mirror of
https://git.savannah.gnu.org/git/guile.git
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335 lines
7.7 KiB
C
335 lines
7.7 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "libguile/validate.h"
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#include "libguile/root.h"
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#include "libguile/stackchk.h"
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#include "libguile/async.h"
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <stdio.h>
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void *scm_null_threads_data;
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static SCM main_thread;
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typedef struct {
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int level;
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} scm_null_mutex;
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typedef struct {
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int signalled;
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} scm_null_cond;
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void
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scm_threads_init (SCM_STACKITEM *i)
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{
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scm_tc16_thread = scm_make_smob_type ("thread", 0);
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scm_tc16_mutex = scm_make_smob_type ("mutex", sizeof (scm_null_mutex));
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scm_tc16_condvar = scm_make_smob_type ("condition-variable",
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sizeof (scm_null_cond));
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main_thread = scm_permanent_object (scm_cell (scm_tc16_thread, 0));
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scm_null_threads_data = NULL;
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}
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#ifdef __ia64__
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# define SCM_MARK_BACKING_STORE() do { \
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ucontext_t ctx; \
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SCM_STACKITEM * top, * bot; \
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getcontext (&ctx); \
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scm_mark_locations ((SCM_STACKITEM *) &ctx.uc_mcontext, \
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((size_t) (sizeof (SCM_STACKITEM) - 1 + sizeof ctx.uc_mcontext) \
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/ sizeof (SCM_STACKITEM))); \
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bot = (SCM_STACKITEM *) __libc_ia64_register_backing_store_base; \
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top = (SCM_STACKITEM *) ctx.uc_mcontext.sc_ar_bsp; \
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scm_mark_locations (bot, top - bot); } while (0)
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#else
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# define SCM_MARK_BACKING_STORE()
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#endif
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void
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scm_threads_mark_stacks (void)
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{
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/* Mark objects on the C stack. */
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SCM_FLUSH_REGISTER_WINDOWS;
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/* This assumes that all registers are saved into the jmp_buf */
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setjmp (scm_save_regs_gc_mark);
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scm_mark_locations ((SCM_STACKITEM *) scm_save_regs_gc_mark,
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( (size_t) (sizeof (SCM_STACKITEM) - 1 +
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sizeof scm_save_regs_gc_mark)
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/ sizeof (SCM_STACKITEM)));
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{
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unsigned long stack_len = scm_stack_size (scm_stack_base);
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#if SCM_STACK_GROWS_UP
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scm_mark_locations (scm_stack_base, stack_len);
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#else
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scm_mark_locations (scm_stack_base - stack_len, stack_len);
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#endif
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}
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SCM_MARK_BACKING_STORE();
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}
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SCM
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scm_call_with_new_thread (SCM argl)
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#define FUNC_NAME s_call_with_new_thread
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{
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SCM_MISC_ERROR ("threads are not supported in this version of Guile",
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SCM_EOL);
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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SCM
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scm_spawn_thread (scm_t_catch_body body, void *body_data,
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scm_t_catch_handler handler, void *handler_data)
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{
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scm_misc_error ("scm_spawn_thread",
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"threads are not supported in this version of Guile",
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SCM_EOL);
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return SCM_BOOL_F;
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}
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SCM
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scm_current_thread (void)
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{
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return main_thread;
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}
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SCM
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scm_all_threads (void)
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{
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return scm_list_1 (main_thread);
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}
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scm_root_state *
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scm_i_thread_root (SCM thread)
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{
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return (scm_root_state *)scm_null_threads_data;
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}
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SCM
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scm_join_thread (SCM thread)
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#define FUNC_NAME s_join_thread
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{
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SCM_MISC_ERROR ("threads are not supported in this version of Guile",
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SCM_EOL);
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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int
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scm_c_thread_exited_p (SCM thread)
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#define FUNC_NAME s_scm_thread_exited_p
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{
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return 0;
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}
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#undef FUNC_NAME
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SCM
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scm_yield (void)
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{
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return SCM_BOOL_T;
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}
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SCM
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scm_make_mutex (void)
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{
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SCM m = scm_make_smob (scm_tc16_mutex);
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scm_null_mutex *mx = SCM_MUTEX_DATA(m);
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mx->level = 0;
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return m;
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}
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SCM
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scm_lock_mutex (SCM m)
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{
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scm_null_mutex *mx;
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SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_lock_mutex);
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mx = SCM_MUTEX_DATA(m);
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mx->level++;
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return SCM_BOOL_T;
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}
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SCM
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scm_try_mutex (SCM m)
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{
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return scm_lock_mutex (m); /* will always succeed right away. */
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}
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SCM
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scm_unlock_mutex (SCM m)
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{
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scm_null_mutex *mx;
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SCM_ASSERT (SCM_MUTEXP (m), m, SCM_ARG1, s_unlock_mutex);
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mx = SCM_MUTEX_DATA(m);
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if (mx->level == 0)
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scm_misc_error (s_unlock_mutex, "mutex is not locked", SCM_EOL);
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mx->level--;
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return SCM_BOOL_T;
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}
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SCM
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scm_make_condition_variable (void)
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{
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scm_null_cond *cv;
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SCM c = scm_make_smob (scm_tc16_condvar);
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cv = SCM_CONDVAR_DATA (c);
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cv->signalled = 0;
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return c;
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}
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/* Subtract the `struct timeval' values X and Y,
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storing the result in RESULT. Might modify Y.
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Return 1 if the difference is negative or zero, otherwise 0. */
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static int
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timeval_subtract (result, x, y)
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struct timeval *result, *x, *y;
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{
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/* Perform the carry for the later subtraction by updating Y. */
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if (x->tv_usec < y->tv_usec) {
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int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
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y->tv_usec -= 1000000 * nsec;
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y->tv_sec += nsec;
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}
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if (x->tv_usec - y->tv_usec > 1000000) {
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int nsec = (x->tv_usec - y->tv_usec) / 1000000;
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y->tv_usec += 1000000 * nsec;
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y->tv_sec -= nsec;
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}
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/* Compute the time remaining to wait.
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`tv_usec' is certainly positive. */
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result->tv_sec = x->tv_sec - y->tv_sec;
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result->tv_usec = x->tv_usec - y->tv_usec;
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/* Return 1 if result is negative or zero. */
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return x->tv_sec < y->tv_sec
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|| (result->tv_sec == 0 && result->tv_usec == 0);
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}
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SCM
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scm_timed_wait_condition_variable (SCM c, SCM m, SCM t)
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#define FUNC_NAME s_wait_condition_variable
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{
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scm_null_cond *cv;
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struct timeval waittime;
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SCM_ASSERT (SCM_CONDVARP (c),
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c,
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SCM_ARG1,
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s_wait_condition_variable);
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SCM_ASSERT (SCM_MUTEXP (m),
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m,
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SCM_ARG2,
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s_wait_condition_variable);
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if (!SCM_UNBNDP (t))
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{
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if (SCM_CONSP (t))
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{
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SCM_VALIDATE_UINT_COPY (3, SCM_CAR(t), waittime.tv_sec);
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SCM_VALIDATE_UINT_COPY (3, SCM_CDR(t), waittime.tv_usec);
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}
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else
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{
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SCM_VALIDATE_UINT_COPY (3, t, waittime.tv_sec);
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waittime.tv_usec = 0;
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}
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}
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cv = SCM_CONDVAR_DATA (c);
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scm_unlock_mutex (m);
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while (!cv->signalled)
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{
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if (SCM_UNBNDP (t))
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select (0, NULL, NULL, NULL, NULL);
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else
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{
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struct timeval now, then, diff;
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then = waittime;
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gettimeofday (&now, NULL);
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if (timeval_subtract (&diff, &then, &now))
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break;
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select (0, NULL, NULL, NULL, &diff);
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}
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SCM_ASYNC_TICK;
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}
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scm_lock_mutex (m);
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if (cv->signalled)
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{
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cv->signalled = 0;
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return SCM_BOOL_T;
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}
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return SCM_BOOL_F;
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}
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#undef FUNC_NAME
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SCM
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scm_signal_condition_variable (SCM c)
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{
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scm_null_cond *cv;
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SCM_ASSERT (SCM_CONDVARP (c),
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c,
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SCM_ARG1,
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s_signal_condition_variable);
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cv = SCM_CONDVAR_DATA (c);
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cv->signalled = 1;
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return SCM_BOOL_T;
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}
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SCM
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scm_broadcast_condition_variable (SCM c)
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{
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return scm_signal_condition_variable (c); /* only one thread anyway. */
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}
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unsigned long
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scm_thread_usleep (unsigned long usec)
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{
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struct timeval timeout;
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timeout.tv_sec = 0;
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timeout.tv_usec = usec;
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select (0, NULL, NULL, NULL, &timeout);
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return 0; /* Maybe we should calculate actual time slept,
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but this is faster... :) */
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}
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unsigned long
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scm_thread_sleep (unsigned long sec)
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{
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time_t now = time (NULL);
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struct timeval timeout;
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unsigned long slept;
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timeout.tv_sec = sec;
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timeout.tv_usec = 0;
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select (0, NULL, NULL, NULL, &timeout);
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slept = time (NULL) - now;
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return slept > sec ? 0 : sec - slept;
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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