_rwlock: remove dead code

2 files changed, 0 insertions, 266 deletions

diff --git a/src/ecdsa/_rwlock.py b/src/ecdsa/_rwlock.py
deleted file mode 100644
index 010e498..0000000
--- a/src/ecdsa/_rwlock.py
+++ /dev/null
@@ -1,86 +0,0 @@
-# Copyright Mateusz Kobos, (c) 2011
-# https://code.activestate.com/recipes/577803-reader-writer-lock-with-priority-for-writers/
-# released under the MIT licence
-
-import threading
-
-
-__author__ = "Mateusz Kobos"
-
-
-class RWLock:
-    """
-    Read-Write locking primitive
-
-    Synchronization object used in a solution of so-called second
-    readers-writers problem. In this problem, many readers can simultaneously
-    access a share, and a writer has an exclusive access to this share.
-    Additionally, the following constraints should be met:
-    1) no reader should be kept waiting if the share is currently opened for
-       reading unless a writer is also waiting for the share,
-    2) no writer should be kept waiting for the share longer than absolutely
-       necessary.
-
-    The implementation is based on [1, secs. 4.2.2, 4.2.6, 4.2.7]
-    with a modification -- adding an additional lock (C{self.__readers_queue})
-    -- in accordance with [2].
-
-    Sources:
-    [1] A.B. Downey: "The little book of semaphores", Version 2.1.5, 2008
-    [2] P.J. Courtois, F. Heymans, D.L. Parnas:
-        "Concurrent Control with 'Readers' and 'Writers'",
-        Communications of the ACM, 1971 (via [3])
-    [3] http://en.wikipedia.org/wiki/Readers-writers_problem
-    """
-
-    def __init__(self):
-        """
-        A lock giving an even higher priority to the writer in certain
-        cases (see [2] for a discussion).
-        """
-        self.__read_switch = _LightSwitch()
-        self.__write_switch = _LightSwitch()
-        self.__no_readers = threading.Lock()
-        self.__no_writers = threading.Lock()
-        self.__readers_queue = threading.Lock()
-
-    def reader_acquire(self):
-        self.__readers_queue.acquire()
-        self.__no_readers.acquire()
-        self.__read_switch.acquire(self.__no_writers)
-        self.__no_readers.release()
-        self.__readers_queue.release()
-
-    def reader_release(self):
-        self.__read_switch.release(self.__no_writers)
-
-    def writer_acquire(self):
-        self.__write_switch.acquire(self.__no_readers)
-        self.__no_writers.acquire()
-
-    def writer_release(self):
-        self.__no_writers.release()
-        self.__write_switch.release(self.__no_readers)
-
-
-class _LightSwitch:
-    """An auxiliary "light switch"-like object. The first thread turns on the
-    "switch", the last one turns it off (see [1, sec. 4.2.2] for details)."""
-
-    def __init__(self):
-        self.__counter = 0
-        self.__mutex = threading.Lock()
-
-    def acquire(self, lock):
-        self.__mutex.acquire()
-        self.__counter += 1
-        if self.__counter == 1:
-            lock.acquire()
-        self.__mutex.release()
-
-    def release(self, lock):
-        self.__mutex.acquire()
-        self.__counter -= 1
-        if self.__counter == 0:
-            lock.release()
-        self.__mutex.release()
diff --git a/src/ecdsa/test_rw_lock.py b/src/ecdsa/test_rw_lock.py
deleted file mode 100644
index 0a84b9c..0000000
--- a/src/ecdsa/test_rw_lock.py
+++ /dev/null
@@ -1,180 +0,0 @@
-# Copyright Mateusz Kobos, (c) 2011
-# https://code.activestate.com/recipes/577803-reader-writer-lock-with-priority-for-writers/
-# released under the MIT licence
-
-try:
-    import unittest2 as unittest
-except ImportError:
-    import unittest
-import threading
-import time
-import copy
-from ._rwlock import RWLock
-
-
-class Writer(threading.Thread):
-    def __init__(
-        self, buffer_, rw_lock, init_sleep_time, sleep_time, to_write
-    ):
-        """
-        @param buffer_: common buffer_ shared by the readers and writers
-        @type buffer_: list
-        @type rw_lock: L{RWLock}
-        @param init_sleep_time: sleep time before doing any action
-        @type init_sleep_time: C{float}
-        @param sleep_time: sleep time while in critical section
-        @type sleep_time: C{float}
-        @param to_write: data that will be appended to the buffer
-        """
-        threading.Thread.__init__(self)
-        self.__buffer = buffer_
-        self.__rw_lock = rw_lock
-        self.__init_sleep_time = init_sleep_time
-        self.__sleep_time = sleep_time
-        self.__to_write = to_write
-        self.entry_time = None
-        """Time of entry to the critical section"""
-        self.exit_time = None
-        """Time of exit from the critical section"""
-
-    def run(self):
-        time.sleep(self.__init_sleep_time)
-        self.__rw_lock.writer_acquire()
-        self.entry_time = time.time()
-        time.sleep(self.__sleep_time)
-        self.__buffer.append(self.__to_write)
-        self.exit_time = time.time()
-        self.__rw_lock.writer_release()
-
-
-class Reader(threading.Thread):
-    def __init__(self, buffer_, rw_lock, init_sleep_time, sleep_time):
-        """
-        @param buffer_: common buffer shared by the readers and writers
-        @type buffer_: list
-        @type rw_lock: L{RWLock}
-        @param init_sleep_time: sleep time before doing any action
-        @type init_sleep_time: C{float}
-        @param sleep_time: sleep time while in critical section
-        @type sleep_time: C{float}
-        """
-        threading.Thread.__init__(self)
-        self.__buffer = buffer_
-        self.__rw_lock = rw_lock
-        self.__init_sleep_time = init_sleep_time
-        self.__sleep_time = sleep_time
-        self.buffer_read = None
-        """a copy of a the buffer read while in critical section"""
-        self.entry_time = None
-        """Time of entry to the critical section"""
-        self.exit_time = None
-        """Time of exit from the critical section"""
-
-    def run(self):
-        time.sleep(self.__init_sleep_time)
-        self.__rw_lock.reader_acquire()
-        self.entry_time = time.time()
-        time.sleep(self.__sleep_time)
-        self.buffer_read = copy.deepcopy(self.__buffer)
-        self.exit_time = time.time()
-        self.__rw_lock.reader_release()
-
-
-class RWLockTestCase(unittest.TestCase):
-    def test_readers_nonexclusive_access(self):
-        (buffer_, rw_lock, threads) = self.__init_variables()
-
-        threads.append(Reader(buffer_, rw_lock, 0, 0))
-        threads.append(Writer(buffer_, rw_lock, 0.2, 0.4, 1))
-        threads.append(Reader(buffer_, rw_lock, 0.3, 0.3))
-        threads.append(Reader(buffer_, rw_lock, 0.5, 0))
-
-        self.__start_and_join_threads(threads)
-
-        ## The third reader should enter after the second one but it should
-        ## exit before the second one exits
-        ## (i.e. the readers should be in the critical section
-        ## at the same time)
-
-        self.assertEqual([], threads[0].buffer_read)
-        self.assertEqual([1], threads[2].buffer_read)
-        self.assertEqual([1], threads[3].buffer_read)
-        self.assertTrue(threads[1].exit_time <= threads[2].entry_time)
-        self.assertTrue(threads[2].entry_time <= threads[3].entry_time)
-        self.assertTrue(threads[3].exit_time < threads[2].exit_time)
-
-    def test_writers_exclusive_access(self):
-        (buffer_, rw_lock, threads) = self.__init_variables()
-
-        threads.append(Writer(buffer_, rw_lock, 0, 0.4, 1))
-        threads.append(Writer(buffer_, rw_lock, 0.1, 0, 2))
-        threads.append(Reader(buffer_, rw_lock, 0.2, 0))
-
-        self.__start_and_join_threads(threads)
-
-        ## The second writer should wait for the first one to exit
-
-        self.assertEqual([1, 2], threads[2].buffer_read)
-        self.assertTrue(threads[0].exit_time <= threads[1].entry_time)
-        self.assertTrue(threads[1].exit_time <= threads[2].exit_time)
-
-    def test_writer_priority(self):
-        (buffer_, rw_lock, threads) = self.__init_variables()
-
-        threads.append(Writer(buffer_, rw_lock, 0, 0, 1))
-        threads.append(Reader(buffer_, rw_lock, 0.1, 0.4))
-        threads.append(Writer(buffer_, rw_lock, 0.2, 0, 2))
-        threads.append(Reader(buffer_, rw_lock, 0.3, 0))
-        threads.append(Reader(buffer_, rw_lock, 0.3, 0))
-
-        self.__start_and_join_threads(threads)
-
-        ## The second writer should go before the second and the third reader
-
-        self.assertEqual([1], threads[1].buffer_read)
-        self.assertEqual([1, 2], threads[3].buffer_read)
-        self.assertEqual([1, 2], threads[4].buffer_read)
-        self.assertTrue(threads[0].exit_time < threads[1].entry_time)
-        self.assertTrue(threads[1].exit_time <= threads[2].entry_time)
-        self.assertTrue(threads[2].exit_time <= threads[3].entry_time)
-        self.assertTrue(threads[2].exit_time <= threads[4].entry_time)
-
-    def test_many_writers_priority(self):
-        (buffer_, rw_lock, threads) = self.__init_variables()
-
-        threads.append(Writer(buffer_, rw_lock, 0, 0, 1))
-        threads.append(Reader(buffer_, rw_lock, 0.1, 0.6))
-        threads.append(Writer(buffer_, rw_lock, 0.2, 0.1, 2))
-        threads.append(Reader(buffer_, rw_lock, 0.3, 0))
-        threads.append(Reader(buffer_, rw_lock, 0.4, 0))
-        threads.append(Writer(buffer_, rw_lock, 0.5, 0.1, 3))
-
-        self.__start_and_join_threads(threads)
-
-        ## The two last writers should go first -- after the first reader and
-        ## before the second and the third reader
-
-        self.assertEqual([1], threads[1].buffer_read)
-        self.assertEqual([1, 2, 3], threads[3].buffer_read)
-        self.assertEqual([1, 2, 3], threads[4].buffer_read)
-        self.assertTrue(threads[0].exit_time < threads[1].entry_time)
-        self.assertTrue(threads[1].exit_time <= threads[2].entry_time)
-        self.assertTrue(threads[1].exit_time <= threads[5].entry_time)
-        self.assertTrue(threads[2].exit_time <= threads[3].entry_time)
-        self.assertTrue(threads[2].exit_time <= threads[4].entry_time)
-        self.assertTrue(threads[5].exit_time <= threads[3].entry_time)
-        self.assertTrue(threads[5].exit_time <= threads[4].entry_time)
-
-    @staticmethod
-    def __init_variables():
-        buffer_ = []
-        rw_lock = RWLock()
-        threads = []
-        return (buffer_, rw_lock, threads)
-
-    @staticmethod
-    def __start_and_join_threads(threads):
-        for t in threads:
-            t.start()
-        for t in threads:
-            t.join()