@@ -52,6 +52,18 @@ this module for those platforms.
    Constant used to represent the limit for an unlimited resource.
 
 
+.. data:: RLIM_SAVED_CUR
+.. data:: RLIM_SAVED_MAX
+
+   Constants used to represent the soft and hard limit values if they
+   cannot be represented in the ``rlim_t`` value in C.
+   On FreeBSD they are aliases of :data:`RLIM_INFINITY`.
+
+   .. availability:: Solaris, AIX, FreeBSD
+
+   .. versionadded:: next
+
+
 .. function:: getrlimit(resource)
 
    Returns a tuple ``(soft, hard)`` with the current soft and hard limits of
@@ -177,7 +189,7 @@ platform.
 
    The largest area of mapped memory which the process may occupy.
 
-   .. availability:: FreeBSD >= 11.
+   .. availability:: Solaris, FreeBSD.
 
 
 .. data:: RLIMIT_AS
@@ -230,6 +242,7 @@ platform.
 
    .. versionadded:: 3.4
 
+
 .. data:: RLIMIT_SBSIZE
 
    The maximum size (in bytes) of socket buffer usage for this user.
@@ -240,6 +253,7 @@ platform.
 
    .. versionadded:: 3.4
 
+
 .. data:: RLIMIT_SWAP
 
    The maximum size (in bytes) of the swap space that may be reserved or
@@ -249,18 +263,20 @@ platform.
    `tuning(7) <https://man.freebsd.org/cgi/man.cgi?query=tuning&sektion=7>`__
    for a complete description of this sysctl.
 
-   .. availability:: FreeBSD.
+   .. availability:: FreeBSD >= 8.
 
    .. versionadded:: 3.4
 
+
 .. data:: RLIMIT_NPTS
 
    The maximum number of pseudo-terminals created by this user id.
 
-   .. availability:: FreeBSD.
+   .. availability:: FreeBSD >= 8.
 
    .. versionadded:: 3.4
 
+
 .. data:: RLIMIT_KQUEUES
 
    The maximum number of kqueues this user id is allowed to create.
@@ -269,6 +285,36 @@ platform.
 
    .. versionadded:: 3.10
 
+
+.. data:: RLIMIT_NTHR
+
+   The maximum number of threads for this user id, not counting the main
+   and kernel threads.
+
+   .. availability:: NetBSD >= 7.0.
+
+   .. versionadded:: next
+
+
+.. data:: RLIMIT_THREADS
+
+   The maximum number of threads each process can create.
+
+   .. availability:: AIX.
+
+   .. versionadded:: next
+
+
+.. data:: RLIMIT_UMTXP
+
+   The limit of the number of process-shared Posix thread library objects
+   allocated by user id.
+
+   .. availability:: FreeBSD >= 11.
+
+   .. versionadded:: next
+
+
 Resource Usage
 --------------
 
 
@@ -277,6 +277,15 @@ os.path
   the resulting path can be missing but it will be free of symlinks.
   (Contributed by Petr Viktorin for :cve:`2025-4517`.)
 
+resource
+--------
+
+* Add new constants: :data:`~resource.RLIMIT_NTHR`,
+  :data:`~resource.RLIMIT_UMTXP`, :data:`~resource.RLIMIT_THREADS`,
+  :data:`~resource.RLIM_SAVED_CUR`, and :data:`~resource.RLIM_SAVED_MAX`.
+  (Contributed by Serhiy Storchaka in :gh:`137512`.)
+
+
 shelve
 ------
 
 
@@ -200,14 +200,23 @@ def test_pagesize(self):
         self.assertIsInstance(pagesize, int)
         self.assertGreaterEqual(pagesize, 0)
 
+    def test_contants(self):
+        self.assertIsInstance(resource.RLIM_INFINITY, int)
+        if sys.platform.startswith(('freebsd', 'solaris', 'sunos', 'aix')):
+            self.assertHasAttr(resource, 'RLIM_SAVED_CUR')
+            self.assertHasAttr(resource, 'RLIM_SAVED_MAX')
+        if hasattr(resource, 'RLIM_SAVED_CUR'):
+            self.assertIsInstance(resource.RLIM_SAVED_CUR, int)
+            self.assertIsInstance(resource.RLIM_SAVED_MAX, int)
+
     @unittest.skipUnless(sys.platform in ('linux', 'android'), 'Linux only')
     def test_linux_constants(self):
         for attr in ['MSGQUEUE', 'NICE', 'RTPRIO', 'RTTIME', 'SIGPENDING']:
             with contextlib.suppress(AttributeError):
                 self.assertIsInstance(getattr(resource, 'RLIMIT_' + attr), int)
 
     def test_freebsd_contants(self):
-        for attr in ['SWAP', 'SBSIZE', 'NPTS']:
+        for attr in ['SWAP', 'SBSIZE', 'NPTS', 'UMTXP', 'VMEM']:
             with contextlib.suppress(AttributeError):
                 self.assertIsInstance(getattr(resource, 'RLIMIT_' + attr), int)
 
 
@@ -0,0 +1,4 @@
+Add new constants in the :mod:`resource` module:
+:data:`~resource.RLIMIT_NTHR`, :data:`~resource.RLIMIT_UMTXP`,
+:data:`~resource.RLIMIT_THREADS`, :data:`~resource.RLIM_SAVED_CUR`, and
+:data:`~resource.RLIM_SAVED_MAX`.
@@ -518,9 +518,38 @@ resource_exec(PyObject *module)
     ADD_INT(module, RLIMIT_KQUEUES);
 #endif
 
+#ifdef RLIMIT_NTHR
+    ADD_INT(module, RLIMIT_NTHR);
+#endif
+
+#ifdef RLIMIT_THREADS
+    ADD_INT(module, RLIMIT_THREADS);
+#endif
+
+#ifdef RLIMIT_UMTXP
+    ADD_INT(module, RLIMIT_UMTXP);
+#endif
+
+#ifdef RLIMIT_PIPEBUF
+    ADD_INT(module, RLIMIT_PIPEBUF);
+#endif
+
     if (PyModule_Add(module, "RLIM_INFINITY", rlim2py(RLIM_INFINITY)) < 0) {
         return -1;
     }
+
+#ifdef RLIM_SAVED_CUR
+    if (PyModule_Add(module, "RLIM_SAVED_CUR", rlim2py(RLIM_SAVED_CUR)) < 0) {
+        return -1;
+    }
+#endif
+
+#ifdef RLIM_SAVED_MAX
+    if (PyModule_Add(module, "RLIM_SAVED_MAX", rlim2py(RLIM_SAVED_MAX)) < 0) {
+        return -1;
+    }
+#endif
+
     return 0;
 
 #undef ADD_INT