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import thread, time
from pypy.module.thread.test.support import GenericTestThread
class AppTestThread(GenericTestThread):
def setup_class(cls):
GenericTestThread.setup_class.im_func(cls)
# if we cannot start more than, say, 1000 threads on this OS, then
# we can check that we get the proper error at app-level
space = cls.space
lock = thread.allocate_lock()
lock.acquire()
def f():
lock.acquire()
lock.release()
start = thread._count()
try:
try:
for i in range(1000):
thread.start_new_thread(f, ())
finally:
lock.release()
except (thread.error, MemoryError):
cls.w_can_start_many_threads = space.wrap(False)
else:
cls.w_can_start_many_threads = space.wrap(True)
# wait a bit to allow all threads to finish now
remaining = thread._count()
retries = 0
while remaining > start:
retries += 1
if retries == 200:
raise Exception("the test's threads don't stop!")
time.sleep(0.2)
remaining = thread._count()
def test_thread_error(self):
import _thread
assert _thread.error is RuntimeError # uh, since CPython 3.3
def test_start_new_thread(self):
import _thread
feedback = []
please_start = []
def f(x, y, z):
self.waitfor(lambda: please_start)
feedback.append(42)
_thread.start_new_thread(f, (1, 2), {'z': 3})
assert feedback == [] # still empty
please_start.append(1) # trigger
self.waitfor(lambda: feedback)
assert feedback == [42]
def test_thread_count(self):
import _thread, time
feedback = []
please_start = []
def f():
feedback.append(42)
self.waitfor(lambda: please_start)
assert _thread._count() == 0
_thread.start_new_thread(f, ())
self.waitfor(lambda: feedback)
assert _thread._count() == 1
please_start.append(1) # trigger
# XXX joining a thread seems difficult at applevel.
def test_start_new_thread_args(self):
import _thread
def f():
pass
test_args = [
(f, [], {}),
(f, (), []),
("", (), {}),
]
for args in test_args:
try:
_thread.start_new_thread(*args)
assert False
except TypeError:
pass
def test_get_ident(self):
import _thread
ident = _thread.get_ident()
feedback = []
def f():
feedback.append(_thread.get_ident())
ident2 = _thread.start_new_thread(f, ())
assert ident2 != ident
assert ident == _thread.get_ident()
self.waitfor(lambda: feedback)
assert feedback == [ident2]
def test_sys_getframe(self):
# this checks that each thread gets its own ExecutionContext.
def main():
import _thread, sys
def dump_frames(feedback):
f = sys._getframe()
for i in range(3):
if f is None:
feedback.append(None)
else:
feedback.append(f.f_code.co_name)
self.busywait(0.04)
assert f is sys._getframe(i)
f = f.f_back
def dummyfn(feedback):
dump_frames(feedback)
feedback = []
dummyfn(feedback)
assert feedback == ['dump_frames', 'dummyfn', 'main']
feedbacks = []
for i in range(3):
feedback = []
_thread.start_new_thread(dummyfn, (feedback,))
feedbacks.append(feedback)
expected = 3*[['dump_frames', 'dummyfn', None]] # without 'main'
self.waitfor(lambda: feedbacks == expected)
assert feedbacks == expected
main()
def test_thread_exit(self):
import _thread, sys, io
def fn1():
_thread.exit()
def fn2():
raise SystemExit
def fn3():
raise ValueError("hello world")
prev = sys.stderr
try:
sys.stderr = io.StringIO()
_thread.start_new_thread(fn1, ())
_thread.start_new_thread(fn2, ())
self.busywait(0.2) # time for the threads to finish
assert sys.stderr.getvalue() == ''
sys.stderr = io.StringIO()
_thread.start_new_thread(fn3, ())
self.waitfor(lambda: "ValueError" in sys.stderr.getvalue())
result = sys.stderr.getvalue().splitlines()
#assert result[0].startswith("Unhandled exception in thread ")
assert result[1].startswith("Traceback ")
assert result[-1] == "ValueError: hello world"
finally:
sys.stderr = prev
def test_perthread_excinfo(self):
import _thread, sys
done = []
def fn1(n):
success = False
try:
caught = False
try:
try:
{}[n]
except KeyError:
self.busywait(0.05)
caught = True
raise
except KeyError:
self.busywait(0.05)
assert caught
etype, evalue, etb = sys.exc_info()
assert etype is KeyError
assert evalue.args[0] == n
success = True
finally:
done.append(success)
for i in range(20):
_thread.start_new_thread(fn1, (i,))
self.waitfor(lambda: len(done) == 20)
assert done == 20*[True] # see stderr for failures in the threads
def test_no_corruption(self):
import _thread
lst = []
done_marker = []
def f(x, done):
for j in range(40):
lst.insert(0, x+j) # all threads trying to modify the same list
done.append(True)
for i in range(0, 120, 40):
done = []
_thread.start_new_thread(f, (i, done))
done_marker.append(done)
for done in done_marker:
self.waitfor(lambda: done, delay=3)
assert done # see stderr for failures in threads
assert sorted(lst) == list(range(120))
def test_many_threads(self):
import _thread, time, sys
if self.can_start_many_threads or sys.platform == 'win32':
skip("this OS supports too many threads to check (> 1000)")
lock = _thread.allocate_lock()
lock.acquire()
count = [0]
def f():
count[0] += 1
lock.acquire()
lock.release()
count[0] -= 1
try:
try:
for i in range(1000):
_thread.start_new_thread(f, ())
finally:
lock.release()
# wait a bit to allow most threads to finish now
while count[0] > 10:
print(count[0]) # <- releases the GIL
print("ok.")
except (_thread.error, MemoryError):
pass
else:
raise Exception("could unexpectedly start 1000 threads")
# safety: check that we can start a new thread here
_thread.start_new_thread(lambda: None, ())
def test_stack_size(self):
import _thread
_thread.stack_size(0)
res = _thread.stack_size(0)
assert res == 0
res = _thread.stack_size(1024*1024)
assert res == 0
res = _thread.stack_size(2*1024*1024)
assert res == 1024*1024
res = _thread.stack_size(0)
assert res == 2*1024*1024
def test_interrupt_main(self):
import _thread, time
import signal
def f():
for x in range(40):
if waiting:
_thread.interrupt_main()
return
time.sleep(0.1)
def busy_wait():
waiting.append(None)
for x in range(50):
time.sleep(0.1)
waiting.pop()
# This is normally called by app_main.py
signal.signal(signal.SIGINT, signal.default_int_handler)
for i in range(100):
print()
print("loop", i)
waiting = []
_thread.start_new_thread(f, ())
raises(KeyboardInterrupt, busy_wait)
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