[Jython-checkins] SF.net SVN: jython: [4802] branches/asm/Lib/test/test_thread.py

[<zy...@us...>]

Revision: 4802
          http://jython.svn.sourceforge.net/jython/?rev=4802&view=rev
Author:   zyasoft
Date:     2008-06-26 21:30:59 -0700 (Thu, 26 Jun 2008)

Log Message:
-----------
Enable testing of stack size changing for java platform

Added Paths:
-----------
    branches/asm/Lib/test/test_thread.py

Added: branches/asm/Lib/test/test_thread.py
===================================================================
--- branches/asm/Lib/test/test_thread.py	                        (rev 0)
+++ branches/asm/Lib/test/test_thread.py	2008-06-27 04:30:59 UTC (rev 4802)
@@ -0,0 +1,160 @@
+# Very rudimentary test of thread module
+
+# Create a bunch of threads, let each do some work, wait until all are done
+
+from test.test_support import verbose
+import random
+import thread
+import time
+
+mutex = thread.allocate_lock()
+rmutex = thread.allocate_lock() # for calls to random
+running = 0
+done = thread.allocate_lock()
+done.acquire()
+
+numtasks = 10
+
+def task(ident):
+    global running
+    rmutex.acquire()
+    delay = random.random() * numtasks
+    rmutex.release()
+    if verbose:
+        print 'task', ident, 'will run for', round(delay, 1), 'sec'
+    time.sleep(delay)
+    if verbose:
+        print 'task', ident, 'done'
+    mutex.acquire()
+    running = running - 1
+    if running == 0:
+        done.release()
+    mutex.release()
+
+next_ident = 0
+def newtask():
+    global next_ident, running
+    mutex.acquire()
+    next_ident = next_ident + 1
+    if verbose:
+        print 'creating task', next_ident
+    thread.start_new_thread(task, (next_ident,))
+    running = running + 1
+    mutex.release()
+
+for i in range(numtasks):
+    newtask()
+
+print 'waiting for all tasks to complete'
+done.acquire()
+print 'all tasks done'
+
+class barrier:
+    def __init__(self, n):
+        self.n = n
+        self.waiting = 0
+        self.checkin  = thread.allocate_lock()
+        self.checkout = thread.allocate_lock()
+        self.checkout.acquire()
+
+    def enter(self):
+        checkin, checkout = self.checkin, self.checkout
+
+        checkin.acquire()
+        self.waiting = self.waiting + 1
+        if self.waiting == self.n:
+            self.waiting = self.n - 1
+            checkout.release()
+            return
+        checkin.release()
+
+        checkout.acquire()
+        self.waiting = self.waiting - 1
+        if self.waiting == 0:
+            checkin.release()
+            return
+        checkout.release()
+
+numtrips = 3
+def task2(ident):
+    global running
+    for i in range(numtrips):
+        if ident == 0:
+            # give it a good chance to enter the next
+            # barrier before the others are all out
+            # of the current one
+            delay = 0.001
+        else:
+            rmutex.acquire()
+            delay = random.random() * numtasks
+            rmutex.release()
+        if verbose:
+            print 'task', ident, 'will run for', round(delay, 1), 'sec'
+        time.sleep(delay)
+        if verbose:
+            print 'task', ident, 'entering barrier', i
+        bar.enter()
+        if verbose:
+            print 'task', ident, 'leaving barrier', i
+    mutex.acquire()
+    running -= 1
+    # Must release mutex before releasing done, else the main thread can
+    # exit and set mutex to None as part of global teardown; then
+    # mutex.release() raises AttributeError.
+    finished = running == 0
+    mutex.release()
+    if finished:
+        done.release()
+
+print '\n*** Barrier Test ***'
+if done.acquire(0):
+    raise ValueError, "'done' should have remained acquired"
+bar = barrier(numtasks)
+running = numtasks
+for i in range(numtasks):
+    thread.start_new_thread(task2, (i,))
+done.acquire()
+print 'all tasks done'
+
+# not all platforms support changing thread stack size
+print '\n*** Changing thread stack size ***'
+if thread.stack_size() != 0:
+    raise ValueError, "initial stack_size not 0"
+
+thread.stack_size(0)
+if thread.stack_size() != 0:
+    raise ValueError, "stack_size not reset to default"
+
+from os import name as os_name
+if os_name in ("nt", "os2", "posix", "java"):
+
+    tss_supported = 1
+    try:
+        thread.stack_size(4096)
+    except ValueError:
+        print 'caught expected ValueError setting stack_size(4096)'
+    except thread.error:
+        tss_supported = 0
+        print 'platform does not support changing thread stack size'
+
+    if tss_supported:
+        failed = lambda s, e: s != e
+        fail_msg = "stack_size(%d) failed - should succeed"
+        for tss in (262144, 0x100000, 0):
+            thread.stack_size(tss)
+            if failed(thread.stack_size(), tss):
+                raise ValueError, fail_msg % tss
+            print 'successfully set stack_size(%d)' % tss
+
+        for tss in (262144, 0x100000):
+            print 'trying stack_size = %d' % tss
+            next_ident = 0
+            for i in range(numtasks):
+                newtask()
+
+            print 'waiting for all tasks to complete'
+            done.acquire()
+            print 'all tasks done'
+
+        # reset stack size to default
+        thread.stack_size(0)


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