Issue 10784: adds os.getpriority() and os.setpriority() functions.

Doc/library/os.rst

@@ -286,6 +286,22 @@ process and user.
    .. 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()
 
    Return a tuple (ruid, euid, suid) denoting the current process's
@@ -336,6 +352,15 @@ process and user.
 
    .. 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 @@ process and user.
    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.

Doc/whatsnew/3.3.rst

@@ -71,16 +71,22 @@ New, Improved, and Deprecated Modules
 os
 --
 
-The :mod:`os` module has a new :func:`~os.sendfile` function which provides an
-efficent "zero-copy" way for copying data from one file (or socket) descriptor
-to another.
-The phrase "zero-copy" refers to the fact that all of the copying of data
-between the two descriptors is done entirely by the kernel, with no copying of
-data into userspace buffers.
-:func:`~os.sendfile` can be used to efficiently copy data from a file on disk to
-a network socket, e.g. for downloading a file.
+* The :mod:`os` module has a new :func:`~os.sendfile` function which provides
+  an efficent "zero-copy" way for copying data from one file (or socket)
+  descriptor to another. The phrase "zero-copy" refers to the fact that all of
+  the copying of data between the two descriptors is done entirely by the
+  kernel, with no copying of data into userspace buffers. :func:`~os.sendfile`
+  can be used to efficiently copy data from a file on disk to a network socket,
+  e.g. for downloading a file.
 
-(Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.)
+  (Patch submitted by Ross Lagerwall and Giampaolo Rodolà in :issue:`10882`.)
+
+* The :mod:`os` module has two new functions: :func:`~os.getpriority` and
+  :func:`~os.setpriority`. They can be used to get or set process
+  niceness/priority in a fashion similar to :func:`os.nice` but extended to all
+  processes instead of just the current one.
+
+  (Patch submitted by Giampaolo Rodolà in :issue:`10784`.)
 
 Optimizations
 =============