mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-06-10 22:10:21 +02:00
*** empty log message ***
This commit is contained in:
Marius Vollmer
parent
7f47d2d877
commit
9482a297ec
2 changed files with 287 additions and 0 deletions
188
libguile/fluids.c
Normal file
188
libguile/fluids.c
Normal file
|
|
@ -0,0 +1,188 @@
|
|||
/* Copyright (C) 1996 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 <assert.h>
|
||||
|
||||
#include "_scm.h"
|
||||
#include "print.h"
|
||||
#include "smob.h"
|
||||
#include "fluids.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, 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;
|
||||
assert (SCM_NIMP (old_fluids) && SCM_VECTORP (old_fluids));
|
||||
old_length = SCM_LENGTH (old_fluids);
|
||||
assert (old_length <= new_length);
|
||||
new_fluids = scm_make_vector (SCM_MAKINUM (new_length),
|
||||
SCM_BOOL_F, 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_gen_puts (scm_regular_string, "#<fluid ", port);
|
||||
scm_intprint (SCM_FLUID_NUM (exp), 10, port);
|
||||
scm_gen_putc ('>', port);
|
||||
return 1;
|
||||
}
|
||||
|
||||
static scm_smobfuns fluid_smob = {
|
||||
scm_mark0,
|
||||
scm_free0,
|
||||
print_fluid
|
||||
};
|
||||
|
||||
static
|
||||
int next_fluid_num ()
|
||||
{
|
||||
int n;
|
||||
SCM_THREAD_CRITICAL_SECTION_START;
|
||||
n = n_fluids++;
|
||||
SCM_THREAD_CRITICAL_SECTION_END;
|
||||
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_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), SCM_ARG1, fl, s_fluid_ref);
|
||||
|
||||
n = SCM_FLUID_NUM (fl);
|
||||
assert (n >= 0 && n < n_fluids);
|
||||
|
||||
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), SCM_ARG1, fl, s_fluid_set_x);
|
||||
|
||||
n = SCM_FLUID_NUM (fl);
|
||||
assert (n >= 0 && n < n_fluids);
|
||||
|
||||
if (SCM_LENGTH (scm_root->fluids) <= n)
|
||||
grow_fluids (scm_root, n+1);
|
||||
SCM_VELTS(scm_root->fluids)[n] = val;
|
||||
return val;
|
||||
}
|
||||
|
||||
void
|
||||
scm_init_fluids ()
|
||||
{
|
||||
scm_tc16_fluid = scm_newsmob(&fluid_smob);
|
||||
#include "fluids.x"
|
||||
}
|
||||
99
libguile/fluids.h
Normal file
99
libguile/fluids.h
Normal file
|
|
@ -0,0 +1,99 @@
|
|||
/* classes: h_files */
|
||||
|
||||
#ifndef FLUIDSH
|
||||
#define FLUIDSH
|
||||
|
||||
/* Copyright (C) 1996 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 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 it 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 long scm_tc16_fluid;
|
||||
|
||||
#define SCM_FLUIDP(x) (SCM_CAR(x) == scm_tc16_fluid)
|
||||
#define SCM_FLUID_NUM(x) SCM_CDR(x)
|
||||
|
||||
/* The fastest way to acces/modify the value of a fluid. These macros
|
||||
does 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 SCM_P ((void));
|
||||
SCM scm_fluid_ref SCM_P ((SCM fluid));
|
||||
SCM scm_fluid_set_x SCM_P ((SCM fluid, SCM value));
|
||||
|
||||
SCM scm_make_initial_fluids SCM_P ((void));
|
||||
void scm_copy_fluids SCM_P ((scm_root_state *));
|
||||
|
||||
void scm_init_fluids SCM_P ((void));
|
||||
|
||||
#endif /* !FLUIDSH */
|
||||
Loading…
Add table
Add a link
Reference in a new issue