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diff --git a/libguile/null-threads.h b/libguile/null-threads.h
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+#ifndef SCM_NULL_THREADS_H
+#define SCM_NULL_THREADS_H
+
+/* Copyright 2005-2006,2010,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Guile 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 Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+
+/* The null-threads implementation. We provide the subset of the
+ standard pthread API that is used by Guile, but no new threads can
+ be created.
+
+ This file merely exits so that Guile can be compiled and run
+ without using pthreads. Improving performance via optimizations
+ that are possible in a single-threaded program is not a primary
+ goal.
+*/
+
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+
+/* Threads
+*/
+typedef int scm_i_pthread_t;
+typedef void scm_i_pthread_attr_t;
+
+static inline scm_i_pthread_t
+scm_i_pthread_self (void)
+{
+ return 0;
+}
+
+static inline int
+scm_i_pthread_create (scm_i_pthread_t *t, const scm_i_pthread_attr_t *attr,
+ void* (*f) (void*), void *arg)
+{
+ return ENOSYS;
+}
+
+static inline int
+scm_i_pthread_detach (scm_i_pthread_t t)
+{
+ return 0;
+}
+
+static inline void
+scm_i_pthread_exit (void *retval)
+{
+ exit (EXIT_SUCCESS);
+}
+
+static inline int
+scm_i_pthread_cancel (scm_i_pthread_t t)
+{
+ return 0;
+}
+
+static inline int
+scm_i_sched_yield (void)
+{
+ return 0;
+}
+
+
+/* Signals
+ */
+static inline int
+scm_i_pthread_sigmask (int how, const sigset_t *set, sigset_t *oldset)
+{
+ return sigprocmask (how, set, oldset);
+}
+
+/* Mutexes
+ */
+typedef enum {
+ SCM_I_PTHREAD_MUTEX_INITIALIZER = 0,
+ SCM_I_PTHREAD_MUTEX_LOCKED = 1
+} scm_i_pthread_mutex_t;
+typedef int scm_i_pthread_mutexattr_t;
+
+static inline int
+scm_i_pthread_mutex_init (scm_i_pthread_mutex_t *m,
+ scm_i_pthread_mutexattr_t *attr)
+{
+ *m = SCM_I_PTHREAD_MUTEX_INITIALIZER;
+ return 0;
+}
+
+static inline int
+scm_i_pthread_mutex_destroy (scm_i_pthread_mutex_t *m)
+{
+ return 0;
+}
+
+static inline int
+scm_i_pthread_mutex_trylock(scm_i_pthread_mutex_t *m)
+{
+ if (*m == SCM_I_PTHREAD_MUTEX_LOCKED)
+ return EDEADLK;
+ *m = SCM_I_PTHREAD_MUTEX_LOCKED;
+ return 0;
+}
+
+static inline int
+scm_i_pthread_mutex_lock (scm_i_pthread_mutex_t *m)
+{
+ *m = SCM_I_PTHREAD_MUTEX_LOCKED;
+ return 0;
+}
+
+static inline int
+scm_i_pthread_mutex_unlock (scm_i_pthread_mutex_t *m)
+{
+ *m = SCM_I_PTHREAD_MUTEX_INITIALIZER;
+ return 0;
+}
+
+#define scm_i_pthread_mutexattr_recursive 0
+
+/* Condition variables
+ */
+typedef enum {
+ SCM_I_PTHREAD_COND_INITIALIZER = 0
+} scm_i_pthread_cond_t;
+typedef int scm_i_pthread_condattr_t;
+
+static inline int
+scm_i_pthread_cond_init (scm_i_pthread_cond_t *c,
+ scm_i_pthread_condattr_t *attr)
+{
+ *c = SCM_I_PTHREAD_COND_INITIALIZER;
+ return 0;
+}
+
+static inline int
+scm_i_pthread_cond_destroy (scm_i_pthread_cond_t *c)
+{
+ return 0;
+}
+
+static inline int
+scm_i_pthread_cond_signal (scm_i_pthread_cond_t *c)
+{
+ return 0;
+}
+
+static inline int
+scm_i_pthread_cond_broadcast (scm_i_pthread_cond_t *c)
+{
+ return 0;
+}
+
+static inline int
+scm_i_pthread_cond_wait (scm_i_pthread_cond_t *c, scm_i_pthread_mutex_t *m)
+{
+ abort ();
+ return 0;
+}
+
+static inline int
+scm_i_pthread_cond_timedwait (scm_i_pthread_cond_t *c, scm_i_pthread_mutex_t *m,
+ const scm_t_timespec *t)
+{
+ abort();
+ return 0;
+}
+
+/* Onces
+ */
+typedef enum {
+ SCM_I_PTHREAD_ONCE_INIT = 0,
+ SCM_I_PTHREAD_ONCE_ALREADY = 1
+} scm_i_pthread_once_t;
+
+static inline int
+scm_i_pthread_once (scm_i_pthread_once_t *o, void(*init)(void))
+{
+ if (*o == SCM_I_PTHREAD_ONCE_INIT)
+ {
+ *o = SCM_I_PTHREAD_ONCE_ALREADY;
+ init ();
+ }
+ return 0;
+}
+
+/* Thread specific storage
+ */
+typedef struct scm_i_pthread_key_t {
+ struct scm_i_pthread_key_t *next;
+ void *value;
+ void (*destr_func) (void *);
+} scm_i_pthread_key_t;
+
+SCM_API int scm_i_pthread_key_create (scm_i_pthread_key_t *key,
+ void (*destr_func) (void *));
+#define scm_i_pthread_setspecific(k,p) ((k).value = (p))
+#define scm_i_pthread_getspecific(k) ((k).value)
+
+/* Convenience functions
+ */
+#define scm_i_scm_pthread_mutex_lock scm_i_pthread_mutex_lock
+#define scm_i_dynwind_pthread_mutex_lock scm_i_pthread_mutex_lock
+#define scm_i_scm_pthread_cond_wait scm_i_pthread_cond_wait
+#define scm_i_scm_pthread_cond_timedwait scm_i_pthread_cond_timedwait
+
+
+#endif /* SCM_NULL_THREADS_H */