主从同步，实现新的更改应用到slave上，实现同步slave未上线时间的更改。

reactor.c

@@ -12,7 +12,7 @@
 #include <sys/epoll.h>
 #include <errno.h>
 #include <sys/time.h>
-
+#include <sys/eventfd.h>
 
 #include "server.h"
 
@@ -28,14 +28,17 @@
 #if ENABLE_KVSTORE
 
 // typedef int (*msg_handler)(char *msg, int length, char *response);
-typedef int (*msg_handler)(char *request, int request_length, char *response, int *response_length);
+// typedef int (*msg_handler)(char *request, int request_length, char *response, int *response_length);
+typedef int (*msg_handler)(struct conn* conn);
 
+extern int try_connect_master(char *ip, int port);
 
 static msg_handler kvs_handler;
 
 // 0 need more, -1 error, =1 suc
 int kvs_request(struct conn *c) {
-	int consumed_out = kvs_handler(c->rbuffer, c->rlength, c->wbuffer, &c->wlength);
+	// int consumed_out = kvs_handler(c->rbuffer, c->rlength, c->wbuffer, &c->wlength);
+	int consumed_out = kvs_handler(c);
 	return consumed_out; 
 }
 
@@ -59,12 +62,14 @@ int send_cb(int fd);
 int epfd = 0;
 struct timeval begin;
 
+int wakeup_fd = -1;
 
 
 struct conn conn_list[CONNECTION_SIZE] = {0};
 // fd
 
 
+// 1 add, 0 mod
 int set_event(int fd, int event, int flag) {
 
 	if (flag) {  // non-zero add
@@ -101,6 +106,8 @@ int event_register(int fd, int event) {
 	memset(conn_list[fd].wbuffer, 0, BUFFER_LENGTH);
 	conn_list[fd].wlength = 0;
 
+	conn_list[fd].is_from_master = 0;
+	
 	set_event(fd, event, 1);
 }
 
@@ -250,9 +257,17 @@ int send_cb(int fd) {
 	}
 #else
 	// printf("wlength: %d\n", conn_list[fd].wlength);
+
+	pthread_mutex_lock(&conn_list[fd].g_sync_lock);
 	if (conn_list[fd].wlength != 0) {
+		// for(int i = 0;i < conn_list[fd].wlength; ++i){
+		// 	printf("%02x", conn_list[fd].wbuffer[i]);
+		// }
+		// printf("\n");
 		count = send(fd, conn_list[fd].wbuffer, conn_list[fd].wlength, 0);
+		conn_list[fd].wlength = 0;
 	}
+	pthread_mutex_unlock(&conn_list[fd].g_sync_lock);
 	
 	set_event(fd, EPOLLIN, 0);
 
@@ -262,7 +277,43 @@ int send_cb(int fd) {
 	return count;
 }
 
+// wakup fd
 
+int handle_wakeup_fd_cb(int fd);
+
+int init_wakeup_fd(void) {
+    wakeup_fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+    if (wakeup_fd < 0) {
+        printf("eventfd failed: errno=%d %s\n", errno, strerror(errno));
+        return -1;
+    }
+
+	conn_list[wakeup_fd].fd = wakeup_fd;
+	conn_list[wakeup_fd].r_action.recv_callback = handle_wakeup_fd_cb;
+	set_event(wakeup_fd, EPOLLIN, 1);
+
+    return 0;
+}
+
+// EPOLLOUT 
+void sync_wakeup(int fd) {
+	if (wakeup_fd < 0) return;
+	set_event(fd, EPOLLOUT, 0);
+
+    uint64_t one = 1;
+    ssize_t n = write(wakeup_fd, &one, sizeof(one));
+}
+
+int handle_wakeup_fd_cb(int fd) {
+    uint64_t v;
+    while (1) {
+        ssize_t n = read(wakeup_fd, &v, sizeof(v));
+        if (n == sizeof(v)) continue;
+        if (n < 0 && errno == EAGAIN) break;   // 已经读空
+        break;
+    }
+	return 0;
+}
 
 int r_init_server(unsigned short port) {
 
@@ -284,13 +335,25 @@ int r_init_server(unsigned short port) {
 
 }
 
-int reactor_start(unsigned short port, msg_handler handler) {
+int reactor_start(unsigned short port, msg_handler handler, char *m_ip, int m_port) {
 
 	//unsigned short port = 2000;
 	kvs_handler = handler;
 
 	epfd = epoll_create(1);
 
+	if(init_wakeup_fd() < 0){
+		close(epfd);
+		return -1;
+	}
+
+	// slave
+	if(m_ip != NULL){
+		int masterfd = try_connect_master(m_ip, m_port);
+		event_register(masterfd, EPOLLIN);
+		conn_list[masterfd].is_from_master = 1;
+	}
+
 	int i = 0;
 
 	for (i = 0;i < MAX_PORTS;i ++) {
@@ -299,7 +362,8 @@ int reactor_start(unsigned short port, msg_handler handler) {
 		
 		conn_list[sockfd].fd = sockfd;
 		conn_list[sockfd].r_action.recv_callback = accept_cb;
-		
+		conn_list[sockfd].is_from_master = 0;
+
 		set_event(sockfd, EPOLLIN, 1);
 	}
 
@@ -335,7 +399,9 @@ int reactor_start(unsigned short port, msg_handler handler) {
 
 	}
 	
-
+	if (wakeup_fd >= 0) close(wakeup_fd);
+	if (epfd >= 0) close(epfd);
+	return 0;
 }