-/* classes: h_files */
-
-#ifndef SCM_FLUIDS_H
-#define SCM_FLUIDS_H
-
-/* Copyright (C) 1996,2000,2001 Free Software Foundation, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
-
-\f
-
-#include "libguile/__scm.h"
-#include "libguile/root.h"
-#include "libguile/vectors.h"
-
-/* Fluids.
-
- Fluids are objects of a certain type (a smob) that can hold one SCM
- value per dynamic root. That is, modifications to this value are
- only visible to code that executes within the same dynamic root as
- the modifying code. When a new dynamic root is constructed, it
- inherits the values from its parent. Because each thread executes
- in its own dynamic root, you can use fluids for thread local
- storage.
-
- Each fluid is identified by a small integer. This integer is used
- to index a vector that holds the values of all fluids. Each root
- has its own vector.
-
- Currently, you can't get rid a certain fluid if you don't use it
- any longer. The slot that has been allocated for it in the fluid
- vector will not be reused for other fluids. Therefore, only use
- SCM_MAKE_FLUID or its Scheme variant `make-fluid' in initialization
- code that is only run once. Nevertheless, it should be possible to
- implement a more lightweight version of fluids on top of this basic
- mechanism. */
-
-extern scm_t_bits scm_tc16_fluid;
-
-#define SCM_FLUIDP(x) (!SCM_IMP (x) && (SCM_CELL_TYPE (x) == scm_tc16_fluid))
-#define SCM_FLUID_NUM(x) (SCM_CELL_WORD_1 (x))
-
-/* The fastest way to acces/modify the value of a fluid. These macros
-do no error checking at all. You should only use them when you know
-that the relevant fluid already exists in the current dynamic root.
-The easiest way to ensure this is to execute a SCM_FLUID_SET_X in the
-topmost root, for example right after SCM_MAKE_FLUID in your
-SCM_INIT_MUMBLE routine that gets called from SCM_BOOT_GUILE_1. The
-first argument is the index number of the fluid, obtained via
-SCM_FLUID_NUM, not the fluid itself. */
-
-#define SCM_FAST_FLUID_REF(n) (SCM_VELTS(scm_root->fluids)[n])
-#define SCM_FAST_FLUID_SET_X(n, val) (SCM_VELTS(scm_root->fluids)[n] = val)
-
-SCM scm_make_fluid (void);
-SCM scm_fluid_p (SCM fl);
-SCM scm_fluid_ref (SCM fluid);
-SCM scm_fluid_set_x (SCM fluid, SCM value);
-
-SCM scm_c_with_fluids (SCM fluids, SCM vals,
- SCM (*cproc)(void *), void *cdata);
-SCM scm_c_with_fluid (SCM fluid, SCM val,
- SCM (*cproc)(void *), void *cdata);
-SCM scm_with_fluids (SCM fluids, SCM vals, SCM thunk);
-
-SCM scm_make_initial_fluids (void);
-void scm_copy_fluids (scm_root_state *);
-void scm_swap_fluids (SCM fluids, SCM vals);
-void scm_swap_fluids_reverse (SCM fluids, SCM vals);
-
-void scm_init_fluids (void);
-
-#endif /* SCM_FLUIDS_H */
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* classes: h_files */
+
+#ifndef SCM_FLUIDS_H
+#define SCM_FLUIDS_H
+
+/* Copyright (C) 1996,2000,2001, 2006, 2008, 2009, 2010, 2011 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
+ */
+
+\f
+
+#include "libguile/__scm.h"
+#include "libguile/root.h"
+#include "libguile/vectors.h"
+
+/* These "with-fluids" objects live on the dynamic stack, and record previous
+ values of fluids. Guile uses shallow binding, so the current fluid values are
+ always in the same place for a given thread, in the dynamic-state vector.
+ */
+
+#define SCM_WITH_FLUIDS_P(x) (!SCM_IMP (x) && SCM_TYP7(x) == scm_tc7_with_fluids)
+#define SCM_WITH_FLUIDS_LEN(x) (SCM_CELL_WORD ((x), 0) >> 8)
+#define SCM_WITH_FLUIDS_NTH_FLUID(x,n) (SCM_CELL_OBJECT ((x), 1 + (n)*2))
+#define SCM_WITH_FLUIDS_NTH_VAL(x,n) (SCM_CELL_OBJECT ((x), 2 + (n)*2))
+#define SCM_WITH_FLUIDS_SET_NTH_VAL(x,n,v) (SCM_SET_CELL_OBJECT ((x), 2 + (n)*2, (v)))
+
+
+/* Fluids.
+
+ Fluids are objects of a certain type that can hold one SCM value per
+ dynamic state. That is, modifications to this value are only visible
+ to code that executes with the same dynamic state as the modifying
+ code. When a new dynamic state is constructed, it inherits the
+ values from its parent. Because each thread executes with its own
+ dynamic state, you can use fluids for thread local storage.
+
+ Each fluid is identified by a small integer. This integer is used to
+ index a vector that holds the values of all fluids. A dynamic state
+ consists of this vector, wrapped in an object so that the vector can
+ grow.
+ */
+
+#define SCM_FLUID_P(x) (!SCM_IMP (x) && SCM_TYP7 (x) == scm_tc7_fluid)
+#ifdef BUILDING_LIBGUILE
+#define SCM_I_FLUID_NUM(x) ((size_t)(SCM_CELL_WORD_0 (x) >> 8))
+#define SCM_I_FLUID_DEFAULT(x) (SCM_CELL_OBJECT_1 (x))
+#endif
+
+SCM_API SCM scm_make_fluid (void);
+SCM_API SCM scm_make_fluid_with_default (SCM dflt);
+SCM_API SCM scm_make_unbound_fluid (void);
+SCM_API int scm_is_fluid (SCM obj);
+SCM_API SCM scm_fluid_p (SCM fl);
+SCM_API SCM scm_fluid_ref (SCM fluid);
+SCM_API SCM scm_fluid_set_x (SCM fluid, SCM value);
+SCM_API SCM scm_fluid_unset_x (SCM fluid);
+SCM_API SCM scm_fluid_bound_p (SCM fluid);
+
+SCM_INTERNAL SCM scm_i_make_with_fluids (size_t n, SCM *fluids, SCM *vals);
+SCM_INTERNAL void scm_i_swap_with_fluids (SCM with_fluids, SCM dynamic_state);
+
+SCM_API SCM scm_c_with_fluids (SCM fluids, SCM vals,
+ SCM (*cproc)(void *), void *cdata);
+SCM_API SCM scm_c_with_fluid (SCM fluid, SCM val,
+ SCM (*cproc)(void *), void *cdata);
+SCM_API SCM scm_with_fluids (SCM fluids, SCM vals, SCM thunk);
+SCM_API SCM scm_with_fluid (SCM fluid, SCM val, SCM thunk);
+
+SCM_API void scm_dynwind_fluid (SCM fluid, SCM value);
+
+#ifdef BUILDING_LIBGUILE
+#define SCM_I_DYNAMIC_STATE_P(x) (!SCM_IMP (x) && SCM_TYP7 (x) == scm_tc7_dynamic_state)
+#define SCM_I_DYNAMIC_STATE_FLUIDS(x) SCM_PACK (SCM_CELL_WORD_1 (x))
+#endif
+
+SCM_API SCM scm_make_dynamic_state (SCM parent);
+SCM_API SCM scm_dynamic_state_p (SCM obj);
+SCM_API int scm_is_dynamic_state (SCM obj);
+SCM_API SCM scm_current_dynamic_state (void);
+SCM_API SCM scm_set_current_dynamic_state (SCM state);
+SCM_API void scm_dynwind_current_dynamic_state (SCM state);
+SCM_API void *scm_c_with_dynamic_state (SCM state,
+ void *(*func)(void *), void *data);
+SCM_API SCM scm_with_dynamic_state (SCM state, SCM proc);
+
+SCM_INTERNAL SCM scm_i_make_initial_dynamic_state (void);
+
+SCM_INTERNAL void scm_i_fluid_print (SCM exp, SCM port, scm_print_state *pstate);
+SCM_INTERNAL void scm_i_dynamic_state_print (SCM exp, SCM port, scm_print_state *pstate);
+SCM_INTERNAL void scm_i_with_fluids_print (SCM exp, SCM port, scm_print_state *pstate);
+SCM_INTERNAL void scm_init_fluids (void);
+
+#endif /* SCM_FLUIDS_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff