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import gc
import sys
import time
import threading
import unittest
from greenlet import greenlet
class SomeError(Exception):
pass
def fmain(seen):
try:
greenlet.getcurrent().parent.switch()
except:
seen.append(sys.exc_info()[0])
raise
raise SomeError
def send_exception(g, exc):
# note: send_exception(g, exc) can be now done with g.throw(exc).
# the purpose of this test is to explicitely check the propagation rules.
def crasher(exc):
raise exc
g1 = greenlet(crasher, parent=g)
g1.switch(exc)
class GreenletTests(unittest.TestCase):
def test_simple(self):
lst = []
def f():
lst.append(1)
greenlet.getcurrent().parent.switch()
lst.append(3)
g = greenlet(f)
lst.append(0)
g.switch()
lst.append(2)
g.switch()
lst.append(4)
self.assertEquals(lst, list(range(5)))
def test_threads(self):
success = []
def f():
self.test_simple()
success.append(True)
ths = [threading.Thread(target=f) for i in range(10)]
for th in ths:
th.start()
for th in ths:
th.join()
self.assertEquals(len(success), len(ths))
def test_exception(self):
seen = []
g1 = greenlet(fmain)
g2 = greenlet(fmain)
g1.switch(seen)
g2.switch(seen)
g2.parent = g1
self.assertEquals(seen, [])
self.assertRaises(SomeError, g2.switch)
self.assertEquals(seen, [SomeError])
g2.switch()
self.assertEquals(seen, [SomeError])
def test_send_exception(self):
seen = []
g1 = greenlet(fmain)
g1.switch(seen)
self.assertRaises(KeyError, send_exception, g1, KeyError)
self.assertEquals(seen, [KeyError])
def test_dealloc(self):
seen = []
g1 = greenlet(fmain)
g2 = greenlet(fmain)
g1.switch(seen)
g2.switch(seen)
self.assertEquals(seen, [])
del g1
gc.collect()
self.assertEquals(seen, [greenlet.GreenletExit])
del g2
gc.collect()
self.assertEquals(seen, [greenlet.GreenletExit, greenlet.GreenletExit])
def test_dealloc_other_thread(self):
seen = []
someref = []
lock = threading.Lock()
lock.acquire()
lock2 = threading.Lock()
lock2.acquire()
def f():
g1 = greenlet(fmain)
g1.switch(seen)
someref.append(g1)
del g1
gc.collect()
lock.release()
lock2.acquire()
greenlet() # trigger release
lock.release()
lock2.acquire()
t = threading.Thread(target=f)
t.start()
lock.acquire()
self.assertEquals(seen, [])
self.assertEquals(len(someref), 1)
del someref[:]
gc.collect()
# g1 is not released immediately because it's from another thread
self.assertEquals(seen, [])
lock2.release()
lock.acquire()
self.assertEquals(seen, [greenlet.GreenletExit])
lock2.release()
t.join()
def test_frame(self):
def f1():
f = sys._getframe(0)
self.assertEquals(f.f_back, None)
greenlet.getcurrent().parent.switch(f)
return "meaning of life"
g = greenlet(f1)
frame = g.switch()
self.assertTrue(frame is g.gr_frame)
self.assertTrue(g)
next = g.switch()
self.assertFalse(g)
self.assertEquals(next, 'meaning of life')
self.assertEquals(g.gr_frame, None)
def test_thread_bug(self):
def runner(x):
g = greenlet(lambda: time.sleep(x))
g.switch()
t1 = threading.Thread(target=runner, args=(0.2,))
t2 = threading.Thread(target=runner, args=(0.3,))
t1.start()
t2.start()
t1.join()
t2.join()
def test_switch_kwargs(self):
def foo(a, b):
self.assertEquals(a, 4)
self.assertEquals(b, 2)
greenlet(foo).switch(a=4, b=2)
def test_switch_kwargs_to_parent(self):
def foo(x):
greenlet.getcurrent().parent.switch(x=x)
greenlet.getcurrent().parent.switch(2, x=3)
return x, x ** 2
g = greenlet(foo)
self.assertEquals({'x': 3}, g.switch(3))
self.assertEquals(((2,), {'x': 3}), g.switch())
self.assertEquals((3, 9), g.switch())
def test_switch_to_another_thread(self):
data = {}
error = None
created_event = threading.Event()
done_event = threading.Event()
def foo():
data['g'] = greenlet(lambda: None)
created_event.set()
done_event.wait()
thread = threading.Thread(target=foo)
thread.start()
created_event.wait()
try:
data['g'].switch()
except greenlet.error:
error = sys.exc_info()[1]
self.assertTrue(error != None, "greenlet.error was not raised!")
done_event.set()
thread.join()
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