* thread_pthread.c (ruby_init_stack): ignore `STACK_END_ADDRESS'

  if Ruby interpreter is running on co-routine.
  [Feature #2294]
  https://bugs.ruby-lang.org/issues/2294#note-18



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38905 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 21 insertions, 0 deletions

diff --git a/thread_pthread.c b/thread_pthread.c
index 6c48224a87..6e5f53fa67 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -643,6 +643,27 @@ ruby_init_stack(volatile VALUE *addr
 	native_main_thread.stack_maxsize = space;
 #endif
     }
+
+    /* If addr is out of range of main-thread stack range estimation,  */
+    /* it should be on co-routine (alternative stack). [Feature #2294] */
+    {
+	void *start, *end;
+
+	if (IS_STACK_DIR_UPPER()) {
+	    start = native_main_thread.stack_start;
+	    end = (char *)native_main_thread.stack_start + native_main_thread.stack_maxsize;
+	}
+	else {
+	    start = (char *)native_main_thread.stack_start - native_main_thread.stack_maxsize;
+	    end = native_main_thread.stack_start;
+	}
+
+	if ((void *)addr < start || (void *)addr > end) {
+	    /* out of range */
+	    native_main_thread.stack_start = (VALUE *)addr;
+	    native_main_thread.stack_maxsize = 0; /* unknown */
+	}
+    }
 }
 
 #define CHECK_ERR(expr) \