vm_trace.c: workqueue as thread-safe version of postponed_job

postponed_job is safe to use in signal handlers, but is not
thread-safe for MJIT.  Implement a workqueue for MJIT
thread-safety.

[Bug #15316]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66100 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index c557562e17..fd47aed804 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -638,12 +638,16 @@ typedef struct rb_vm_struct {
     /* relation table of ensure - rollback for callcc */
     struct st_table *ensure_rollback_table;
 
-    /* postponed_job */
+    /* postponed_job (async-signal-safe, NOT thread-safe) */
     struct rb_postponed_job_struct *postponed_job_buffer;
     int postponed_job_index;
 
     int src_encoding_index;
 
+    /* workqueue (thread-safe, NOT async-signal-safe) */
+    struct list_head workqueue; /* <=> rb_workqueue_job.jnode */
+    rb_nativethread_lock_t workqueue_lock;
+
     VALUE verbose, debug, orig_progname, progname;
     VALUE coverages;
     int coverage_mode;
@@ -1628,6 +1632,7 @@ rb_vm_living_threads_init(rb_vm_t *vm)
 {
     list_head_init(&vm->waiting_fds);
     list_head_init(&vm->waiting_pids);
+    list_head_init(&vm->workqueue);
     list_head_init(&vm->waiting_grps);
     list_head_init(&vm->living_threads);
     vm->living_thread_num = 0;