From 4a43ae5779424e8b175cfc8d0671378d68afbe9c Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Tue, 27 Jun 2023 10:17:58 +0100
Subject: [PATCH] ocaml: Replace old enter/leave_blocking_section calls

Since OCaml 4 the old and confusing caml_enter_blocking_section and
caml_leave_blocking_section calls have been replaced with
caml_release_runtime_system and caml_acquire_runtime_system (in that
order).  Use the new names.

(cherry picked from commit 7e1d7c1330185a1f3da2ce2100f59637518c3302)
---
 generator/OCaml.ml | 5 +++--
 ocaml/guestfs-c.c  | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/generator/OCaml.ml b/generator/OCaml.ml
index 02d9ee2e..07ccd269 100644
--- a/generator/OCaml.ml
+++ b/generator/OCaml.ml
@@ -429,6 +429,7 @@ and generate_ocaml_c () =
 #include <caml/memory.h>
 #include <caml/mlvalues.h>
 #include <caml/signals.h>
+#include <caml/threads.h>
 
 #include <guestfs.h>
 #include \"guestfs-utils.h\"
@@ -689,12 +690,12 @@ copy_table (char * const * argv)
       pr "\n";
 
       if blocking then
-        pr "  caml_enter_blocking_section ();\n";
+        pr "  caml_release_runtime_system ();\n";
       pr "  r = %s " c_function;
       generate_c_call_args ~handle:"g" style;
       pr ";\n";
       if blocking then
-        pr "  caml_leave_blocking_section ();\n";
+        pr "  caml_acquire_runtime_system ();\n";
 
       (* Free strings if we copied them above. *)
       List.iter (
diff --git a/ocaml/guestfs-c.c b/ocaml/guestfs-c.c
index 3888c945..8c8aa460 100644
--- a/ocaml/guestfs-c.c
+++ b/ocaml/guestfs-c.c
@@ -34,6 +34,7 @@
 #include <caml/mlvalues.h>
 #include <caml/printexc.h>
 #include <caml/signals.h>
+#include <caml/threads.h>
 #include <caml/unixsupport.h>
 
 #include "guestfs-c.h"
@@ -395,12 +396,12 @@ event_callback_wrapper (guestfs_h *g,
   /* Ensure we are holding the GC lock before any GC operations are
    * possible. (RHBZ#725824)
    */
-  caml_leave_blocking_section ();
+  caml_acquire_runtime_system ();
 
   event_callback_wrapper_locked (g, data, event, event_handle, flags,
                                  buf, buf_len, array, array_len);
 
-  caml_enter_blocking_section ();
+  caml_release_runtime_system ();
 }
 
 value