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authorChristian Grothoff <christian@grothoff.org>2018-03-12 14:07:42 +0100
committerChristian Grothoff <christian@grothoff.org>2018-04-02 14:29:44 +0200
commit7a20062bafed42f937c5388aed09042aad7014c0 (patch)
treef47da67f2a23bb79779e6b0dafc7d8b7b6e3f7c2
parent3e191f3b080f692bbb80c66f5c24736955f3f46d (diff)
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modify wire plugin load logic to use reference counting
-rw-r--r--src/wire/wire.c81
1 files changed, 79 insertions, 2 deletions
diff --git a/src/wire/wire.c b/src/wire/wire.c
index c799334f..58180b7b 100644
--- a/src/wire/wire.c
+++ b/src/wire/wire.c
@@ -1,6 +1,6 @@
/*
This file is part of TALER
- (C) 2015, 2016, 2017 GNUnet e.V.
+ (C) 2015, 2016, 2017, 2018 GNUnet e.V.
TALER 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
@@ -23,6 +23,50 @@
#include "taler_util.h"
#include "taler_wire_lib.h"
+
+/**
+ * A wire plugin that we have loaded.
+ */
+struct WirePlugin
+{
+ /**
+ * We keep these in a DLL.
+ */
+ struct WirePlugin *next;
+
+ /**
+ * We keep these in a DLL.
+ */
+ struct WirePlugin *prev;
+
+ /**
+ * Type of this wire plugin.
+ */
+ char *type;
+
+ /**
+ * Wire plugin
+ */
+ struct TALER_WIRE_Plugin *plugin;
+
+ /**
+ * Reference counter for the plugin.
+ */
+ unsigned int rc;
+};
+
+
+/**
+ * Head of the DLL of loaded wire plugins.
+ */
+static struct WirePlugin *wp_head;
+
+/**
+ * Tail of the DLL of loaded wire plugins.
+ */
+static struct WirePlugin *wp_tail;
+
+
/**
* Load a WIRE plugin.
*
@@ -36,7 +80,15 @@ TALER_WIRE_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg,
{
char *lib_name;
struct TALER_WIRE_Plugin *plugin;
-
+ struct WirePlugin *wp;
+
+ for (wp = wp_head; NULL != wp; wp = wp->next)
+ if (0 == strcasecmp (plugin_name,
+ wp->type))
+ {
+ wp->rc++;
+ return wp->plugin;
+ }
(void) GNUNET_asprintf (&lib_name,
"libtaler_plugin_wire_%s",
plugin_name);
@@ -46,6 +98,15 @@ TALER_WIRE_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg,
plugin->library_name = lib_name;
else
GNUNET_free (lib_name);
+ if (NULL == plugin)
+ return NULL;
+ wp = GNUNET_new (struct WirePlugin);
+ wp->plugin = plugin;
+ wp->type = GNUNET_strdup (plugin_name);
+ GNUNET_CONTAINER_DLL_insert (wp_head,
+ wp_tail,
+ wp);
+ wp->rc = 1;
return plugin;
}
@@ -58,10 +119,26 @@ TALER_WIRE_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg,
void
TALER_WIRE_plugin_unload (struct TALER_WIRE_Plugin *plugin)
{
+ struct WirePlugin *wp;
char *lib_name;
if (NULL == plugin)
return;
+ for (wp = wp_head; NULL != wp; wp = wp->next)
+ {
+ if (plugin == wp->plugin)
+ {
+ wp->rc--;
+ if (0 < wp->rc)
+ return;
+ GNUNET_CONTAINER_DLL_remove (wp_head,
+ wp_tail,
+ wp);
+ GNUNET_free (wp->type);
+ GNUNET_free (wp);
+ break;
+ }
+ }
lib_name = plugin->library_name;
GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
plugin));