Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / coop-pthreads.h

diff --git a/guile18/libguile/coop-pthreads.h b/guile18/libguile/coop-pthreads.h
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+/* classes: h_files */
+
+#ifndef SCM_COOP_PTHREADS_H
+#define SCM_COOP_PTHREADS_H
+
+/* Copyright (C) 2002, 2006 Free Software Foundation, Inc.
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+\f
+
+/* The coop-pthreads implementation.  We use pthreads for the basic
+   multi threading stuff, but rig it so that only one thread is ever
+   active inside Guile.
+*/
+
+#include <pthread.h>
+
+#include "libguile/iselect.h"
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+
+/* Thread local data support --- generic C API */
+
+typedef pthread_key_t scm_t_key;
+
+#define scm_key_create pthread_key_create
+#define scm_setspecific pthread_setspecific
+#define scm_getspecific pthread_getspecific
+#define scm_key_delete pthread_key_delete
+
+#endif /* SCM_ENABLE_DEPRECATED == 1 */
+
+/* Since only one thread can be active anyway, we don't need to do
+   anything special around critical sections.  In fact, that's the
+   reason we do only support cooperative threading: Guile's critical
+   regions have not been completely identified yet.  (I think.) */
+
+#define SCM_CRITICAL_SECTION_START 
+#define SCM_CRITICAL_SECTION_END 
+
+#define SCM_I_THREAD_SWITCH_COUNT       50
+
+#define SCM_THREAD_SWITCHING_CODE \
+do { \
+  scm_i_switch_counter--; \
+  if (scm_i_switch_counter == 0) \
+    { \
+      scm_i_switch_counter = SCM_I_THREAD_SWITCH_COUNT; \
+      scm_yield(); \
+    } \
+} while (0)
+
+SCM_API int scm_i_switch_counter;
+
+#define SCM_THREAD_LOCAL_DATA          (scm_i_copt_thread_data)
+#define SCM_SET_THREAD_LOCAL_DATA(ptr) (scm_i_copt_set_thread_data (ptr))
+
+SCM_API void *scm_i_copt_thread_data;
+SCM_API void scm_i_copt_set_thread_data (void *data);
+
+#endif  /* SCM_COOP_PTHREAD_H */
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/