-/* extensions.c - registering and loading extensions.
- *
- * Copyright (C) 2001 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, 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.
- *
- * 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"
-#include "libguile/strings.h"
-#include "libguile/gc.h"
-#include "libguile/dynl.h"
-
-#include "libguile/extensions.h"
-
-typedef struct extension_t
-{
- struct extension_t *next;
- const char *lib;
- const char *init;
- void (*func)(void *);
- void *data;
-} extension_t;
-
-static extension_t *registered_extensions;
-
-void
-scm_c_register_extension (const char *lib, const char *init,
- void (*func) (void *), void *data)
-{
- extension_t *ext = scm_must_malloc (sizeof(extension_t),
- "scm_register_extension");
- ext->lib = scm_must_strdup (lib);
- ext->init = scm_must_strdup (init);
- ext->func = func;
- ext->data = data;
-
- ext->next = registered_extensions;
- registered_extensions = ext;
-}
-
-static void
-load_extension (SCM lib, SCM init)
-{
- /* Search the registry. */
- {
- extension_t *ext;
-
- for (ext = registered_extensions; ext; ext = ext->next)
- if (!strcmp (ext->lib, SCM_STRING_CHARS (lib))
- && !strcmp (ext->init, SCM_STRING_CHARS (init)))
- {
- ext->func (ext->data);
- return;
- }
- }
-
- /* Dynamically link the library. */
-
- scm_dynamic_call (init, scm_dynamic_link (lib));
-}
-
-void
-scm_c_load_extension (const char *lib, const char *init)
-{
- load_extension (scm_makfrom0str (lib), scm_makfrom0str (init));
-}
-
-SCM_DEFINE (scm_load_extension, "load-extension", 2, 0, 0,
- (SCM lib, SCM init),
- "Load and initilize the extension designated by LIB and INIT."
-"When there is no pre-registered function for LIB/INIT, this is "
-"equivalent to "
-" "
-" (dynamic-call INIT (dynamic-link LIB)) "
-" "
-"When there is a pre-registered function, that function is called "
-"instead. "
-" "
-"Normally, there is no pre-registered function. This option exists "
-"only for situations where dynamic linking is unavailable or unwanted. "
-"In that case, you would statically link your program with the desired "
-"library, and register its init function right after Guile has been "
-"initialized. "
-" "
-"LIB should be a string denoting a shared library without any file type "
-"suffix such as \".so\". The suffix is provided automatically. It "
-"should also not contain any directory components. Libraries that "
-"implement Guile Extensions should be put into the normal locations for "
-"shared libraries. We recommend to use the naming convention "
-"libguile-bla-blum for a extension related to a module `(bla blum)'. "
-" "
-"The normal way for a extension to be used is to write a small Scheme "
-"file that defines a module, and to load the extension into this "
-"module. When the module is auto-loaded, the extension is loaded as "
-"well. For example, "
-" "
-" (define-module (bla blum)) "
-" "
-" (load-extension \"libguile-bla-blum\" \"bla_init_blum\")")
-#define FUNC_NAME s_scm_load_extension
-{
- SCM_VALIDATE_STRING (1, lib);
- SCM_VALIDATE_STRING (2, init);
- load_extension (lib, init);
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-void
-scm_init_extensions ()
-{
- registered_extensions = NULL;
-#ifndef SCM_MAGIC_SNARFER
-#include "libguile/extensions.x"
-#endif
-}
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* extensions.c - registering and loading extensions.
+ *
+ * Copyright (C) 2001, 2006, 2009, 2010, 2011 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 3 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
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+
+#include "libguile/_scm.h"
+#include "libguile/strings.h"
+#include "libguile/gc.h"
+#include "libguile/dynl.h"
+#include "libguile/dynwind.h"
+
+#include "libguile/extensions.h"
+
+typedef struct extension_t
+{
+ struct extension_t *next;
+ const char *lib;
+ const char *init;
+ void (*func)(void *);
+ void *data;
+} extension_t;
+
+static extension_t *registered_extensions = NULL;
+static scm_i_pthread_mutex_t ext_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER;
+
+/* Register a LIB/INIT pair for use by `scm_load_extension'. LIB is
+ allowed to be NULL and then only INIT is used to identify the
+ registered entry. This is useful when you don't know the library
+ name (which isn't really relevant anyway in a completely linked
+ program) and you are sure that INIT is unique (which it must be for
+ static linking). Hmm, given this reasoning, what use is LIB
+ anyway?
+*/
+
+void
+scm_c_register_extension (const char *lib, const char *init,
+ void (*func) (void *), void *data)
+{
+ extension_t *ext = scm_malloc (sizeof(extension_t));
+ if (lib)
+ ext->lib = scm_strdup (lib);
+ else
+ ext->lib = NULL;
+ ext->init = scm_strdup (init);
+ ext->func = func;
+ ext->data = data;
+
+ scm_i_pthread_mutex_lock (&ext_lock);
+ ext->next = registered_extensions;
+ registered_extensions = ext;
+ scm_i_pthread_mutex_unlock (&ext_lock);
+}
+
+static void
+load_extension (SCM lib, SCM init)
+{
+ extension_t *head;
+
+ scm_i_pthread_mutex_lock (&ext_lock);
+ head = registered_extensions;
+ scm_i_pthread_mutex_unlock (&ext_lock);
+
+ /* Search the registry. */
+ if (head != NULL)
+ {
+ extension_t *ext;
+ char *clib, *cinit;
+ int found = 0;
+
+ scm_dynwind_begin (0);
+
+ clib = scm_to_locale_string (lib);
+ scm_dynwind_free (clib);
+ cinit = scm_to_locale_string (init);
+ scm_dynwind_free (cinit);
+
+ for (ext = head; ext; ext = ext->next)
+ if ((ext->lib == NULL || !strcmp (ext->lib, clib))
+ && !strcmp (ext->init, cinit))
+ {
+ ext->func (ext->data);
+ found = 1;
+ break;
+ }
+
+ scm_dynwind_end ();
+
+ if (found)
+ return;
+ }
+
+ /* Dynamically link the library. */
+#if HAVE_MODULES
+ scm_dynamic_call (init, scm_dynamic_link (lib));
+#else
+ scm_misc_error ("load-extension",
+ "extension ~S:~S not registered and dynamic-link disabled",
+ scm_list_2 (init, lib));
+#endif
+}
+
+void
+scm_c_load_extension (const char *lib, const char *init)
+{
+ load_extension (scm_from_locale_string (lib), scm_from_locale_string (init));
+}
+
+SCM_DEFINE (scm_load_extension, "load-extension", 2, 0, 0,
+ (SCM lib, SCM init),
+ "Load and initialize the extension designated by LIB and INIT.\n"
+ "When there is no pre-registered function for LIB/INIT, this is\n"
+ "equivalent to\n"
+ "\n"
+ "@lisp\n"
+ "(dynamic-call INIT (dynamic-link LIB))\n"
+ "@end lisp\n"
+ "\n"
+ "When there is a pre-registered function, that function is called\n"
+ "instead.\n"
+ "\n"
+ "Normally, there is no pre-registered function. This option exists\n"
+ "only for situations where dynamic linking is unavailable or unwanted.\n"
+ "In that case, you would statically link your program with the desired\n"
+ "library, and register its init function right after Guile has been\n"
+ "initialized.\n"
+ "\n"
+ "LIB should be a string denoting a shared library without any file type\n"
+ "suffix such as \".so\". The suffix is provided automatically. It\n"
+ "should also not contain any directory components. Libraries that\n"
+ "implement Guile Extensions should be put into the normal locations for\n"
+ "shared libraries. We recommend to use the naming convention\n"
+ "libguile-bla-blum for a extension related to a module `(bla blum)'.\n"
+ "\n"
+ "The normal way for a extension to be used is to write a small Scheme\n"
+ "file that defines a module, and to load the extension into this\n"
+ "module. When the module is auto-loaded, the extension is loaded as\n"
+ "well. For example,\n"
+ "\n"
+ "@lisp\n"
+ "(define-module (bla blum))\n"
+ "\n"
+ "(load-extension \"libguile-bla-blum\" \"bla_init_blum\")\n"
+ "@end lisp")
+#define FUNC_NAME s_scm_load_extension
+{
+ load_extension (lib, init);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+void
+scm_init_extensions ()
+{
+#include "libguile/extensions.x"
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff