def test_2_join_in_forked_process(self):
# Like the test above, but from a forked interpreter
script = """if 1:
childpid = os.fork()
if childpid != 0:
os.waitpid(childpid, 0)
sys.exit(0)
t = threading.Thread(target=joiningfunc,
args=(threading.current_thread(),))
t.start()
print 'end of main'
"""
self._run_and_join(script)
python类start()的实例源码
def test_start_thread_again(self):
thread = threading.Thread()
thread.start()
self.assertRaises(RuntimeError, thread.start)
def test_daemonize_active_thread(self):
thread = threading.Thread()
thread.start()
self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
def test_print_exception_stderr_is_none_1(self):
script = r"""if 1:
import sys
import threading
import time
running = False
def run():
global running
running = True
while running:
time.sleep(0.01)
1.0/0.0
t = threading.Thread(target=run)
t.start()
while not running:
time.sleep(0.01)
sys.stderr = None
running = False
t.join()
"""
rc, out, err = assert_python_ok("-c", script)
self.assertEqual(out, '')
self.assertIn("Exception in thread", err)
self.assertIn("Traceback (most recent call last):", err)
self.assertIn("ZeroDivisionError", err)
self.assertNotIn("Unhandled exception", err)
def test_recursion_limit(self):
# Issue 9670
# test that excessive recursion within a non-main thread causes
# an exception rather than crashing the interpreter on platforms
# like Mac OS X or FreeBSD which have small default stack sizes
# for threads
script = """if True:
import threading
def recurse():
return recurse()
def outer():
try:
recurse()
except RuntimeError:
pass
w = threading.Thread(target=outer)
w.start()
w.join()
print('end of main thread')
"""
expected_output = "end of main thread\n"
p = subprocess.Popen([sys.executable, "-c", script],
stdout=subprocess.PIPE)
stdout, stderr = p.communicate()
data = stdout.decode().replace('\r', '')
self.assertEqual(p.returncode, 0, "Unexpected error")
self.assertEqual(data, expected_output)
def test_various_ops(self):
# This takes about n/3 seconds to run (about n/3 clumps of tasks,
# times about 1 second per clump).
NUMTASKS = 10
# no more than 3 of the 10 can run at once
sema = threading.BoundedSemaphore(value=3)
mutex = threading.RLock()
numrunning = Counter()
threads = []
for i in range(NUMTASKS):
t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning)
threads.append(t)
self.assertIsNone(t.ident)
self.assertRegexpMatches(repr(t), r'^<TestThread\(.*, initial\)>$')
t.start()
if verbose:
print 'waiting for all tasks to complete'
for t in threads:
t.join(NUMTASKS)
self.assertFalse(t.is_alive())
self.assertNotEqual(t.ident, 0)
self.assertIsNotNone(t.ident)
self.assertRegexpMatches(repr(t), r'^<TestThread\(.*, \w+ -?\d+\)>$')
if verbose:
print 'all tasks done'
self.assertEqual(numrunning.get(), 0)
def test_limbo_cleanup(self):
# Issue 7481: Failure to start thread should cleanup the limbo map.
def fail_new_thread(*args):
raise thread.error()
_start_new_thread = threading._start_new_thread
threading._start_new_thread = fail_new_thread
try:
t = threading.Thread(target=lambda: None)
self.assertRaises(thread.error, t.start)
self.assertFalse(
t in threading._limbo,
"Failed to cleanup _limbo map on failure of Thread.start().")
finally:
threading._start_new_thread = _start_new_thread
def test_finalize_with_trace(self):
# Issue1733757
# Avoid a deadlock when sys.settrace steps into threading._shutdown
p = subprocess.Popen([sys.executable, "-c", """if 1:
import sys, threading
# A deadlock-killer, to prevent the
# testsuite to hang forever
def killer():
import os, time
time.sleep(2)
print 'program blocked; aborting'
os._exit(2)
t = threading.Thread(target=killer)
t.daemon = True
t.start()
# This is the trace function
def func(frame, event, arg):
threading.current_thread()
return func
sys.settrace(func)
"""],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
stdout, stderr = p.communicate()
rc = p.returncode
self.assertFalse(rc == 2, "interpreted was blocked")
self.assertTrue(rc == 0,
"Unexpected error: " + repr(stderr))
def test_1_join_on_shutdown(self):
# The usual case: on exit, wait for a non-daemon thread
script = """if 1:
import os
t = threading.Thread(target=joiningfunc,
args=(threading.current_thread(),))
t.start()
time.sleep(0.1)
print 'end of main'
"""
self._run_and_join(script)
def test_2_join_in_forked_process(self):
# Like the test above, but from a forked interpreter
script = """if 1:
childpid = os.fork()
if childpid != 0:
os.waitpid(childpid, 0)
sys.exit(0)
t = threading.Thread(target=joiningfunc,
args=(threading.current_thread(),))
t.start()
print 'end of main'
"""
self._run_and_join(script)
def test_start_thread_again(self):
thread = threading.Thread()
thread.start()
self.assertRaises(RuntimeError, thread.start)
def test_daemonize_active_thread(self):
thread = threading.Thread()
thread.start()
self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
def test_print_exception_stderr_is_none_1(self):
script = r"""if 1:
import sys
import threading
import time
running = False
def run():
global running
running = True
while running:
time.sleep(0.01)
1.0/0.0
t = threading.Thread(target=run)
t.start()
while not running:
time.sleep(0.01)
sys.stderr = None
running = False
t.join()
"""
rc, out, err = assert_python_ok("-c", script)
self.assertEqual(out, '')
self.assertIn("Exception in thread", err)
self.assertIn("Traceback (most recent call last):", err)
self.assertIn("ZeroDivisionError", err)
self.assertNotIn("Unhandled exception", err)
def test_recursion_limit(self):
# Issue 9670
# test that excessive recursion within a non-main thread causes
# an exception rather than crashing the interpreter on platforms
# like Mac OS X or FreeBSD which have small default stack sizes
# for threads
script = """if True:
import threading
def recurse():
return recurse()
def outer():
try:
recurse()
except RuntimeError:
pass
w = threading.Thread(target=outer)
w.start()
w.join()
print('end of main thread')
"""
expected_output = "end of main thread\n"
p = subprocess.Popen([sys.executable, "-c", script],
stdout=subprocess.PIPE)
stdout, stderr = p.communicate()
data = stdout.decode().replace('\r', '')
self.assertEqual(p.returncode, 0, "Unexpected error")
self.assertEqual(data, expected_output)
def test_various_ops(self):
# This takes about n/3 seconds to run (about n/3 clumps of tasks,
# times about 1 second per clump).
NUMTASKS = 10
# no more than 3 of the 10 can run at once
sema = threading.BoundedSemaphore(value=3)
mutex = threading.RLock()
numrunning = Counter()
threads = []
for i in range(NUMTASKS):
t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning)
threads.append(t)
self.assertEqual(t.ident, None)
self.assertTrue(re.match('<TestThread\(.*, initial\)>', repr(t)))
t.start()
if verbose:
print 'waiting for all tasks to complete'
for t in threads:
t.join(NUMTASKS)
self.assertTrue(not t.is_alive())
self.assertNotEqual(t.ident, 0)
self.assertFalse(t.ident is None)
self.assertTrue(re.match('<TestThread\(.*, \w+ -?\d+\)>', repr(t)))
if verbose:
print 'all tasks done'
self.assertEqual(numrunning.get(), 0)
def test_limbo_cleanup(self):
# Issue 7481: Failure to start thread should cleanup the limbo map.
def fail_new_thread(*args):
raise thread.error()
_start_new_thread = threading._start_new_thread
threading._start_new_thread = fail_new_thread
try:
t = threading.Thread(target=lambda: None)
self.assertRaises(thread.error, t.start)
self.assertFalse(
t in threading._limbo,
"Failed to cleanup _limbo map on failure of Thread.start().")
finally:
threading._start_new_thread = _start_new_thread
def test_finalize_with_trace(self):
# Issue1733757
# Avoid a deadlock when sys.settrace steps into threading._shutdown
p = subprocess.Popen([sys.executable, "-c", """if 1:
import sys, threading
# A deadlock-killer, to prevent the
# testsuite to hang forever
def killer():
import os, time
time.sleep(2)
print 'program blocked; aborting'
os._exit(2)
t = threading.Thread(target=killer)
t.daemon = True
t.start()
# This is the trace function
def func(frame, event, arg):
threading.current_thread()
return func
sys.settrace(func)
"""],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
stdout, stderr = p.communicate()
rc = p.returncode
self.assertFalse(rc == 2, "interpreted was blocked")
self.assertTrue(rc == 0,
"Unexpected error: " + repr(stderr))
def test_1_join_on_shutdown(self):
# The usual case: on exit, wait for a non-daemon thread
script = """if 1:
import os
t = threading.Thread(target=joiningfunc,
args=(threading.current_thread(),))
t.start()
time.sleep(0.1)
print 'end of main'
"""
self._run_and_join(script)
def test_2_join_in_forked_process(self):
# Like the test above, but from a forked interpreter
script = """if 1:
childpid = os.fork()
if childpid != 0:
os.waitpid(childpid, 0)
sys.exit(0)
t = threading.Thread(target=joiningfunc,
args=(threading.current_thread(),))
t.start()
print 'end of main'
"""
self._run_and_join(script)
def test_start_thread_again(self):
thread = threading.Thread()
thread.start()
self.assertRaises(RuntimeError, thread.start)
