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/* 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. */
#include "_scm.h"
#include "print.h"
#include "smob.h"
#include "dynwind.h"
#include "fluids.h"
#include "alist.h"
#include "eval.h"
#define INITIAL_FLUIDS 10
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_P ((scm_root_state *, int new_length));
static void
grow_fluids (root_state, new_length)
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 (root_state)
scm_root_state *root_state;
{
grow_fluids (root_state, SCM_LENGTH(root_state->fluids));
}
static int print_fluid SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
static int
print_fluid (exp, port, pstate)
SCM exp;
SCM port;
scm_print_state *pstate;
{
scm_puts ("#<fluid ", port);
scm_intprint (SCM_FLUID_NUM (exp), 10, port);
scm_putc ('>', port);
return 1;
}
static scm_smobfuns fluid_smob = {
0,
scm_free0,
print_fluid
};
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_PROC (s_make_fluid, "make-fluid", 0, 0, 0, scm_make_fluid);
SCM
scm_make_fluid ()
{
SCM z;
int n;
SCM_DEFER_INTS;
n = next_fluid_num ();
SCM_NEWCELL (z);
SCM_SETCAR (z, scm_tc16_fluid);
SCM_SETCDR (z, n);
SCM_ALLOW_INTS;
return z;
}
SCM_PROC (s_fluid_p, "fluid?", 1, 0, 0, scm_fluid_p);
SCM
scm_fluid_p (fl)
SCM fl;
{
return (SCM_NIMP (fl) && SCM_FLUIDP (fl))? SCM_BOOL_T : SCM_BOOL_F;
}
SCM_PROC (s_fluid_ref, "fluid-ref", 1, 0, 0, scm_fluid_ref);
SCM
scm_fluid_ref (fl)
SCM fl;
{
int n;
SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), fl, SCM_ARG1, s_fluid_ref);
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];
}
SCM_PROC (s_fluid_set_x, "fluid-set!", 2, 0, 0, scm_fluid_set_x);
SCM
scm_fluid_set_x (fl, val)
SCM fl;
SCM val;
{
int n;
SCM_ASSERT (SCM_NIMP (fl) && SCM_FLUIDP (fl), fl, SCM_ARG1, s_fluid_set_x);
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;
}
void
scm_swap_fluids (fluids, vals)
SCM fluids, 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 (fluids, vals)
SCM fluids, 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);
}
}
SCM_PROC (s_with_fluids, "with-fluids*", 3, 0, 0, scm_with_fluids);
SCM
scm_internal_with_fluids (fluids, vals, cproc, cdata)
SCM fluids, vals;
SCM (*cproc) ();
void *cdata;
{
SCM ans;
int flen = scm_ilength (fluids);
int vlen = scm_ilength (vals);
SCM_ASSERT (flen >= 0, fluids, SCM_ARG1, s_with_fluids);
SCM_ASSERT (vlen >= 0, vals, SCM_ARG2, s_with_fluids);
if (flen != vlen)
scm_out_of_range (s_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;
}
static SCM
apply_thunk (void *thunk)
{
return scm_apply ((SCM) thunk, SCM_EOL, SCM_EOL);
}
SCM
scm_with_fluids (fluids, vals, thunk)
SCM fluids, vals, thunk;
{
return scm_internal_with_fluids (fluids, vals, apply_thunk, (void *)thunk);
}
void
scm_init_fluids ()
{
scm_tc16_fluid = scm_newsmob(&fluid_smob);
#include "fluids.x"
}
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