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+/* classes: h_files */
+
+#ifndef MIT_PTHREADSH
+#define MIT_PTHREADSH
+
+/* 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, 675 Mass Ave, Cambridge, MA 02139, 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"
+
+#define PTHREAD_KERNEL
+#include <pthread.h>
+
+/* Identify where the stack pointer can be found in a jmpbuf.
+ */
+
+/* Solaris 2.4 */
+#if defined(__sparc_setjmp_h)
+# define THREAD_SP machdep_data.machdep_state[2]
+#endif
+
+/* Solaris 2.5 */
+#if defined(__sparc)
+#ifndef THREAD_SP
+# define THREAD_SP machdep_data.machdep_state[2]
+#endif
+#endif
+
+#if defined(linux)
+# define THREAD_SP machdep_data.machdep_state[0].__sp
+#endif
+
+#if defined(sgi)
+# define THREAD_SP machdep_data.machdep_state[JB_SP]
+#endif
+
+/* ...define THREAD_SP for your architecture here...
+ */
+
+#if !defined(THREAD_SP)
+--> where is your stack pointer?
+#endif
+
+
+
+/* Boost the priority of this thread so that it is the only
+ one running. PTHREAD_MAX_PRIORITY is reserved for this
+ purpose */
+
+#define SCM_THREAD_CRITICAL_SECTION_START \
+ struct sched_param param; \
+ int previous_prio; \
+ int policy; \
+ pthread_getschedparam(pthread_self(), &policy, &param); \
+ previous_prio = param.prio; \
+ param.prio = PTHREAD_MAX_PRIORITY; \
+ pthread_setschedparam(pthread_self(), policy, &param)
+
+#define SCM_THREAD_CRITICAL_SECTION_END \
+ param.prio = previous_prio; \
+ pthread_setschedparam(pthread_self(), policy, &param)
+
+
+
+#if 1
+
+#define SCM_NO_CRITICAL_SECTION_OWNER 0
+
+#define SCM_THREAD_DEFER pthread_kernel_lock++
+#define SCM_THREAD_ALLOW pthread_kernel_lock--
+
+#define SCM_THREAD_REDEFER pthread_kernel_lock++
+#define SCM_THREAD_REALLOW_1 pthread_kernel_lock--
+#define SCM_THREAD_REALLOW_2 \
+{ \
+ scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
+ pthread_mutex_unlock(&scm_critical_section_mutex); \
+}
+
+#else
+
+#define SCM_NO_CRITICAL_SECTION_OWNER 0
+
+#define SCM_THREAD_DEFER \
+{ \
+ pthread_mutex_lock (&scm_critical_section_mutex); \
+ scm_critical_section_owner = pthread_self(); \
+}
+
+#define SCM_THREAD_ALLOW \
+{ \
+ scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
+ pthread_mutex_unlock (&scm_critical_section_mutex); \
+}
+
+#define SCM_THREAD_REDEFER \
+{ \
+ if ((scm_critical_section_owner != pthread_self()) || \
+ (scm_critical_section_owner == SCM_NO_CRITICAL_SECTION_OWNER)) \
+ { \
+ pthread_mutex_lock(&scm_critical_section_mutex); \
+ scm_critical_section_owner = pthread_self(); \
+ } \
+}
+
+#define SCM_THREAD_REALLOW_1
+#define SCM_THREAD_REALLOW_2 \
+{ \
+ scm_critical_section_owner = SCM_NO_CRITICAL_SECTION_OWNER; \
+ pthread_mutex_unlock (&scm_critical_section_mutex); \
+}
+
+#endif
+
+#define SCM_THREAD_SWITCHING_CODE
+
+#define SCM_THREAD_LOCAL_DATA (pthread_self () -> attr.arg_attr)
+#define SCM_SET_THREAD_LOCAL_DATA(new_root) \
+{ \
+ pthread_t t = pthread_self (); \
+ void *r = (new_root); \
+ pthread_attr_setcleanup (&t -> attr, NULL, r); \
+ pthreads_find_info (t) -> root = r; \
+}
+
+
+
+
+void scm_threads_init_mit_pthreads ();
+
+typedef struct QUEUE {
+ struct QUEUE *flink, *blink;
+} queue;
+
+extern pthread_mutex_t scm_critical_section_mutex;
+extern pthread_t scm_critical_section_owner;
+
+/* Key to thread specific data */
+extern pthread_key_t info_key;
+
+struct scm_pthread_create_info_type
+{
+ SCM thunk;
+ SCM error;
+ SCM *prots;
+} scm_pthread_create_info;
+
+#endif /* MIT_PTHREADSH */