From: Ivan Maidanski <ivmai@mail.ru>
Date: Thu, 22 Nov 2012 04:39:20 +0000 (+0400)
Subject: Prevent POSIX fork if mprotect_thread is started (Darwin)
X-Git-Tag: gc7_4_0~139
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=37d8fb73e7210509bdc5f3e69b1ec5f8dcc6bda0;p=gc

Prevent POSIX fork if mprotect_thread is started (Darwin)

* pthread_support.c (GC_atfork_prepare): Abort if GC_dirty_maintained
is set for Darwin (only if MPROTECT_VDB) since graceful suspend/resume
of mprotect_thread is unsupported at present.
---

diff --git a/pthread_support.c b/pthread_support.c
index f270b59e..c65ecfab 100644
--- a/pthread_support.c
+++ b/pthread_support.c
@@ -996,6 +996,12 @@ static void fork_child_proc(void)
   /* Routines for fork handling by client (no-op if pthread_atfork works). */
   GC_API void GC_CALL GC_atfork_prepare(void)
   {
+#   if defined(GC_DARWIN_THREADS) && defined(MPROTECT_VDB)
+      if (GC_dirty_maintained) {
+        GC_ASSERT(0 == GC_handle_fork);
+        ABORT("Unable to fork while mprotect_thread is running");
+      }
+#   endif
     if (GC_handle_fork <= 0)
       fork_prepare_proc();
   }