-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997 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
*
* 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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.
*
* 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.
- */
+ * If you do not wish that, delete this exception notice. */
\f
#include <stdio.h>
#include <signal.h>
#include "_scm.h"
+#include "eval.h"
+#include "throw.h"
+#include "smob.h"
+
+#include "async.h"
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
*
*/
-
-#define min(A,B) ((A) < (B) ? (A) : (B))
-
+/* True between SCM_DEFER_INTS and SCM_ALLOW_INTS, and
+ * when the interpreter is not running at all.
+ */
+int scm_ints_disabled = 1;
unsigned int scm_async_clock = 20;
static unsigned int scm_async_rate = 20;
static unsigned int scm_switch_rate = 0;
static unsigned int scm_desired_switch_rate = 0;
-static SCM system_signal_asyncs[SCM_NUM_SIGS];
-static SCM handler_var;
-static SCM symbol_signal;
-
-
-struct scm_async
-{
- int got_it; /* needs to be delivered? */
- SCM thunk; /* the handler. */
-};
-
-
static long scm_tc16_async;
-#define SCM_ASYNCP(X) (scm_tc16_async == SCM_GCTYP16 (X))
-#define SCM_ASYNC(X) ((struct scm_async *)SCM_CDR (X))
-
-
-
-
\f
-#ifdef __STDC__
-static int
-asyncs_pending (void)
-#else
+static int asyncs_pending SCM_P ((void));
+
static int
asyncs_pending ()
-#endif
{
SCM pos;
pos = scm_asyncs;
return 0;
}
+#if 0
+static SCM scm_sys_tick_async_thunk SCM_P ((void));
+static SCM
+scm_sys_tick_async_thunk ()
+{
+ scm_deliver_signal (SCM_TICK_SIGNAL);
+ return SCM_BOOL_F;
+}
+#endif
-#ifdef __STDC__
-void
-scm_async_click (void)
-#else
void
scm_async_click ()
-#endif
{
int owe_switch;
int owe_tick;
}
}
- if (owe_tick)
- scm_async_mark (system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)]);
+ /*
+ if (owe_tick)
+ scm_async_mark (system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)]);
+ */
SCM_DEFER_INTS;
if (scm_tick_rate && scm_switch_rate)
\f
-#ifdef __STDC__
-void
-scm_switch (void)
-#else
+
void
scm_switch ()
-#endif
-{}
-
-
-#ifdef __STDC__
-static void
-scm_deliver_signal (int num)
-#else
-static void
-scm_deliver_signal (num)
- int num;
-#endif
{
- SCM handler;
- handler = SCM_CDR (handler_var);
- if (handler != SCM_BOOL_F)
- scm_apply (handler, SCM_MAKINUM (num), scm_listofnull);
- else
- {
- scm_mask_ints = 0;
- scm_throw (symbol_signal,
- scm_listify (SCM_MAKINUM (num), SCM_UNDEFINED));
- }
+#if 0 /* Thread switching code should probably reside here, but the
+ async switching code doesn't seem to work, so it's put in the
+ SCM_ASYNC_TICK macro instead. /mdj */
+ SCM_THREAD_SWITCHING_CODE;
+#endif
}
-
\f
-#ifdef __STDC__
-static int
-print_async (SCM exp, SCM port, int writing)
-#else
+static int print_async SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
+
static int
-print_async (exp, port, writing)
+print_async (exp, port, pstate)
SCM exp;
SCM port;
- int writing;
-#endif
+ scm_print_state *pstate;
{
- scm_
gen_puts (scm_regular_string, "#<async ", port);
+ scm_
puts ("#<async ", port);
scm_intprint(exp, 16, port);
- scm_gen_putc('>', port);
+ scm_putc('>', port);
return 1;
}
-#ifdef __STDC__
-static SCM
-mark_async (SCM obj)
-#else
+
+static SCM mark_async SCM_P ((SCM obj));
+
static SCM
mark_async (obj)
SCM obj;
-#endif
{
struct scm_async * it;
if (SCM_GC8MARKP (obj))
return it->thunk;
}
-#ifdef __STDC__
-static scm_sizet
-free_async (SCM obj)
-#else
+
+static scm_sizet free_async SCM_P ((SCM obj));
+
static scm_sizet
-free_async (SCM obj)
+free_async (obj)
SCM obj;
-#endif
{
struct scm_async * it;
it = SCM_ASYNC (obj);
\f
SCM_PROC(s_async, "async", 1, 0, 0, scm_async);
-#ifdef __STDC__
-SCM
-scm_async (SCM thunk)
-#else
+
SCM
scm_async (thunk)
SCM thunk;
-#endif
{
SCM it;
struct scm_async * async;
}
SCM_PROC(s_system_async, "system-async", 1, 0, 0, scm_system_async);
-#ifdef __STDC__
-SCM
-scm_system_async (SCM thunk)
-#else
+
SCM
scm_system_async (thunk)
SCM thunk;
-#endif
{
SCM it;
SCM list;
}
SCM_PROC(s_async_mark, "async-mark", 1, 0, 0, scm_async_mark);
-#ifdef __STDC__
-SCM
-scm_async_mark (SCM a)
-#else
+
SCM
scm_async_mark (a)
SCM a;
-#endif
{
struct scm_async * it;
SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark);
SCM_PROC(s_system_async_mark, "system-async-mark", 1, 0, 0, scm_system_async_mark);
-#ifdef __STDC__
-SCM
-scm_system_async_mark (SCM a)
-#else
+
SCM
scm_system_async_mark (a)
SCM a;
-#endif
{
struct scm_async * it;
SCM_ASSERT (SCM_NIMP (a) && SCM_ASYNCP (a), a, SCM_ARG1, s_async_mark);
SCM_PROC(s_run_asyncs, "run-asyncs", 1, 0, 0, scm_run_asyncs);
-#ifdef __STDC__
-SCM
-scm_run_asyncs (SCM list_of_a)
-#else
+
SCM
scm_run_asyncs (list_of_a)
SCM list_of_a;
-#endif
{
SCM pos;
SCM_PROC(s_noop, "noop", 0, 0, 1, scm_noop);
-#ifdef __STDC__
-SCM
-scm_noop (SCM args)
-#else
+
SCM
scm_noop (args)
SCM args;
-#endif
{
return (SCM_NULLP (args)
? SCM_BOOL_F
\f
SCM_PROC(s_set_tick_rate, "set-tick-rate", 1, 0, 0, scm_set_tick_rate);
-#ifdef __STDC__
-SCM
-scm_set_tick_rate (SCM n)
-#else
+
SCM
scm_set_tick_rate (n)
SCM n;
-#endif
{
unsigned int old_n;
SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_tick_rate);
SCM_PROC(s_set_switch_rate, "set-switch-rate", 1, 0, 0, scm_set_switch_rate);
-#ifdef __STDC__
-SCM
-scm_set_switch_rate (SCM n)
-#else
+
SCM
scm_set_switch_rate (n)
SCM n;
-#endif
{
unsigned int old_n;
SCM_ASSERT (SCM_INUMP (n), n, SCM_ARG1, s_set_switch_rate);
\f
-#ifdef __STDC__
-static SCM
-scm_sys_hup_async_thunk (void)
-#else
-static SCM
-scm_sys_hup_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_HUP_SIGNAL);
- return SCM_BOOL_F;
-}
-
-#ifdef __STDC__
-static SCM
-scm_sys_int_async_thunk (void)
-#else
-static SCM
-scm_sys_int_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_INT_SIGNAL);
- return SCM_BOOL_F;
-}
-
-#ifdef __STDC__
-static SCM
-scm_sys_fpe_async_thunk (void)
-#else
-static SCM
-scm_sys_fpe_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_FPE_SIGNAL);
- return SCM_BOOL_F;
-}
+/* points to the GC system-async, so that scm_gc_end can find it. */
+SCM scm_gc_async;
-#ifdef __STDC__
-static SCM
-scm_sys_bus_async_thunk (void)
-#else
-static SCM
-scm_sys_bus_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_BUS_SIGNAL);
- return SCM_BOOL_F;
-}
+/* the vcell for gc-thunk. */
+static SCM scm_gc_vcell;
-#ifdef __STDC__
-static SCM
-scm_sys_segv_async_thunk (void)
-#else
-static SCM
-scm_sys_segv_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_SEGV_SIGNAL);
- return SCM_BOOL_F;
-}
-
-#ifdef __STDC__
-static SCM
-scm_sys_alrm_async_thunk (void)
-#else
-static SCM
-scm_sys_alrm_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_ALRM_SIGNAL);
- return SCM_BOOL_F;
-}
-
-#ifdef __STDC__
+/* the thunk installed in the GC system-async, which is marked at the
+ end of garbage collection. */
static SCM
scm_sys_gc_async_thunk (void)
-#else
-static SCM
-scm_sys_gc_async_thunk ()
-#endif
{
- scm_deliver_signal (SCM_GC_SIGNAL);
- return SCM_BOOL_F;
-}
-
-#ifdef __STDC__
-static SCM
-scm_sys_tick_async_thunk (void)
-#else
-static SCM
-scm_sys_tick_async_thunk ()
-#endif
-{
- scm_deliver_signal (SCM_TICK_SIGNAL);
- return SCM_BOOL_F;
-}
-
-
-
-\f
-
-#ifdef __STDC__
-SCM
-scm_take_signal (int n)
-#else
-SCM
-scm_take_signal (n)
- int n;
-#endif
-{
- SCM ignored;
- if (!scm_ints_disabled)
+ if (SCM_NFALSEP (scm_gc_vcell))
{
- SCM_NEWCELL (ignored); /* In case we interrupted SCM_NEWCELL,
- * throw out the possibly already allocated
- * free cell.
- */
+ SCM proc = SCM_CDR (scm_gc_vcell);
+
+ if (SCM_NFALSEP (proc) && !SCM_UNBNDP (proc))
+ scm_apply (proc, SCM_EOL, SCM_EOL);
}
- scm_system_async_mark (system_signal_asyncs[SCM_SIG_ORD(n)]);
- return SCM_BOOL_F;
+ return SCM_UNSPECIFIED;
}
\f
SCM_PROC(s_unmask_signals, "unmask-signals", 0, 0, 0, scm_unmask_signals);
-#ifdef __STDC__
-SCM
-scm_unmask_signals (void)
-#else
+
SCM
scm_unmask_signals ()
-#endif
{
scm_mask_ints = 0;
return SCM_UNSPECIFIED;
SCM_PROC(s_mask_signals, "mask-signals", 0, 0, 0, scm_mask_signals);
-#ifdef __STDC__
-SCM
-scm_mask_signals (void)
-#else
+
SCM
scm_mask_signals ()
-#endif
{
scm_mask_ints = 1;
return SCM_UNSPECIFIED;
\f
-#ifdef __STDC__
-void
-scm_init_async (void)
-#else
void
scm_init_async ()
-#endif
{
SCM a_thunk;
scm_tc16_async = scm_newsmob (&async_smob);
- symbol_signal = SCM_CAR (scm_sysintern ("signal", strlen ("signal")));
- scm_permanent_object (symbol_signal);
-
- /* These are in the opposite order of delivery priortity.
- *
- * Error conditions are given low priority:
- */
- a_thunk = scm_make_gsubr ("%hup-thunk", 0, 0, 0, scm_sys_hup_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_HUP_SIGNAL)] = scm_system_async (a_thunk);
- a_thunk = scm_make_gsubr ("%int-thunk", 0, 0, 0, scm_sys_int_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_INT_SIGNAL)] = scm_system_async (a_thunk);
- a_thunk = scm_make_gsubr ("%fpe-thunk", 0, 0, 0, scm_sys_fpe_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_FPE_SIGNAL)] = scm_system_async (a_thunk);
- a_thunk = scm_make_gsubr ("%bus-thunk", 0, 0, 0, scm_sys_bus_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_BUS_SIGNAL)] = scm_system_async (a_thunk);
- a_thunk = scm_make_gsubr ("%segv-thunk", 0, 0, 0, scm_sys_segv_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_SEGV_SIGNAL)] = scm_system_async (a_thunk);
-
+ scm_gc_vcell = scm_sysintern ("gc-thunk", SCM_BOOL_F);
a_thunk = scm_make_gsubr ("%gc-thunk", 0, 0, 0, scm_sys_gc_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_GC_SIGNAL)] = scm_system_async (a_thunk);
-
- /* Clock and PC driven conditions are given highest priority. */
- a_thunk = scm_make_gsubr ("%tick-thunk", 0, 0, 0, scm_sys_tick_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_TICK_SIGNAL)] = scm_system_async (a_thunk);
- a_thunk = scm_make_gsubr ("%alrm-thunk", 0, 0, 0, scm_sys_alrm_async_thunk);
- system_signal_asyncs[SCM_SIG_ORD(SCM_ALRM_SIGNAL)] = scm_system_async (a_thunk);
+ scm_gc_async = scm_system_async (a_thunk);
- handler_var = scm_sysintern ("signal-handler", strlen ("signal"));
- SCM_SETCDR (handler_var, SCM_BOOL_F);
- scm_permanent_object (handler_var);
#include "async.x"
}
HCoop / bpt / guile.git / blobdiff