Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / futures.h

diff --git a/guile18/libguile/futures.h b/guile18/libguile/futures.h
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+++ b/guile18/libguile/futures.h
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+/* classes: h_files */
+
+#ifndef SCM_FUTURES_H
+#define SCM_FUTURES_H
+
+/* Copyright (C) 2002, 2003, 2006 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 2.1 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
+ */
+
+\f
+
+#if 0
+
+/* Futures have the following known bugs, which should be fixed before
+   including them in Guile:
+
+   - The implementation of the thread cache needs to be better so that
+     it behaves reasonable under heavy use.
+
+   - The dynamic state of a thread needs to be properly initialized
+     when it is retrieved from the cache.
+*/
+
+#include "libguile/__scm.h"
+#include "libguile/threads.h"
+
+\f
+
+typedef struct scm_t_future {
+  SCM data;
+  scm_i_pthread_mutex_t mutex;
+  scm_i_pthread_cond_t cond;
+  int status;
+  int die_p;
+} scm_t_future;
+
+#define SCM_FUTURE_DEAD 0
+#define SCM_FUTURE_SIGNAL_ME -1
+#define SCM_FUTURE_COMPUTING 1
+#define SCM_FUTURE_TASK_ASSIGNED 2
+
+#define SCM_VALIDATE_FUTURE(pos, obj) \
+  SCM_ASSERT_TYPE (SCM_TYP16_PREDICATE (scm_tc16_future, obj), \
+                  obj, pos, FUNC_NAME, "future");
+#define SCM_FUTURE(future) ((scm_t_future *) SCM_SMOB_DATA_2 (future))
+#define SCM_FUTURE_MUTEX(future) (&SCM_FUTURE (future)->mutex)
+#define SCM_FUTURE_COND(future) (&SCM_FUTURE (future)->cond)
+#define SCM_FUTURE_STATUS(future) (SCM_FUTURE (future)->status)
+#define SCM_SET_FUTURE_STATUS(future, x) \
+ do { SCM_FUTURE (future)->status = (x); } while (0)
+#define SCM_FUTURE_ALIVE_P(future) (SCM_FUTURE_STATUS (future))
+#define SCM_FUTURE_DATA(future) (SCM_FUTURE (future)->data)
+#define SCM_SET_FUTURE_DATA(future, x) \
+ do { SCM_FUTURE (future)->data = (x); } while (0)
+#define SCM_FUTURE_NEXT       SCM_SMOB_OBJECT
+#define SCM_FUTURE_NEXTLOC    SCM_SMOB_OBJECT_LOC
+#define SCM_SET_FUTURE_NEXT   SCM_SET_SMOB_OBJECT
+
+SCM_API scm_t_bits scm_tc16_future;
+
+extern SCM *scm_loc_sys_thread_handler;
+
+SCM_API SCM scm_i_make_future (SCM thunk);
+SCM_API SCM scm_make_future (SCM thunk);
+SCM_API SCM scm_future_ref (SCM future);
+
+void scm_init_futures (void);
+
+#endif  /* Futures are disabled for now. */
+
+#endif  /* SCM_FUTURES_H */
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/