Use rb_execution_context_t instead of rb_thread_t

to represent execution context [Feature #14038]

* vm_core.h (rb_thread_t): rb_thread_t::ec is now a pointer.
  There are many code using `th` to represent execution context
  (such as cfp, VM stack and so on). To access `ec`, they need to
  use `th->ec->...` (adding one indirection) so that we need to
  replace them by passing `ec` instead of `th`.

* vm_core.h (GET_EC()): introduced to access current ec. Also
  remove `ruby_current_thread` global variable.

* cont.c (rb_context_t): introduce rb_context_t::thread_ptr instead of
  rb_context_t::thread_value.

* cont.c (ec_set_vm_stack): added to update vm_stack explicitly.

* cont.c (ec_switch): added to switch ec explicitly.

* cont.c (rb_fiber_close): added to terminate fibers explicitly.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60440 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 4 deletions

diff --git a/signal.c b/signal.c
index 78e31e92b0..3aaa988c25 100644
--- a/signal.c
+++ b/signal.c
@@ -838,13 +838,13 @@ check_stack_overflow(int sig, const uintptr_t addr, const ucontext_t *ctx)
      * the fault page can be the next. */
     if (sp_page == fault_page || sp_page == fault_page + 1 ||
 	sp_page <= fault_page && fault_page <= bp_page) {
-	rb_thread_t *th = ruby_current_thread;
+	rb_thread_t *th = ruby_current_thread();
 	int crit = FALSE;
-	if ((uintptr_t)th->ec.tag->buf / pagesize <= fault_page + 1) {
+	if ((uintptr_t)th->ec->tag->buf / pagesize <= fault_page + 1) {
 	    /* drop the last tag if it is close to the fault,
 	     * otherwise it can cause stack overflow again at the same
 	     * place. */
-	    th->ec.tag = th->ec.tag->prev;
+	    th->ec->tag = th->ec->tag->prev;
 	    crit = TRUE;
 	}
 	reset_sigmask(sig);
@@ -856,7 +856,7 @@ static void
 check_stack_overflow(int sig, const void *addr)
 {
     int ruby_stack_overflowed_p(const rb_thread_t *, const void *);
-    rb_thread_t *th = ruby_current_thread;
+    rb_thread_t *th = GET_THREAD();
     if (ruby_stack_overflowed_p(th, addr)) {
 	reset_sigmask(sig);
 	rb_threadptr_stack_overflow(th, FALSE);