/* Copyright (C) 1996, 1997 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. */ /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ #include "_scm.h" #include "print.h" #include "smob.h" #include "genio.h" #include "dynwind.h" #include "fluids.h" #include "alist.h" #include "eval.h" #define INITIAL_FLUIDS 10 #include "scm_validate.h" static volatile int n_fluids; long scm_tc16_fluid; SCM scm_make_initial_fluids () { return scm_make_vector (SCM_MAKINUM (INITIAL_FLUIDS), SCM_BOOL_F); } static void grow_fluids (scm_root_state *root_state,int new_length) { SCM old_fluids, new_fluids; int old_length, i; old_fluids = root_state->fluids; old_length = SCM_LENGTH (old_fluids); new_fluids = scm_make_vector (SCM_MAKINUM (new_length), SCM_BOOL_F); i = 0; while (i < old_length) { SCM_VELTS(new_fluids)[i] = SCM_VELTS(old_fluids)[i]; i++; } while (i < new_length) { SCM_VELTS(new_fluids)[i] = SCM_BOOL_F; i++; } root_state->fluids = new_fluids; } void scm_copy_fluids (scm_root_state *root_state) { grow_fluids (root_state, SCM_LENGTH(root_state->fluids)); } static int print_fluid (SCM exp, SCM port, scm_print_state *pstate) { scm_puts ("#', port); return 1; } static int next_fluid_num () { int n; #ifdef USE_THREADS SCM_THREAD_CRITICAL_SECTION_START; #endif n = n_fluids++; #ifdef USE_THREADS SCM_THREAD_CRITICAL_SECTION_END; #endif return n; } SCM_DEFINE (scm_make_fluid, "make-fluid", 0, 0, 0, (), "") #define FUNC_NAME s_scm_make_fluid { int n; SCM_DEFER_INTS; n = next_fluid_num (); SCM_RETURN_NEWSMOB (scm_tc16_fluid, n); } #undef FUNC_NAME SCM_DEFINE (scm_fluid_p, "fluid?", 1, 0, 0, (SCM fl), "") #define FUNC_NAME s_scm_fluid_p { return SCM_BOOL(SCM_FLUIDP (fl)); } #undef FUNC_NAME SCM_DEFINE (scm_fluid_ref, "fluid-ref", 1, 0, 0, (SCM fl), "") #define FUNC_NAME s_scm_fluid_ref { int n; SCM_VALIDATE_FLUID (1,fl); n = SCM_FLUID_NUM (fl); if (SCM_LENGTH (scm_root->fluids) <= n) grow_fluids (scm_root, n+1); return SCM_VELTS(scm_root->fluids)[n]; } #undef FUNC_NAME SCM_DEFINE (scm_fluid_set_x, "fluid-set!", 2, 0, 0, (SCM fl, SCM val), "") #define FUNC_NAME s_scm_fluid_set_x { int n; SCM_VALIDATE_FLUID (1,fl); n = SCM_FLUID_NUM (fl); if (SCM_LENGTH (scm_root->fluids) <= n) grow_fluids (scm_root, n+1); SCM_VELTS(scm_root->fluids)[n] = val; return val; } #undef FUNC_NAME void scm_swap_fluids (SCM fluids, SCM vals) { while (SCM_NIMP (fluids)) { SCM fl = SCM_CAR (fluids); SCM old_val = scm_fluid_ref (fl); scm_fluid_set_x (fl, SCM_CAR (vals)); SCM_SETCAR (vals, old_val); fluids = SCM_CDR (fluids); vals = SCM_CDR (vals); } } /* Swap the fluid values in reverse order. This is important when the same fluid appears multiple times in the fluids list. */ void scm_swap_fluids_reverse (SCM fluids, SCM vals) { if (SCM_NIMP (fluids)) { SCM fl, old_val; scm_swap_fluids_reverse (SCM_CDR (fluids), SCM_CDR (vals)); fl = SCM_CAR (fluids); old_val = scm_fluid_ref (fl); scm_fluid_set_x (fl, SCM_CAR (vals)); SCM_SETCAR (vals, old_val); } } static SCM apply_thunk (void *thunk) { return scm_apply ((SCM) thunk, SCM_EOL, SCM_EOL); } SCM_DEFINE (scm_with_fluids, "with-fluids*", 3, 0, 0, (SCM fluids, SCM vals, SCM thunk), "") #define FUNC_NAME s_scm_with_fluids { return scm_internal_with_fluids (fluids, vals, apply_thunk, (void *)thunk); } #undef FUNC_NAME SCM scm_internal_with_fluids (SCM fluids, SCM vals, SCM (*cproc) (), void *cdata) #define FUNC_NAME "scm_internal_with_fluids" { SCM ans; int flen, vlen; SCM_VALIDATE_LIST_COPYLEN (1, fluids, flen); SCM_VALIDATE_LIST_COPYLEN (2, vals, vlen); if (flen != vlen) scm_out_of_range (s_scm_with_fluids, vals); scm_swap_fluids (fluids, vals); scm_dynwinds = scm_acons (fluids, vals, scm_dynwinds); ans = cproc (cdata); scm_dynwinds = SCM_CDR (scm_dynwinds); scm_swap_fluids_reverse (fluids, vals); return ans; } #undef FUNC_NAME void scm_init_fluids () { scm_tc16_fluid = scm_make_smob_type_mfpe ("fluid", 0, NULL, NULL, print_fluid, NULL); #include "fluids.x" }