From d4e2feddfb104d29e9b92043247b4e06b18312a4 Mon Sep 17 00:00:00 2001
From: Giampaolo Rodola <g.rodola@gmail.com>
Date: Sat, 8 Dec 2018 12:50:37 +0100
Subject: #1111 try to make Process.oneshot() thread safe

---
 psutil/__init__.py | 69 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 36 insertions(+), 33 deletions(-)

diff --git a/psutil/__init__.py b/psutil/__init__.py
index 5a5720d7..0eb19799 100644
--- a/psutil/__init__.py
+++ b/psutil/__init__.py
@@ -31,6 +31,7 @@ import os
 import signal
 import subprocess
 import sys
+import threading
 import time
 try:
     import pwd
@@ -360,6 +361,7 @@ class Process(object):
         self._proc = _psplatform.Process(pid)
         self._last_sys_cpu_times = None
         self._last_proc_cpu_times = None
+        self._lock = threading.RLock()
         # cache creation time for later use in is_running() method
         try:
             self.create_time()
@@ -456,40 +458,41 @@ class Process(object):
         ...
         >>>
         """
-        if self._oneshot_inctx:
-            # NOOP: this covers the use case where the user enters the
-            # context twice. Since as_dict() internally uses oneshot()
-            # I expect that the code below will be a pretty common
-            # "mistake" that the user will make, so let's guard
-            # against that:
-            #
-            # >>> with p.oneshot():
-            # ...    p.as_dict()
-            # ...
-            yield
-        else:
-            self._oneshot_inctx = True
-            try:
-                # cached in case cpu_percent() is used
-                self.cpu_times.cache_activate()
-                # cached in case memory_percent() is used
-                self.memory_info.cache_activate()
-                # cached in case parent() is used
-                self.ppid.cache_activate()
-                # cached in case username() is used
-                if POSIX:
-                    self.uids.cache_activate()
-                # specific implementation cache
-                self._proc.oneshot_enter()
+        with self._lock:
+            if self._oneshot_inctx:
+                # NOOP: this covers the use case where the user enters the
+                # context twice. Since as_dict() internally uses oneshot()
+                # I expect that the code below will be a pretty common
+                # "mistake" that the user will make, so let's guard
+                # against that:
+                #
+                # >>> with p.oneshot():
+                # ...    p.as_dict()
+                # ...
                 yield
-            finally:
-                self.cpu_times.cache_deactivate()
-                self.memory_info.cache_deactivate()
-                self.ppid.cache_deactivate()
-                if POSIX:
-                    self.uids.cache_deactivate()
-                self._proc.oneshot_exit()
-                self._oneshot_inctx = False
+            else:
+                self._oneshot_inctx = True
+                try:
+                    # cached in case cpu_percent() is used
+                    self.cpu_times.cache_activate()
+                    # cached in case memory_percent() is used
+                    self.memory_info.cache_activate()
+                    # cached in case parent() is used
+                    self.ppid.cache_activate()
+                    # cached in case username() is used
+                    if POSIX:
+                        self.uids.cache_activate()
+                    # specific implementation cache
+                    self._proc.oneshot_enter()
+                    yield
+                finally:
+                    self.cpu_times.cache_deactivate()
+                    self.memory_info.cache_deactivate()
+                    self.ppid.cache_deactivate()
+                    if POSIX:
+                        self.uids.cache_deactivate()
+                    self._proc.oneshot_exit()
+                    self._oneshot_inctx = False
 
     def as_dict(self, attrs=None, ad_value=None):
         """Utility method returning process information as a
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