atexit: switch to home-grown implementation

contrib/memory.py

@@ -12,7 +12,6 b' prints it to ``stderr`` on exit.'
 '''
 
 from __future__ import absolute_import
-import atexit
 
 def memusage(ui):
     """Report memory usage of the current process."""
@@ -29,4 +28,4 b' def memusage(ui):'
                             for k, v in result.iteritems()]) + "\n")
 
 def extsetup(ui):
-    atexit.register(memusage, ui)
+    ui.atexit(memusage, ui)

mercurial/dispatch.py

@@ -7,7 +7,6 b''
 
 from __future__ import absolute_import, print_function
 
-import atexit
 import difflib
 import errno
 import getopt
@@ -767,7 +766,7 b' def _dispatch(req):'
                 ui.warn(
                     _("time: real %.3f secs (user %.3f+%.3f sys %.3f+%.3f)\n") %
                     (t[4]-s[4], t[0]-s[0], t[2]-s[2], t[1]-s[1], t[3]-s[3]))
-            atexit.register(print_time)
+            ui.atexit(print_time)
 
         if options['verbose'] or options['debug'] or options['quiet']:
             for opt in ('verbose', 'debug', 'quiet'):

mercurial/ui.py

@@ -7,7 +7,6 b''
 
 from __future__ import absolute_import
 
-import atexit
 import collections
 import contextlib
 import errno
@@ -937,7 +936,7 b' class ui(object):'
         if self._isatty(util.stderr):
             os.dup2(pager.stdin.fileno(), util.stderr.fileno())
 
-        @atexit.register
+        @self.atexit
         def killpager():
             if util.safehasattr(signal, "SIGINT"):
                 signal.signal(signal.SIGINT, signal.SIG_IGN)