upstream/mercurial-mirror Files · contrib/memory.py

osutil: add a function to unblock signals...

osutil: add a function to unblock signals Signals could be blocked by something like: #include <unistd.h> #include <signal.h> int main(int argc, char * const argv[]) { sigset_t set; sigfillset(&set); sigprocmask(SIG_BLOCK, &set, NULL); execv("/bin/hg", argv); return 0; } One of the problems is if SIGCHLD is blocked, chgserver would not reap zombie workers since it depends on SIGCHLD handler entirely. While it's the parent process to blame but it seems a good idea to just unblock the signal from hg. FWIW git does that for SIGPIPE already [1]. Unfortunately Python 2 does not reset or provide APIs to change signal masks. Therefore let's add one in osutil. Note: Python 3.3 introduced `signal.pthread_sigmask` which solves the problem. `sigprocmask` is part of POSIX [2] so there is no feature testing in `setup.py`. [1]: https://github.com/git/git/commit/7559a1be8a0afb10df41d25e4cf4c5285a5faef1 [2]: http://pubs.opengroup.org/onlinepubs/7908799/xsh/sigprocmask.html Differential Revision: https://phab.mercurial-scm.org/D1736

Bryan O'Sullivan - - Load All Authors

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      # memory.py - track memory usage

      #

      # Copyright 2009 Matt Mackall <mpm@selenic.com> and others

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      '''helper extension to measure memory usage

      Reads current and peak memory usage from ``/proc/self/status`` and

      prints it to ``stderr`` on exit.

      '''

      from __future__ import absolute_import

      def memusage(ui):

          """Report memory usage of the current process."""

          result = {'peak': 0, 'rss': 0}

          with open('/proc/self/status', 'r') as status:

              # This will only work on systems with a /proc file system

              # (like Linux).

              for line in status:

                  parts = line.split()

                  key = parts[0][2:-1].lower()

                  if key in result:

                      result[key] = int(parts[1])

          ui.write_err(", ".join(["%s: %.1f MiB" % (k, v / 1024.0)

                                  for k, v in result.iteritems()]) + "\n")

      def extsetup(ui):

          ui.atexit(memusage, ui)

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				# memory.py - track memory usage
				#
				# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				'''helper extension to measure memory usage

				Reads current and peak memory usage from ``/proc/self/status`` and
				prints it to ``stderr`` on exit.
				'''

				from __future__ import absolute_import

				def memusage(ui):
				"""Report memory usage of the current process."""
				result = {'peak': 0, 'rss': 0}
				with open('/proc/self/status', 'r') as status:
				# This will only work on systems with a /proc file system
				# (like Linux).
				for line in status:
				parts = line.split()
				key = parts[0][2:-1].lower()
				if key in result:
				result[key] = int(parts[1])
				ui.write_err(", ".join(["%s: %.1f MiB" % (k, v / 1024.0)
				for k, v in result.iteritems()]) + "\n")

				def extsetup(ui):
				ui.atexit(memusage, ui)