From 0e62efc51e31c741b61604787aeab4936e6e50e4 Mon Sep 17 00:00:00 2001
From: David CARLIER <devnexen@gmail.com>
Date: Sat, 21 Nov 2020 11:39:56 +0000
Subject: [PATCH] bpo-42232: mmap module add Darwin specific madvise options.
 (GH-23076)

---
 Doc/library/mmap.rst                                      | 2 ++
 .../next/macOS/2020-11-01-15-10-28.bpo-42232.2zI1GN.rst   | 1 +
 Modules/mmapmodule.c                                      | 8 ++++++++
 3 files changed, 11 insertions(+)
 create mode 100644 Misc/NEWS.d/next/macOS/2020-11-01-15-10-28.bpo-42232.2zI1GN.rst

diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst
index 698c1765378..d9825b47c71 100644
--- a/Doc/library/mmap.rst
+++ b/Doc/library/mmap.rst
@@ -337,6 +337,8 @@ MADV_* Constants
           MADV_NOCORE
           MADV_CORE
           MADV_PROTECT
+          MADV_FREE_REUSABLE
+          MADV_FREE_REUSE
 
    These options can be passed to :meth:`mmap.madvise`.  Not every option will
    be present on every system.
diff --git a/Misc/NEWS.d/next/macOS/2020-11-01-15-10-28.bpo-42232.2zI1GN.rst b/Misc/NEWS.d/next/macOS/2020-11-01-15-10-28.bpo-42232.2zI1GN.rst
new file mode 100644
index 00000000000..d431a9d1e32
--- /dev/null
+++ b/Misc/NEWS.d/next/macOS/2020-11-01-15-10-28.bpo-42232.2zI1GN.rst
@@ -0,0 +1 @@
+Added Darwin specific madvise options to mmap module.
\ No newline at end of file
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 1e9684970f5..1e66962d37b 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1667,6 +1667,14 @@ mmap_exec(PyObject *module)
 #ifdef MADV_PROTECT
     ADD_INT_MACRO(module, MADV_PROTECT);
 #endif
+
+    // Darwin-specific
+#ifdef MADV_FREE_REUSABLE // (As MADV_FREE but reclaims more faithful for task_info/Activity Monitor...)
+    ADD_INT_MACRO(module, MADV_FREE_REUSABLE);
+#endif
+#ifdef MADV_FREE_REUSE // (Reuse pages previously tagged as reusable)
+    ADD_INT_MACRO(module, MADV_FREE_REUSE);
+#endif
 #endif // HAVE_MADVISE
     return 0;
 }