initial creation

py3interm/EXAMPLES/thr_queue.py

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+#!/usr/bin/env python
+import random
+import queue
+from threading import Thread, Lock as tlock
+import time
+
+NUM_ITEMS = 25000
+POOL_SIZE = 100
+
+q = queue.Queue(0)  # <1>
+
+shared_list = []
+shlist_lock = tlock()  # <2>
+stdout_lock = tlock()  # <2>
+
+
+class RandomWord():  # <3>
+    def __init__(self):
+        with open('../DATA/words.txt') as words_in:
+            self._words = [word.rstrip('\n\r') for word in words_in.readlines()]
+        self._num_words = len(self._words)
+
+    def __call__(self):
+        return self._words[random.randrange(0, self._num_words)]
+
+
+class Worker(Thread):  # <4>
+
+    def __init__(self, name):  # <5>
+        Thread.__init__(self)
+        self.name = name
+
+    def run(self):  # <6>
+        while True:
+            try:
+                s1 = q.get(block=False)  # <7>
+                s2 = s1.upper() + '-' + s1.upper()
+                with shlist_lock:  # <8>
+                    shared_list.append(s2)
+
+            except queue.Empty:  # <9>
+                break
+
+
+# <10>
+random_word = RandomWord()
+for i in range(NUM_ITEMS):
+    w = random_word()
+    q.put(w)
+
+start_time = time.ctime()
+
+# <11>
+pool = []
+for i in range(POOL_SIZE):
+    worker_name = "Worker {:c}".format(i + 65)
+    w = Worker(worker_name)  # <12>
+    w.start()  # <13>
+    pool.append(w)
+
+for t in pool:
+    t.join()  # <14>
+
+end_time = time.ctime()
+
+print(shared_list[:20])
+
+print(start_time)
+print(end_time)