Index: configure
===================================================================
--- configure	(revisione 87518)
+++ configure	(copia locale)
@@ -9248,7 +9248,7 @@
  putenv readlink realpath \
  select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
  setgid \
- setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
+ setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
  sigaction siginterrupt sigrelse snprintf strftime strlcpy \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv utimes waitpid wait3 wait4 \
Index: configure.in
===================================================================
--- configure.in	(revisione 87518)
+++ configure.in	(copia locale)
@@ -2533,7 +2533,7 @@
  putenv readlink realpath \
  select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
  setgid \
- setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
+ setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
  sigaction siginterrupt sigrelse snprintf strftime strlcpy \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv utimes waitpid wait3 wait4 \
Index: Doc/library/os.rst
===================================================================
--- Doc/library/os.rst	(revisione 87518)
+++ Doc/library/os.rst	(copia locale)
@@ -285,6 +285,22 @@
 
    .. versionchanged:: 3.2
       Added support for Windows.
+      
+.. function:: getpriority(which, who)
+
+   .. index:: single: process; scheduling priority
+
+   Get program scheduling priority. The value *which* is one of 
+   :const:`PRIO_PROCESS`, :const:`PRIO_PGRP`, or :const:`PRIO_USER`, and *who* 
+   is interpreted relative to *which* (a process identifier for 
+   :const:`PRIO_PROCESS`, process group identifier for :const:`PRIO_PGRP`, and a 
+   user ID for :const:`PRIO_USER`). A zero value for *who* denotes 
+   (respectively) the calling process, the process group of the calling process, 
+   or the real user ID of the calling process.
+
+   Availability: Unix
+
+   .. versionadded:: 3.3
 
 .. function:: getresuid()
 
@@ -336,6 +352,15 @@
 
    .. versionadded:: 3.2
 
+.. data:: PRIO_PROCESS
+          PRIO_PGRP
+          PRIO_USER
+
+   Parameters for :func:`getpriority` and :func:`setpriority` functions. 
+   
+   Availability: Unix.
+
+   .. versionadded:: 3.3
 
 .. function:: putenv(key, value)
 
@@ -405,6 +430,25 @@
    Availability: Unix.
 
 
+.. function:: setpriority(which, who, priority)
+
+   .. index:: single: process; scheduling priority
+
+   Set program scheduling priority. The value *which* is one of 
+   :const:`PRIO_PROCESS`, :const:`PRIO_PGRP`, or :const:`PRIO_USER`, and *who* 
+   is interpreted relative to *which* (a process identifier for 
+   :const:`PRIO_PROCESS`, process group identifier for :const:`PRIO_PGRP`, and a 
+   user ID for :const:`PRIO_USER`). A zero value for *who* denotes 
+   (respectively) the calling process, the process group of the calling process, 
+   or the real user ID of the calling process.
+   *priority* is a value in the range -20 to 19. The default priority is 0; 
+   lower priorities cause more favorable scheduling.
+
+   Availability: Unix
+
+   .. versionadded:: 3.3
+
+
 .. function:: setregid(rgid, egid)
 
    Set the current process's real and effective group ids.
Index: Lib/test/test_os.py
===================================================================
--- Lib/test/test_os.py	(revisione 87518)
+++ Lib/test/test_os.py	(copia locale)
@@ -1254,6 +1254,20 @@
     def test_getlogin(self):
         user_name = os.getlogin()
         self.assertNotEqual(len(user_name), 0)
+        
+
+@unittest.skipUnless(hasattr(os, 'getpriority') and hasattr(os, 'setpriority'),
+                     "needs os.getpriority and os.setpriority")
+class ProgramPriorityTests(unittest.TestCase):
+    """Tests for os.getpriority() and os.setpriority()."""
+
+    def test_set_get_priority(self):
+        base = os.getpriority(os.PRIO_PROCESS, os.getpid())
+        os.setpriority(os.PRIO_PROCESS, os.getpid(), base + 1)
+        try:
+            self.assertEqual(os.getpriority(os.PRIO_PROCESS, os.getpid()), base + 1)
+        finally:
+            os.setpriority(os.PRIO_PROCESS, os.getpid(), base)
 
 
 def test_main():
@@ -1276,6 +1290,7 @@
         PidTests,
         LoginTests,
         LinkTests,
+        ProgramPriorityTests,
     )
 
 if __name__ == "__main__":
Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revisione 87518)
+++ Modules/posixmodule.c	(copia locale)
@@ -2928,6 +2928,49 @@
 }
 #endif /* HAVE_NICE */
 
+
+#ifdef HAVE_GETPRIORITY
+PyDoc_STRVAR(posix_getpriority__doc__,
+"getpriority(which, who) -> current_priority\n\n\
+Get program scheduling priority.");
+
+static PyObject *
+posix_getpriority(PyObject *self, PyObject *args)
+{
+    int which, who, retval;
+
+    if (!PyArg_ParseTuple(args, "ii", &which, &who))
+        return NULL;
+    errno = 0;
+    retval = getpriority(which, who);
+    if (errno != 0)
+        return posix_error();
+    return PyLong_FromLong((long)retval);
+}
+#endif /* HAVE_GETPRIORITY */
+
+
+#ifdef HAVE_SETPRIORITY
+PyDoc_STRVAR(posix_setpriority__doc__,
+"setpriority(which, who, prio) -> None\n\n\
+Set program scheduling priority.");
+
+static PyObject *
+posix_setpriority(PyObject *self, PyObject *args)
+{
+    int which, who, prio, retval;
+
+    if (!PyArg_ParseTuple(args, "iii", &which, &who, &prio))
+        return NULL;
+    retval = setpriority(which, who, prio);
+    if (retval == -1)
+        return posix_error();
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+#endif /* HAVE_SETPRIORITY */
+
+
 PyDoc_STRVAR(posix_rename__doc__,
 "rename(old, new)\n\n\
 Rename a file or directory.");
@@ -7787,6 +7830,12 @@
 #ifdef HAVE_NICE
     {"nice",            posix_nice, METH_VARARGS, posix_nice__doc__},
 #endif /* HAVE_NICE */
+#ifdef HAVE_GETPRIORITY
+    {"getpriority",     posix_getpriority, METH_VARARGS, posix_getpriority__doc__},
+#endif /* HAVE_GETPRIORITY */
+#ifdef HAVE_SETPRIORITY
+    {"setpriority",     posix_setpriority, METH_VARARGS, posix_setpriority__doc__},
+#endif /* HAVE_SETPRIORITY */
 #ifdef HAVE_READLINK
     {"readlink",        posix_readlink, METH_VARARGS, posix_readlink__doc__},
 #endif /* HAVE_READLINK */
@@ -8241,6 +8290,16 @@
 #ifdef O_EXLOCK
     if (ins(d, "O_EXLOCK", (long)O_EXLOCK)) return -1;
 #endif
+#ifdef PRIO_PROCESS
+    if (ins(d, "PRIO_PROCESS", (long)PRIO_PROCESS)) return -1;
+#endif
+#ifdef PRIO_PGRP
+    if (ins(d, "PRIO_PGRP", (long)PRIO_PGRP)) return -1;
+#endif
+#ifdef PRIO_USER
+    if (ins(d, "PRIO_USER", (long)PRIO_USER)) return -1;
+#endif
+
 
 /* MS Windows */
 #ifdef O_NOINHERIT
Index: pyconfig.h.in
===================================================================
--- pyconfig.h.in	(revisione 87518)
+++ pyconfig.h.in	(copia locale)
@@ -599,6 +599,9 @@
 /* Define to 1 if you have the `setpgrp' function. */
 #undef HAVE_SETPGRP
 
+/* Define to 1 if you have the `setpriority' function. */
+#undef HAVE_SETPRIORITY
+
 /* Define to 1 if you have the `setregid' function. */
 #undef HAVE_SETREGID