chx_running for GNU/Linux port.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

ChangeLog

@@ -1,3 +1,8 @@
+2019-11-20  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx-gnu-linux.c (chx_running): New.
+	(chx_init_arch): Set RUNNING.
+
 2019-11-19  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* chopstx-cortex-m.c (chx_running): New.

chopstx-gnu-linux.c

@@ -32,6 +32,14 @@
 #include <signal.h>
 #include <sys/time.h>
 
+static struct chx_thread *running;
+
+static struct chx_thread *
+chx_running (void)
+{
+  return running;
+}
+
 /* Data Memory Barrier.  */
 static void
 chx_dmb (void)
@@ -205,6 +213,8 @@ chx_init_arch (struct chx_thread *tp)
   makecontext (&idle_tc, idle, 0);
 
   getcontext (&tp->tc);
+
+  running = tp;
 }
 
 static void