]�.�S���7 � �0�j S�D� z���i�S�����!���l��w9*�D�I�nEX��� &A�Go�Qf��F��;���}�J����F5��Q|���X��T��y���]� o ��C=��:���PB@ D׽S�(>�C�x}`��xJЬ�۠��p+eE0`�}`A �/NE�� �9@��� H�7�!%B0`�l*��!8 2�%� �:�1�0E��ux%nP1�!�C)�P81l�ɸF#Ƭ{����B0>�� �b�`��O3��()yRpb��E.ZD8�H@% �Rx+%���c� ���f��b�d�`F�"8�XH"��-�|1�6iI, 2�$+](A*j� QT�o0.�U�`�R�}`�SN����yae�����b��o~ S)�y�@��3 �tT�0�&�+~L�f"�-|�~��>!�v��~�\Q1)}@�}h#aP72�"�$ !� " , =( &7IAXG]KgNgYvYxR"k\%w]'}h}t�h%�g+�s%r.m3ax3�x�}9��&��+�!7�0%� (�.�SD��&��;�"&ײ)׻4��6�K� �@pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E �� �������E �´��C���ǶR��D��"Ʒ�ʱH��M��GڬD�B����D��T����G���C�C� l&�~:'�tU�6ɹ#��)�'�.6�&��Ȼ K(8p0N�?!�2"��NIJX>R��OM '��2�*x�>#n� �@<[:�I�f ��T���Cdb��[�}E�5MBo��@�`@��tW-3 �x�B���jI�&E�9[T&$��ﯧ&"s��ȳ����dc�UUρ#���ldj?����`\}���u|3'�R]�6 �S#�!�FKL�*N E���`$�:e�YD�q�.�촁�s \-�jA 9�����-��M[�x(�s��x�|���p��}k�T�DpE@W� ��]k`1� ���Yb ��0l��*n0��"~zBd�~u�7�0Bl��0-�x~|U�U0 �h�*HS�|��e"#"?vp�i`e6^�+q��`m8 #V�� ��VS|`��"m"сSn|@:U���~`pb�G�ED����2F�I�? >�x� R� ��%~jx��<�a�9ij�2�D��&: Z`�]w���:�6��B�7eFJ|�ҧ�,���FǮcS�ʶ+B�,�ܺN���>PAD�HD��~���n��}�#�� Q��S���2�X�{�k�lQ�2�����w�|2� h9��G�,m���3��6-��E�L��I�³*K���q�`DwV�QXS��peS��� qܧTS����R�u �<�a�*At�lmE� � ��N[P1�ۦ��$��@`��Dpy�yXvCAy�B`}D� 0QwG#� �a[^�� $���Ǧ{L�"[��K�g�;�S~��GX.�goT.��ư��x���?1z��x~:�g�|�L� ��S`��0S]P�^p F<""�?!,�!N4&P� ����:T�@h�9%t��:�-~�I<`�9p I&.)^ 40D#p@�j4�ج:�01��rܼF2oW�#Z ;$Q q  �K��Nl#29 !F@�Bh�ᏬL!XF�LHKh�.�hE&J�G��<"WN!�����Y@� >R~19J"�2,/ &.GXB%�R�9B6�W]���W�I�$��9�RE8Y� ��"�A5�Q.axB�&ة�J�! �t)K%tS-�JF b�NMxL��)�R��"���6O!TH�H� 0 !� ) , =( &AXKgNgYvYxR"k\%wh&h}h%�g+�s%r.x3�x�}9��&��+�R,�!7�0%� (�.��5��&�a)��;�"&ף*Ȳ)ׯ7׻4�3��6�H֧KͻH�T��Y��q��h� ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E$����� � ����$E$��"��D� � ������R��C��� E ��H�M��G�D� �B��ϾD��a��`1r��Ӑ�� �o~�zU!L�C'�yW�UGt����ll�0���uG�)A�s[��x� �xO%��X2�  P�n:R/��aHae+�Dm?# ǣ6�8�J�x�Di�M���j���5oQ7�- <! *�l��R2r/a!l)d� A"�E���� &� ;��c �%����b��pe~C"B���H�eF2��`8qb�t_`ur`e� w�u3��Pv�h""�`�Íx�LĹ��3� �~ֺ�:���MDfJ� �۵�W�%�S�X �؁)�@��:E��w�u�Sxb8y\m�zS��Zb�E�L��w!y(>�"w�=�|��s�d �C�W)H�cC$�L �7r.�\{)@�`@ �X�$PD `aaG:���O�72E�amn]�"Rc�x�R� &dR8`g��i�xLR!�P &d����T���i�|�_ � Qi�#�`g:��:noM� :V �)p����W&a=�e�k� j���1߲s�x�W�jal|0��B0�, \j۴:6���C ��W��|��9���zĸV {�;��n��V�m�I��.��PN� ����C��+��By�ѾHŸ:��� 7�Y�FTk�SaoaY$D�S���29R�kt� ��f� ��:��Sp�3�I��DZ� �9���g��u�*3)O��[_hv ,���Et x�BH� �[��64M@�S�M7d�l�ܶ5-��U܍��z�R3Ԭ3~ ��P��5�g: ���kN�&0�j4���#{��3S�2�K�'ợl���2K{� {۶?~m𸧠�I�nE�='����^���_�=��~�#O���'���o..�Y�n��CSO��a��K��o,���b�����{�C�� "�{�K ��w��Ozdը�:$ ���v�] A#� ���a�z)Rx׿ƥ�d``�w-�y�f�K!����|��P��=�`�(f��'Pa ��BJa%��f�%`�}F����6>��`G"�}�=�!o`�^FP�ةQ�C���`(�}\�ݮ ��$<��n@dĠE#��U�I�!� #l��9`k���'Rr��Z�NB�MF �[�+9���-�wj���8�r� ,V�h"�|�S=�G_��"E� 0i*%̲��da0mVk�):;&6p>�jK ��# �D�:�c?:R Ӭf��I-�"�<�="��7�3S��c2RW ,�8(T"P0F¡Jh�" ; 403WebShell
403Webshell
Server IP : 173.249.157.85  /  Your IP : 3.142.200.134
Web Server : Apache
System : Linux server.frogzhost.com 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64
User : econtech ( 1005)
PHP Version : 7.3.33
Disable Function : NONE
MySQL : OFF  |  cURL : OFF  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : ON  |  Pkexec : ON
Directory :  /usr/lib64/python2.7/Demo/threads/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :

[ Back ]     

Current File : /usr/lib64/python2.7/Demo/threads/sync.py
# Defines classes that provide synchronization objects.  Note that use of
# this module requires that your Python support threads.
#
#    condition(lock=None)       # a POSIX-like condition-variable object
#    barrier(n)                 # an n-thread barrier
#    event()                    # an event object
#    semaphore(n=1)             # a semaphore object, with initial count n
#    mrsw()                     # a multiple-reader single-writer lock
#
# CONDITIONS
#
# A condition object is created via
#   import this_module
#   your_condition_object = this_module.condition(lock=None)
#
# As explained below, a condition object has a lock associated with it,
# used in the protocol to protect condition data.  You can specify a
# lock to use in the constructor, else the constructor will allocate
# an anonymous lock for you.  Specifying a lock explicitly can be useful
# when more than one condition keys off the same set of shared data.
#
# Methods:
#   .acquire()
#      acquire the lock associated with the condition
#   .release()
#      release the lock associated with the condition
#   .wait()
#      block the thread until such time as some other thread does a
#      .signal or .broadcast on the same condition, and release the
#      lock associated with the condition.  The lock associated with
#      the condition MUST be in the acquired state at the time
#      .wait is invoked.
#   .signal()
#      wake up exactly one thread (if any) that previously did a .wait
#      on the condition; that thread will awaken with the lock associated
#      with the condition in the acquired state.  If no threads are
#      .wait'ing, this is a nop.  If more than one thread is .wait'ing on
#      the condition, any of them may be awakened.
#   .broadcast()
#      wake up all threads (if any) that are .wait'ing on the condition;
#      the threads are woken up serially, each with the lock in the
#      acquired state, so should .release() as soon as possible.  If no
#      threads are .wait'ing, this is a nop.
#
#      Note that if a thread does a .wait *while* a signal/broadcast is
#      in progress, it's guaranteeed to block until a subsequent
#      signal/broadcast.
#
#      Secret feature:  `broadcast' actually takes an integer argument,
#      and will wake up exactly that many waiting threads (or the total
#      number waiting, if that's less).  Use of this is dubious, though,
#      and probably won't be supported if this form of condition is
#      reimplemented in C.
#
# DIFFERENCES FROM POSIX
#
# + A separate mutex is not needed to guard condition data.  Instead, a
#   condition object can (must) be .acquire'ed and .release'ed directly.
#   This eliminates a common error in using POSIX conditions.
#
# + Because of implementation difficulties, a POSIX `signal' wakes up
#   _at least_ one .wait'ing thread.  Race conditions make it difficult
#   to stop that.  This implementation guarantees to wake up only one,
#   but you probably shouldn't rely on that.
#
# PROTOCOL
#
# Condition objects are used to block threads until "some condition" is
# true.  E.g., a thread may wish to wait until a producer pumps out data
# for it to consume, or a server may wish to wait until someone requests
# its services, or perhaps a whole bunch of threads want to wait until a
# preceding pass over the data is complete.  Early models for conditions
# relied on some other thread figuring out when a blocked thread's
# condition was true, and made the other thread responsible both for
# waking up the blocked thread and guaranteeing that it woke up with all
# data in a correct state.  This proved to be very delicate in practice,
# and gave conditions a bad name in some circles.
#
# The POSIX model addresses these problems by making a thread responsible
# for ensuring that its own state is correct when it wakes, and relies
# on a rigid protocol to make this easy; so long as you stick to the
# protocol, POSIX conditions are easy to "get right":
#
#  A) The thread that's waiting for some arbitrarily-complex condition
#     (ACC) to become true does:
#
#     condition.acquire()
#     while not (code to evaluate the ACC):
#           condition.wait()
#           # That blocks the thread, *and* releases the lock.  When a
#           # condition.signal() happens, it will wake up some thread that
#           # did a .wait, *and* acquire the lock again before .wait
#           # returns.
#           #
#           # Because the lock is acquired at this point, the state used
#           # in evaluating the ACC is frozen, so it's safe to go back &
#           # reevaluate the ACC.
#
#     # At this point, ACC is true, and the thread has the condition
#     # locked.
#     # So code here can safely muck with the shared state that
#     # went into evaluating the ACC -- if it wants to.
#     # When done mucking with the shared state, do
#     condition.release()
#
#  B) Threads that are mucking with shared state that may affect the
#     ACC do:
#
#     condition.acquire()
#     # muck with shared state
#     condition.release()
#     if it's possible that ACC is true now:
#         condition.signal() # or .broadcast()
#
#     Note:  You may prefer to put the "if" clause before the release().
#     That's fine, but do note that anyone waiting on the signal will
#     stay blocked until the release() is done (since acquiring the
#     condition is part of what .wait() does before it returns).
#
# TRICK OF THE TRADE
#
# With simpler forms of conditions, it can be impossible to know when
# a thread that's supposed to do a .wait has actually done it.  But
# because this form of condition releases a lock as _part_ of doing a
# wait, the state of that lock can be used to guarantee it.
#
# E.g., suppose thread A spawns thread B and later wants to wait for B to
# complete:
#
# In A:                             In B:
#
# B_done = condition()              ... do work ...
# B_done.acquire()                  B_done.acquire(); B_done.release()
# spawn B                           B_done.signal()
# ... some time later ...           ... and B exits ...
# B_done.wait()
#
# Because B_done was in the acquire'd state at the time B was spawned,
# B's attempt to acquire B_done can't succeed until A has done its
# B_done.wait() (which releases B_done).  So B's B_done.signal() is
# guaranteed to be seen by the .wait().  Without the lock trick, B
# may signal before A .waits, and then A would wait forever.
#
# BARRIERS
#
# A barrier object is created via
#   import this_module
#   your_barrier = this_module.barrier(num_threads)
#
# Methods:
#   .enter()
#      the thread blocks until num_threads threads in all have done
#      .enter().  Then the num_threads threads that .enter'ed resume,
#      and the barrier resets to capture the next num_threads threads
#      that .enter it.
#
# EVENTS
#
# An event object is created via
#   import this_module
#   your_event = this_module.event()
#
# An event has two states, `posted' and `cleared'.  An event is
# created in the cleared state.
#
# Methods:
#
#   .post()
#      Put the event in the posted state, and resume all threads
#      .wait'ing on the event (if any).
#
#   .clear()
#      Put the event in the cleared state.
#
#   .is_posted()
#      Returns 0 if the event is in the cleared state, or 1 if the event
#      is in the posted state.
#
#   .wait()
#      If the event is in the posted state, returns immediately.
#      If the event is in the cleared state, blocks the calling thread
#      until the event is .post'ed by another thread.
#
# Note that an event, once posted, remains posted until explicitly
# cleared.  Relative to conditions, this is both the strength & weakness
# of events.  It's a strength because the .post'ing thread doesn't have to
# worry about whether the threads it's trying to communicate with have
# already done a .wait (a condition .signal is seen only by threads that
# do a .wait _prior_ to the .signal; a .signal does not persist).  But
# it's a weakness because .clear'ing an event is error-prone:  it's easy
# to mistakenly .clear an event before all the threads you intended to
# see the event get around to .wait'ing on it.  But so long as you don't
# need to .clear an event, events are easy to use safely.
#
# SEMAPHORES
#
# A semaphore object is created via
#   import this_module
#   your_semaphore = this_module.semaphore(count=1)
#
# A semaphore has an integer count associated with it.  The initial value
# of the count is specified by the optional argument (which defaults to
# 1) passed to the semaphore constructor.
#
# Methods:
#
#   .p()
#      If the semaphore's count is greater than 0, decrements the count
#      by 1 and returns.
#      Else if the semaphore's count is 0, blocks the calling thread
#      until a subsequent .v() increases the count.  When that happens,
#      the count will be decremented by 1 and the calling thread resumed.
#
#   .v()
#      Increments the semaphore's count by 1, and wakes up a thread (if
#      any) blocked by a .p().  It's an (detected) error for a .v() to
#      increase the semaphore's count to a value larger than the initial
#      count.
#
# MULTIPLE-READER SINGLE-WRITER LOCKS
#
# A mrsw lock is created via
#   import this_module
#   your_mrsw_lock = this_module.mrsw()
#
# This kind of lock is often useful with complex shared data structures.
# The object lets any number of "readers" proceed, so long as no thread
# wishes to "write".  When a (one or more) thread declares its intention
# to "write" (e.g., to update a shared structure), all current readers
# are allowed to finish, and then a writer gets exclusive access; all
# other readers & writers are blocked until the current writer completes.
# Finally, if some thread is waiting to write and another is waiting to
# read, the writer takes precedence.
#
# Methods:
#
#   .read_in()
#      If no thread is writing or waiting to write, returns immediately.
#      Else blocks until no thread is writing or waiting to write.  So
#      long as some thread has completed a .read_in but not a .read_out,
#      writers are blocked.
#
#   .read_out()
#      Use sometime after a .read_in to declare that the thread is done
#      reading.  When all threads complete reading, a writer can proceed.
#
#   .write_in()
#      If no thread is writing (has completed a .write_in, but hasn't yet
#      done a .write_out) or reading (similarly), returns immediately.
#      Else blocks the calling thread, and threads waiting to read, until
#      the current writer completes writing or all the current readers
#      complete reading; if then more than one thread is waiting to
#      write, one of them is allowed to proceed, but which one is not
#      specified.
#
#   .write_out()
#      Use sometime after a .write_in to declare that the thread is done
#      writing.  Then if some other thread is waiting to write, it's
#      allowed to proceed.  Else all threads (if any) waiting to read are
#      allowed to proceed.
#
#   .write_to_read()
#      Use instead of a .write_in to declare that the thread is done
#      writing but wants to continue reading without other writers
#      intervening.  If there are other threads waiting to write, they
#      are allowed to proceed only if the current thread calls
#      .read_out; threads waiting to read are only allowed to proceed
#      if there are no threads waiting to write.  (This is a
#      weakness of the interface!)

import thread

class condition:
    def __init__(self, lock=None):
        # the lock actually used by .acquire() and .release()
        if lock is None:
            self.mutex = thread.allocate_lock()
        else:
            if hasattr(lock, 'acquire') and \
               hasattr(lock, 'release'):
                self.mutex = lock
            else:
                raise TypeError, 'condition constructor requires ' \
                                 'a lock argument'

        # lock used to block threads until a signal
        self.checkout = thread.allocate_lock()
        self.checkout.acquire()

        # internal critical-section lock, & the data it protects
        self.idlock = thread.allocate_lock()
        self.id = 0
        self.waiting = 0  # num waiters subject to current release
        self.pending = 0  # num waiters awaiting next signal
        self.torelease = 0      # num waiters to release
        self.releasing = 0      # 1 iff release is in progress

    def acquire(self):
        self.mutex.acquire()

    def release(self):
        self.mutex.release()

    def wait(self):
        mutex, checkout, idlock = self.mutex, self.checkout, self.idlock
        if not mutex.locked():
            raise ValueError, \
                  "condition must be .acquire'd when .wait() invoked"

        idlock.acquire()
        myid = self.id
        self.pending = self.pending + 1
        idlock.release()

        mutex.release()

        while 1:
            checkout.acquire(); idlock.acquire()
            if myid < self.id:
                break
            checkout.release(); idlock.release()

        self.waiting = self.waiting - 1
        self.torelease = self.torelease - 1
        if self.torelease:
            checkout.release()
        else:
            self.releasing = 0
            if self.waiting == self.pending == 0:
                self.id = 0
        idlock.release()
        mutex.acquire()

    def signal(self):
        self.broadcast(1)

    def broadcast(self, num = -1):
        if num < -1:
            raise ValueError, '.broadcast called with num %r' % (num,)
        if num == 0:
            return
        self.idlock.acquire()
        if self.pending:
            self.waiting = self.waiting + self.pending
            self.pending = 0
            self.id = self.id + 1
        if num == -1:
            self.torelease = self.waiting
        else:
            self.torelease = min( self.waiting,
                                  self.torelease + num )
        if self.torelease and not self.releasing:
            self.releasing = 1
            self.checkout.release()
        self.idlock.release()

class barrier:
    def __init__(self, n):
        self.n = n
        self.togo = n
        self.full = condition()

    def enter(self):
        full = self.full
        full.acquire()
        self.togo = self.togo - 1
        if self.togo:
            full.wait()
        else:
            self.togo = self.n
            full.broadcast()
        full.release()

class event:
    def __init__(self):
        self.state  = 0
        self.posted = condition()

    def post(self):
        self.posted.acquire()
        self.state = 1
        self.posted.broadcast()
        self.posted.release()

    def clear(self):
        self.posted.acquire()
        self.state = 0
        self.posted.release()

    def is_posted(self):
        self.posted.acquire()
        answer = self.state
        self.posted.release()
        return answer

    def wait(self):
        self.posted.acquire()
        if not self.state:
            self.posted.wait()
        self.posted.release()

class semaphore:
    def __init__(self, count=1):
        if count <= 0:
            raise ValueError, 'semaphore count %d; must be >= 1' % count
        self.count = count
        self.maxcount = count
        self.nonzero = condition()

    def p(self):
        self.nonzero.acquire()
        while self.count == 0:
            self.nonzero.wait()
        self.count = self.count - 1
        self.nonzero.release()

    def v(self):
        self.nonzero.acquire()
        if self.count == self.maxcount:
            raise ValueError, '.v() tried to raise semaphore count above ' \
                  'initial value %r' % self.maxcount
        self.count = self.count + 1
        self.nonzero.signal()
        self.nonzero.release()

class mrsw:
    def __init__(self):
        # critical-section lock & the data it protects
        self.rwOK = thread.allocate_lock()
        self.nr = 0  # number readers actively reading (not just waiting)
        self.nw = 0  # number writers either waiting to write or writing
        self.writing = 0  # 1 iff some thread is writing

        # conditions
        self.readOK  = condition(self.rwOK)  # OK to unblock readers
        self.writeOK = condition(self.rwOK)  # OK to unblock writers

    def read_in(self):
        self.rwOK.acquire()
        while self.nw:
            self.readOK.wait()
        self.nr = self.nr + 1
        self.rwOK.release()

    def read_out(self):
        self.rwOK.acquire()
        if self.nr <= 0:
            raise ValueError, \
                  '.read_out() invoked without an active reader'
        self.nr = self.nr - 1
        if self.nr == 0:
            self.writeOK.signal()
        self.rwOK.release()

    def write_in(self):
        self.rwOK.acquire()
        self.nw = self.nw + 1
        while self.writing or self.nr:
            self.writeOK.wait()
        self.writing = 1
        self.rwOK.release()

    def write_out(self):
        self.rwOK.acquire()
        if not self.writing:
            raise ValueError, \
                  '.write_out() invoked without an active writer'
        self.writing = 0
        self.nw = self.nw - 1
        if self.nw:
            self.writeOK.signal()
        else:
            self.readOK.broadcast()
        self.rwOK.release()

    def write_to_read(self):
        self.rwOK.acquire()
        if not self.writing:
            raise ValueError, \
                  '.write_to_read() invoked without an active writer'
        self.writing = 0
        self.nw = self.nw - 1
        self.nr = self.nr + 1
        if not self.nw:
            self.readOK.broadcast()
        self.rwOK.release()

# The rest of the file is a test case, that runs a number of parallelized
# quicksorts in parallel.  If it works, you'll get about 600 lines of
# tracing output, with a line like
#     test passed! 209 threads created in all
# as the last line.  The content and order of preceding lines will
# vary across runs.

def _new_thread(func, *args):
    global TID
    tid.acquire(); id = TID = TID+1; tid.release()
    io.acquire(); alive.append(id); \
                  print 'starting thread', id, '--', len(alive), 'alive'; \
                  io.release()
    thread.start_new_thread( func, (id,) + args )

def _qsort(tid, a, l, r, finished):
    # sort a[l:r]; post finished when done
    io.acquire(); print 'thread', tid, 'qsort', l, r; io.release()
    if r-l > 1:
        pivot = a[l]
        j = l+1   # make a[l:j] <= pivot, and a[j:r] > pivot
        for i in range(j, r):
            if a[i] <= pivot:
                a[j], a[i] = a[i], a[j]
                j = j + 1
        a[l], a[j-1] = a[j-1], pivot

        l_subarray_sorted = event()
        r_subarray_sorted = event()
        _new_thread(_qsort, a, l, j-1, l_subarray_sorted)
        _new_thread(_qsort, a, j, r,   r_subarray_sorted)
        l_subarray_sorted.wait()
        r_subarray_sorted.wait()

    io.acquire(); print 'thread', tid, 'qsort done'; \
                  alive.remove(tid); io.release()
    finished.post()

def _randarray(tid, a, finished):
    io.acquire(); print 'thread', tid, 'randomizing array'; \
                  io.release()
    for i in range(1, len(a)):
        wh.acquire(); j = randint(0,i); wh.release()
        a[i], a[j] = a[j], a[i]
    io.acquire(); print 'thread', tid, 'randomizing done'; \
                  alive.remove(tid); io.release()
    finished.post()

def _check_sort(a):
    if a != range(len(a)):
        raise ValueError, ('a not sorted', a)

def _run_one_sort(tid, a, bar, done):
    # randomize a, and quicksort it
    # for variety, all the threads running this enter a barrier
    # at the end, and post `done' after the barrier exits
    io.acquire(); print 'thread', tid, 'randomizing', a; \
                  io.release()
    finished = event()
    _new_thread(_randarray, a, finished)
    finished.wait()

    io.acquire(); print 'thread', tid, 'sorting', a; io.release()
    finished.clear()
    _new_thread(_qsort, a, 0, len(a), finished)
    finished.wait()
    _check_sort(a)

    io.acquire(); print 'thread', tid, 'entering barrier'; \
                  io.release()
    bar.enter()
    io.acquire(); print 'thread', tid, 'leaving barrier'; \
                  io.release()
    io.acquire(); alive.remove(tid); io.release()
    bar.enter() # make sure they've all removed themselves from alive
                ##  before 'done' is posted
    bar.enter() # just to be cruel
    done.post()

def test():
    global TID, tid, io, wh, randint, alive
    import random
    randint = random.randint

    TID = 0                             # thread ID (1, 2, ...)
    tid = thread.allocate_lock()        # for changing TID
    io  = thread.allocate_lock()        # for printing, and 'alive'
    wh  = thread.allocate_lock()        # for calls to random
    alive = []                          # IDs of active threads

    NSORTS = 5
    arrays = []
    for i in range(NSORTS):
        arrays.append( range( (i+1)*10 ) )

    bar = barrier(NSORTS)
    finished = event()
    for i in range(NSORTS):
        _new_thread(_run_one_sort, arrays[i], bar, finished)
    finished.wait()

    print 'all threads done, and checking results ...'
    if alive:
        raise ValueError, ('threads still alive at end', alive)
    for i in range(NSORTS):
        a = arrays[i]
        if len(a) != (i+1)*10:
            raise ValueError, ('length of array', i, 'screwed up')
        _check_sort(a)

    print 'test passed!', TID, 'threads created in all'

if __name__ == '__main__':
    test()

# end of module

Youez - 2016 - github.com/yon3zu
LinuXploit