http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/libguile/fluids.h

/* classes: h_files */ #ifndef FLUIDSH #define FLUIDSH /* 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. */ #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); #if SCM_DEBUG_DEPRECATED == 0 /* Use scm_c_with_fluids instead. */ SCM scm_internal_with_fluids (SCM fluids, SCM vals, SCM (*cproc)(void *), void *cdata); #endif #endif /* !FLUIDSH */ /* Local Variables: c-file-style: "gnu" End: */