added circular history buffer of past message to every path

server/include/config.h

@@ -18,9 +18,15 @@
 /** The version number of the s2ss server */
 #define VERSION		"v0.4-" _GIT_REV
 
-/** Maximum number of double values in a struct msg */
+/** Maximum number of float values in a message */
 #define MAX_VALUES	16
 
+/** Maximum number of messages in the circular history buffer */
+#define POOL_SIZE	16
+
+/** Width of log output in characters */
+#define LOG_WIDTH	100
+
 /** Socket priority */
 #define SOCKET_PRIO	7
 

server/include/log.h

@@ -16,9 +16,6 @@
  #define INDENT		;
 #endif
 
-/** Width of log output in characters */
-#define LOG_WIDTH	100
-
 /* The log level which is passed as first argument to print() */
 #define DEBUG		GRY("Debug")
 #define INFO		    "" 

server/include/path.h

@@ -42,6 +42,8 @@ struct path
 	struct msg *current;
 	/** A pointer to the previously received message */
 	struct msg *previous;
+	/** A circular buffer of past messages */
+	struct msg *history;
 	
 	/** Counter for received messages according to their sequence no displacement */
 	struct hist histogram;
@@ -94,6 +96,15 @@ int path_start(struct path *p);
  */
 int path_stop(struct path *p);
 
+
+/** Reset internal counters and histogram of a path.
+ *
+ * @param p A pointer to the path structure.
+ * @retval 0 Success. Everything went well.
+ * @retval <0 Error. Something went wrong.
+ */
+int path_reset(struct path *p);
+
 /** Show some basic statistics for a path.
  *
  * @param p A pointer to the path structure.

server/src/log.c

@@ -9,6 +9,7 @@
 
 #include "log.h"
 #include "utils.h"
+#include "config.h"
 
 /** Debug level used by the debug() macro.
  * It defaults to V (defined by the Makefile) and can be

server/src/path.c

@@ -69,10 +69,6 @@ static void * path_send(void *arg)
 static void * path_run(void *arg)
 {
 	struct path *p = arg;
-
-	p->previous = alloc(sizeof(struct msg));
-	p->current  = alloc(sizeof(struct msg));
-	
 	char buf[33];
 
 	/* Open deferred TCP connection */
@@ -81,7 +77,11 @@ static void * path_run(void *arg)
 
 	/* Main thread loop */
 	while (1) {
-		node_read(p->in, p->current); /* Receive message */
+		/* Receive message */
+		p->previous = &p->history[(p->received-1) % POOL_SIZE];
+		p->current  = &p->history[ p->received    % POOL_SIZE];
+		
+		node_read(p->in, p->current);
 		
 		p->received++;
 
@@ -125,8 +125,6 @@ static void * path_run(void *arg)
 
 			p->sent++;
 		}
-
-		SWAP(p->previous, p->current);
 	}
 
 	return NULL;
@@ -212,6 +210,8 @@ int path_print(struct path *p, char *buf, int len)
 struct path * path_create()
 {
 	struct path *p = alloc(sizeof(struct path));
+	
+	p->history = alloc(POOL_SIZE * sizeof(struct msg));
 
 	list_init(&p->destinations, NULL);
 	list_init(&p->hooks, NULL);
@@ -227,7 +227,6 @@ void path_destroy(struct path *p)
 	list_destroy(&p->hooks);
 	hist_destroy(&p->histogram);
 	
-	free(p->current);
-	free(p->previous);
+	free(p->history);
 	free(p);
 }