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/* Copyright (C) 1996,2000,2001, 2006 Free Software Foundation, Inc.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libguile/__scm.h"
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#include "libguile/root.h"
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#include "libguile/vectors.h"
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Fluids are objects of a certain type (a smob) that can hold one SCM
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value per dynamic state. That is, modifications to this value are
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only visible to code that executes with the same dynamic state as
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the modifying code. When a new dynamic state is constructed, it
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inherits the values from its parent. Because each thread executes
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with its own dynamic state, you can use fluids for thread local
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Each fluid is identified by a small integer. This integer is used
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to index a vector that holds the values of all fluids. A dynamic
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state consists of this vector, wrapped in a smob so that the vector
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/* The fastest way to acces/modify the value of a fluid. These macros
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do no error checking at all. The first argument is the index
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number of the fluid, obtained via SCM_FLUID_NUM, not the fluid
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itself. You must make sure that the fluid remains protected as
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long you use its number since numbers of unused fluids are reused
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#define SCM_FLUID_NUM(x) scm_i_fluid_num (x)
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#define SCM_FAST_FLUID_REF(n) scm_i_fast_fluid_ref (n)
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#define SCM_FAST_FLUID_SET_X(n, val) scm_i_fast_fluid_set_x ((n),(val))
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SCM_API SCM scm_make_fluid (void);
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SCM_API int scm_is_fluid (SCM obj);
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SCM_API SCM scm_fluid_p (SCM fl);
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SCM_API SCM scm_fluid_ref (SCM fluid);
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SCM_API SCM scm_fluid_set_x (SCM fluid, SCM value);
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SCM_API size_t scm_i_fluid_num (SCM fl);
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SCM_API SCM scm_i_fast_fluid_ref (size_t n);
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SCM_API void scm_i_fast_fluid_set_x (size_t n, SCM val);
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SCM_API SCM scm_c_with_fluids (SCM fluids, SCM vals,
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SCM (*cproc)(void *), void *cdata);
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SCM_API SCM scm_c_with_fluid (SCM fluid, SCM val,
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SCM (*cproc)(void *), void *cdata);
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SCM_API SCM scm_with_fluids (SCM fluids, SCM vals, SCM thunk);
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SCM_API SCM scm_with_fluid (SCM fluid, SCM val, SCM thunk);
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SCM_API void scm_dynwind_fluid (SCM fluid, SCM value);
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SCM_API SCM scm_make_dynamic_state (SCM parent);
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SCM_API SCM scm_dynamic_state_p (SCM obj);
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SCM_API int scm_is_dynamic_state (SCM obj);
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SCM_API SCM scm_current_dynamic_state (void);
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SCM_API SCM scm_set_current_dynamic_state (SCM state);
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SCM_API void scm_dynwind_current_dynamic_state (SCM state);
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SCM_API void *scm_c_with_dynamic_state (SCM state,
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void *(*func)(void *), void *data);
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SCM_API SCM scm_with_dynamic_state (SCM state, SCM proc);
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SCM_API SCM scm_i_make_initial_dynamic_state (void);
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SCM_API void scm_fluids_prehistory (void);
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SCM_API void scm_init_fluids (void);
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#endif /* SCM_FLUIDS_H */
added
removed
libguile/fluids.h
