process.c: try to workaroun SEGV by r65994

http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/1480173

It tries to print C backtrace but fails. And core file on the server
seems to be stopping on the irrelevant place due to its own signal
handler for the dump.

And I failed to reproduce this SEGV on my machine.

I don't know why it's broken, so let me try this change to investigate
the reason of SEGV.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65997 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 24 insertions, 13 deletions

diff --git a/mjit.c b/mjit.c
index 5fa93a3cfa..f7ae80834f 100644
--- a/mjit.c
+++ b/mjit.c
@@ -785,6 +785,29 @@ mjit_child_after_fork(void)
     start_worker();
 }
 
+/* Half-baked version of mjit_finish(). It just deletes MJIT-related files.
+   Caller should disable MJIT because it won't work without the deleted files.
+
+   We want to use mjit_finish() for this function's usage but it's somehow broken like:
+   http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/1480173 */
+void
+mjit_clean_files(void)
+{
+#ifndef _MSC_VER /* mswin has prebuilt precompiled header */
+    if (!mjit_opts.save_temps && getpid() == pch_owner_pid)
+        remove_file(pch_file);
+
+    xfree(header_file); header_file = NULL;
+#endif
+    xfree(tmp_dir); tmp_dir = NULL;
+    xfree(pch_file); pch_file = NULL;
+
+    mjit_call_p = FALSE;
+    free_list(&unit_queue);
+    free_list(&active_units);
+    free_list(&compact_units);
+}
+
 /* Finish the threads processing units and creating PCH, finalize
    and free MJIT data.  It should be called last during MJIT
    life.  */
@@ -817,19 +840,7 @@ mjit_finish(void)
     rb_native_cond_destroy(&mjit_worker_wakeup);
     rb_native_cond_destroy(&mjit_gc_wakeup);
 
-#ifndef _MSC_VER /* mswin has prebuilt precompiled header */
-    if (!mjit_opts.save_temps && getpid() == pch_owner_pid)
-        remove_file(pch_file);
-
-    xfree(header_file); header_file = NULL;
-#endif
-    xfree(tmp_dir); tmp_dir = NULL;
-    xfree(pch_file); pch_file = NULL;
-
-    mjit_call_p = FALSE;
-    free_list(&unit_queue);
-    free_list(&active_units);
-    free_list(&compact_units);
+    mjit_clean_files();
     finish_conts();
 
     mjit_enabled = FALSE;