Add atomic boxes

* doc/ref/api-scheduling.texi (Atomics): New manual section.
* libguile.h: Include atomic.h.
* libguile/Makefile.am (libguile_@GUILE_EFFECTIVE_VERSION@_la_SOURCES):
  (DOT_X_FILES, DOT_DOC_FILES, modinclude_HEADERS): Add atomic.
* libguile/atomic.c:
* libguile/atomic.h: New files.
* libguile/atomics-internal.h (scm_atomic_set_scm, scm_atomic_ref_scm)
  (scm_atomic_swap_scm, scm_atomic_compare_and_swap_scm): New
  facilities.
* libguile/goops.c (class_atomic_box, scm_sys_goops_early_init): Add
  support for <atomic-box>.  Remove duplicate <keyword> fetch.
* libguile/init.c (scm_i_init_guile): Call scm_register_atomic_box.
* libguile/print.c (iprin1): Add atomic box case.
* libguile/tags.h (scm_tc7_atomic_box): New tag.
* libguile/validate.h (SCM_VALIDATE_ATOMIC_BOX): New macro.
* module/Makefile.am (SOURCES): Add ice-9/atomic.scm.
* module/ice-9/atomic.scm: New file.
* module/oop/goops.scm (<atomic-box>): New var.

1 files changed, 56 insertions, 0 deletions

diff --git a/libguile/atomic.h b/libguile/atomic.h
new file mode 100644
index 000000000..9a33f8d1a
--- /dev/null
+++ b/libguile/atomic.h
@@ -0,0 +1,56 @@
+#ifndef SCM_ATOMIC_H
+#define SCM_ATOMIC_H
+
+/* Copyright (C) 2016 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+
+
+#include "libguile/__scm.h"
+#include "libguile/gc.h"
+#include "libguile/tags.h"
+
+
+
+static inline int
+scm_is_atomic_box (SCM obj)
+{
+  return SCM_HAS_TYP7 (obj, scm_tc7_atomic_box);
+}
+
+static inline SCM*
+scm_atomic_box_loc (SCM obj)
+{
+  return SCM_CELL_OBJECT_LOC (obj, 1);
+}
+
+
+
+#ifdef BUILDING_LIBGUILE
+SCM_INTERNAL SCM scm_make_atomic_box (SCM init);
+SCM_INTERNAL SCM scm_atomic_box_p (SCM obj);
+SCM_INTERNAL SCM scm_atomic_box_ref (SCM box);
+SCM_INTERNAL SCM scm_atomic_box_set_x (SCM box, SCM val);
+SCM_INTERNAL SCM scm_atomic_box_swap_x (SCM box, SCM val);
+SCM_INTERNAL SCM scm_atomic_box_compare_and_swap_x (SCM box, SCM expected, SCM desired);
+SCM_INTERNAL void scm_i_atomic_box_print (SCM box, SCM port, scm_print_state *pstate);
+
+SCM_INTERNAL void scm_register_atomic (void);
+#endif  /* BUILDING_LIBGUILE */
+
+#endif  /* SCM_ATOMIC_H */