def start(self, stop_on_exit=True, profile_children=True):
"""Start the profiler.
:param stop_on_exit: Whether to stop the profiler and flush the profile on exit.
:param profile_children: Whether to start a profiler in child processes.
"""
if profile_children:
try:
uwsgi.check_uwsgi(self._restart_on_fork,
atexit=self.stop if stop_on_exit else None)
except uwsgi.uWSGIMasterProcess:
# Do nothing, the start() method will be called in each worker subprocess
return
self._profiler.start()
if stop_on_exit:
atexit.register(self.stop)
if profile_children:
if hasattr(os, "register_at_fork"):
os.register_at_fork(after_in_child=self._restart_on_fork)
else:
LOG.warning(
"Your Python version does not have `os.register_at_fork`. "
"You have to start a new Profiler after fork() manually.")
def test_register():
def foobar():
pass
atexit.register(foobar)
atexit.unregister(foobar)
atexit.unregister(foobar)
def test_prog_unregister():
from ddtrace.internal import atexit
def foobar():
print("hello")
atexit.register(foobar)
atexit.unregister(foobar)
def test_prog_register():
from ddtrace.internal import atexit
def foobar(what):
print("hello")
print(what)
atexit.register(foobar, "world")
def test_prog_unregister(run_python_code_in_subprocess):
out, err, status, pid = run_python_code_in_subprocess("""
from ddtrace.internal import atexit
def foobar():
print("hello")
atexit.register(foobar)
atexit.unregister(foobar)
""")
assert status == 0
assert out == b""
assert err == b""
def test_prog_register(run_python_code_in_subprocess):
out, err, status, pid = run_python_code_in_subprocess("""
from ddtrace.internal import atexit
def foobar(what):
print("hello")
print(what)
atexit.register(foobar, "world")
""")
assert status == 0
assert out == b"hello\nworld\n"
assert err == b""