fw_fcp: use glibc list instead of GList to maintain transaction entries

GList has a slight overhead to allocate entry, while glibc list has no
such overhead. If it is possible to define structure in which the list
pointer is embedded by outselves, glib list is useful.

This commit replaces usage of GList with glibc list.

Signed-off-by: Takashi Sakamoto <[email protected]>

src/fw_fcp.c

@@ -4,6 +4,8 @@
 #include <string.h>
 #include <errno.h>
 
+#include <sys/queue.h>
+
 /**
  * HinawaFwFcp:
  * A FCP transaction executor to node in IEEE 1394 bus.
@@ -62,12 +64,15 @@ enum avc_status {
 	AVC_STATUS_INTERIM		= 0x0f,
 };
 
+struct waiter;
+LIST_HEAD(waiter_entries, waiter);
+
 typedef struct {
 	HinawaFwNode *node;
 	gulong bus_update_handler_id;
 	guint card_id;
 
-	GList *transactions;
+	struct waiter_entries transactions;
 	GMutex transactions_mutex;
 } HinawaFwFcpPrivate;
 G_DEFINE_TYPE_WITH_PRIVATE(HinawaFwFcp, hinawa_fw_fcp, HINAWA_TYPE_FW_RESP)
@@ -287,21 +292,18 @@ struct waiter {
 	guint tstamp;
 	GCond cond;
 	GMutex mutex;
+	LIST_ENTRY(waiter) list;
 };
 
 static void handle_responded_signal(HinawaFwFcp *self, guint tstamp, const guint8 *frame,
 				    guint frame_size)
 {
 	HinawaFwFcpPrivate *priv = hinawa_fw_fcp_get_instance_private(self);
-	GList *entry;
+	struct waiter *w;
 
 	g_mutex_lock(&priv->transactions_mutex);
 
-	for (entry = g_list_first(priv->transactions);
-	     entry != NULL;
-	     entry = g_list_next(priv->transactions)) {
-		struct waiter *w = (struct waiter *)entry->data;
-
+	LIST_FOREACH(w, &priv->transactions, list) {
 		g_mutex_lock(&w->mutex);
 
 		if (w->frame[1] == frame[1] && w->frame[2] == frame[2]) {
@@ -388,7 +390,7 @@ gboolean hinawa_fw_fcp_avc_transaction_with_tstamp(HinawaFwFcp *self,
 				      NULL);
 
 	g_mutex_lock(&priv->transactions_mutex);
-	priv->transactions = g_list_append(priv->transactions, &w);
+	LIST_INSERT_HEAD(&priv->transactions, &w, list);
 	g_mutex_unlock(&priv->transactions_mutex);
 
 	// Finish transaction for command frame.
@@ -416,7 +418,7 @@ gboolean hinawa_fw_fcp_avc_transaction_with_tstamp(HinawaFwFcp *self,
 	}
 
 	g_mutex_lock(&priv->transactions_mutex);
-	priv->transactions = g_list_remove(priv->transactions, &w);
+	LIST_REMOVE(&w, list);
 	g_mutex_unlock(&priv->transactions_mutex);
 
 	g_signal_handler_disconnect(self, handler_id);
@@ -505,15 +507,11 @@ static HinawaFwRcode handle_requested_signal(HinawaFwResp *resp, HinawaFwTcode t
 static void handle_bus_update_signal(HinawaFwNode *node, HinawaFwFcp *self)
 {
 	HinawaFwFcpPrivate *priv = hinawa_fw_fcp_get_instance_private(self);
-	GList *entry;
+	struct waiter *w;
 
 	g_mutex_lock(&priv->transactions_mutex);
 
-	for (entry = g_list_first(priv->transactions);
-	     entry != NULL;
-	     entry = g_list_next(priv->transactions)) {
-		struct waiter *w = (struct waiter *)entry->data;
-
+	LIST_FOREACH(w, &priv->transactions, list) {
 		g_mutex_lock(&w->mutex);
 		w->state = WAITER_STATE_ABORTED;
 		g_cond_signal(&w->cond);
@@ -547,7 +545,7 @@ gboolean hinawa_fw_fcp_bind(HinawaFwFcp *self, HinawaFwNode *node, GError **erro
 
 	if (priv->node == NULL) {
 		g_mutex_lock(&priv->transactions_mutex);
-		g_list_free(priv->transactions);
+		LIST_INIT(&priv->transactions);
 		g_mutex_unlock(&priv->transactions_mutex);
 
 		if (!hinawa_fw_resp_reserve(HINAWA_FW_RESP(self), node, FCP_RESPOND_ADDR,
@@ -574,7 +572,7 @@ gboolean hinawa_fw_fcp_bind(HinawaFwFcp *self, HinawaFwNode *node, GError **erro
 void hinawa_fw_fcp_unbind(HinawaFwFcp *self)
 {
 	HinawaFwFcpPrivate *priv;
-	GList *entry;
+	struct waiter *w;
 
 	g_return_if_fail(HINAWA_IS_FW_FCP(self));
 	priv = hinawa_fw_fcp_get_instance_private(self);
@@ -589,11 +587,7 @@ void hinawa_fw_fcp_unbind(HinawaFwFcp *self)
 
 	g_mutex_lock(&priv->transactions_mutex);
 
-	for (entry = g_list_first(priv->transactions);
-	     entry != NULL;
-	     entry = g_list_next(priv->transactions)) {
-		struct waiter *w = (struct waiter *)entry->data;
-
+	LIST_FOREACH(w, &priv->transactions, list) {
 		g_mutex_lock(&w->mutex);
 
 		if (w->state == WAITER_STATE_PENDING) {