Remove monotonic lib as it's unused on Python 3+

Author: TimPansino

THIRD_PARTY_NOTICES.md

@@ -35,15 +35,6 @@ Distributed under the following license(s):
 * [The Apache License, Version 2.0 License](https://opensource.org/license/apache-2-0/)
 
 
-## [time.monotonic](newrelic/common/_monotonic.c)
-
-Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Python Software Foundation; All Rights Reserved
-
-Distributed under the following license(s):
-
-* [Python Software Foundation](https://docs.python.org/3/license.html)
-
-
 ## [urllib3](https://pypi.org/project/urllib3)
 
 Copyright (c) 2008-2019 Andrey Petrov and contributors (see CONTRIBUTORS.txt)

newrelic/common/_monotonic.c

@@ -20,36 +20,9 @@
 
 import time
 
-try:
-    # Python 3.3 and later implements PEP 418. Use the
-    # performance counter it provides which is monotonically
-    # increasing.
+default_timer = time.perf_counter
+timer_implementation = "time.perf_counter()"
 
-    default_timer = time.perf_counter
-    timer_implementation = "time.perf_counter()"
-
-except AttributeError:
-    try:
-        # Next try our own bundled back port of the monotonic()
-        # function. Python 3.3 does on Windows use a different
-        # clock for the performance counter, but the standard
-        # monotonic clock should suit our requirements okay.
-
-        from newrelic.common._monotonic import monotonic as default_timer
-
-        default_timer()
-        timer_implementation = "_monotonic.monotonic()"
-
-    except (ImportError, NotImplementedError, OSError):
-        # If neither of the above, fallback to using the default
-        # timer from the timeit module. This will use the best
-        # resolution clock available on a particular platform,
-        # albeit that it isn't monotonically increasing.
-
-        import timeit
-
-        default_timer = timeit.default_timer
-        timer_implementation = "timeit.default_timer()"
 
 # A timer class which deals with remembering the start time based on
 # wall clock time and duration based on a monotonic clock where

newrelic/common/stopwatch.py

@@ -191,16 +191,6 @@ def build_extension(self, ext):
     kwargs["scripts"] = ["scripts/newrelic-admin"]
 
 
-def with_librt():
-    try:
-        if sys.platform.startswith("linux"):
-            import ctypes.util
-
-            return ctypes.util.find_library("rt")
-    except Exception:
-        pass
-
-
 def run_setup(with_extensions):
     def _run_setup():
         # Create a local copy of kwargs, if there is no c compiler run_setup
@@ -209,15 +199,8 @@ def _run_setup():
         kwargs_tmp = dict(kwargs)
 
         if with_extensions:
-            monotonic_libraries = []
-            if with_librt():
-                monotonic_libraries = ["rt"]
-
             kwargs_tmp["ext_modules"] = [
                 Extension("newrelic.packages.wrapt._wrappers", ["newrelic/packages/wrapt/_wrappers.c"]),
-                Extension(
-                    "newrelic.common._monotonic", ["newrelic/common/_monotonic.c"], libraries=monotonic_libraries
-                ),
                 Extension("newrelic.core._thread_utilization", ["newrelic/core/_thread_utilization.c"]),
             ]
             kwargs_tmp["cmdclass"] = dict(build_ext=optional_build_ext)