diff --git a/http_server.c b/http_server.c
index 02c969b..f989742 100644
--- a/http_server.c
+++ b/http_server.c
@@ -189,8 +189,10 @@ void *accept_request(void *data)
 	int ret = -1, stat;
 	if (server_config.usessl == 1 && client->status == 0)
 	{
+		if(client->attempt > MAX_ATTEMPT) return task;
 		if (SSL_accept((SSL *)client->ssl) == -1)
 		{
+			client->attempt++;
 			stat = SSL_get_error((SSL *)client->ssl, ret);
 			switch (stat)
 			{
@@ -208,6 +210,7 @@ void *accept_request(void *data)
 				return task;
 			}
 		}
+		client->attempt = 0;
 		client->status = 1;
 		task->handle = accept_request;
 		return task;
diff --git a/http_server.h b/http_server.h
index a5b0a92..da8a30f 100644
--- a/http_server.h
+++ b/http_server.h
@@ -15,7 +15,6 @@
 #define PLUGIN_HANDLER	 "handle"
 #define WS_MAGIC_STRING	 "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
 #define MATCH(s, n) strcmp(section, s) == 0 && strcmp(name, n) == 0
-
 #define CONFIG "config.ini"
 
 config_t* config(); 
diff --git a/httpd.c b/httpd.c
index cb386e7..aeebb04 100644
--- a/httpd.c
+++ b/httpd.c
@@ -187,6 +187,7 @@ int main(int argc, char* argv[])
 #ifdef USE_OPENSSL
 		client->ssl = NULL;
 		client->status = 0;
+		client->attempt = 0;
 		if(config()->usessl == 1)
 		{
 			client->ssl = (void*)SSL_new(ctx);
diff --git a/libs/handle.c b/libs/handle.c
index 937a276..870183d 100644
--- a/libs/handle.c
+++ b/libs/handle.c
@@ -84,7 +84,7 @@ int antd_send(void *src, const void* data, int len)
 		written = 0;
 		fd_set fds;
     	struct timeval timeout;
-		while (writelen > 0)
+		while (writelen > 0 && source->attempt < MAX_ATTEMPT)
         {
             count = SSL_write (source->ssl, ptr+written, writelen);
             if (count > 0)
@@ -102,6 +102,7 @@ int antd_send(void *src, const void* data, int len)
                     {
                         // no real error, just try again...
                         //LOG("SSL_ERROR_NONE \n");
+						source->attempt++;
                         continue;
                     }   
 
@@ -125,8 +126,11 @@ int antd_send(void *src, const void* data, int len)
                         timeout.tv_usec = 500;
                         err = select(sock+1, &fds, NULL, NULL, &timeout);
                         if (err == 0 || (err > 0 && FD_ISSET(sock, &fds)))
+						{
+							source->attempt++;
                             continue; // more data to read...
-                        break;
+						}
+						break;
                     }
 
                     case SSL_ERROR_WANT_WRITE: 
@@ -142,8 +146,11 @@ int antd_send(void *src, const void* data, int len)
 
                         err = select(sock+1, NULL, &fds, NULL, &timeout);
                         if (err == 0 || (err > 0 && FD_ISSET(sock, &fds)))
+						{
+							source->attempt++;
                             continue; // can write more data now...
-                        break;
+						}
+					    break;
                     }
 
                     default:
@@ -156,6 +163,7 @@ int antd_send(void *src, const void* data, int len)
                 break;
             }
 		}
+		source->attempt = 0;
 	}
 	else
 	{
@@ -184,7 +192,7 @@ int antd_recv(void *src,  void* data, int len)
 		read = 0;
 		fd_set fds;
     	struct timeval timeout;
-		while (readlen > 0)
+		while (readlen > 0 && source->attempt < MAX_ATTEMPT)
         {
             received = SSL_read (source->ssl, ptr+read, readlen);
             if (received > 0)
@@ -202,6 +210,7 @@ int antd_recv(void *src,  void* data, int len)
                     {
                         // no real error, just try again...
                         //LOG("SSL_ERROR_NONE \n");
+						source->attempt++;
                         continue;
                     }   
 
@@ -225,8 +234,11 @@ int antd_recv(void *src,  void* data, int len)
                         timeout.tv_usec = 500;
                         err = select(sock+1, &fds, NULL, NULL, &timeout);
                         if (err == 0 || (err > 0 && FD_ISSET(sock, &fds)))
+						{
+							source->attempt++;
                             continue; // more data to read...
-                        break;
+						}
+						break;
                     }
 
                     case SSL_ERROR_WANT_WRITE: 
@@ -242,8 +254,11 @@ int antd_recv(void *src,  void* data, int len)
 
                         err = select(sock+1, NULL, &fds, NULL, &timeout);
                         if (err == 0 || (err > 0 && FD_ISSET(sock, &fds)))
+						{
+							source->attempt++;
                             continue; // can write more data now...
-                        break;
+						}
+						break;
                     }
 
                     default:
@@ -256,6 +271,7 @@ int antd_recv(void *src,  void* data, int len)
                 break;
             }
         }
+		source->attempt = 0;
 		/*
 		int stat, r, st;
 		do{
diff --git a/libs/handle.h b/libs/handle.h
index d0fa9c0..46b5400 100644
--- a/libs/handle.h
+++ b/libs/handle.h
@@ -26,7 +26,7 @@
 #define __RESULT__ "{\"result\":%d,\"msg\":\"%s\"}"
 #define FORM_URL_ENCODE  "application/x-www-form-urlencoded"
 #define FORM_MULTI_PART  "multipart/form-data"
-
+#define MAX_ATTEMPT 500
 #ifdef USE_OPENSSL
 int __attribute__((weak)) usessl();
 #endif
@@ -37,6 +37,7 @@ typedef struct{
     char* ip;
 #ifdef USE_OPENSSL
     int status;
+    int attempt;
 #endif
 } antd_client_t;
 
diff --git a/libs/scheduler.c b/libs/scheduler.c
index 97bc7cc..cb46a66 100644
--- a/libs/scheduler.c
+++ b/libs/scheduler.c
@@ -24,8 +24,8 @@ static void stop(antd_scheduler_t* scheduler)
     scheduler->status = 0;
     // unlock all idle workers if any
     for (int i = 0; i < scheduler->n_workers; i++)
-        sem_post(&scheduler->worker_sem);
-    sem_post(&scheduler->scheduler_sem);
+        sem_post(scheduler->worker_sem);
+    sem_post(scheduler->scheduler_sem);
     for (int i = 0; i < scheduler->n_workers; i++)
         if(scheduler->workers[i].id != -1)
             pthread_join(scheduler->workers[i].tid, NULL);
@@ -34,8 +34,8 @@ static void stop(antd_scheduler_t* scheduler)
     pthread_mutex_destroy(&scheduler->scheduler_lock);
     pthread_mutex_destroy(&scheduler->worker_lock);
     pthread_mutex_destroy(&scheduler->pending_lock);
-    sem_destroy(&scheduler->scheduler_sem);
-    sem_destroy(&scheduler->worker_sem);
+    sem_close(scheduler->scheduler_sem);
+    sem_close(scheduler->worker_sem);
 }
 
 static antd_task_item_t dequeue(antd_task_queue_t* q)
@@ -130,7 +130,7 @@ static void work(antd_worker_t* worker)
         if(!it)
         {
             //LOG("Worker %d goes to idle state\n", worker->id);
-            sem_wait(&scheduler->worker_sem);
+            sem_wait(scheduler->worker_sem);
         }
         else
         {
@@ -153,14 +153,16 @@ void antd_scheduler_init(antd_scheduler_t* scheduler, int n)
     scheduler->workers_queue = NULL;
     scheduler->pending_task = 0 ;
     // init semaphore
-    if (sem_init(&scheduler->scheduler_sem, 0, 0) == -1)
+    scheduler->scheduler_sem = shm_open("scheduler", O_RDWR | O_CREAT, S_IRWXU);
+    if (!scheduler->scheduler_sem)
     {
-        LOG("Cannot init semaphore for scheduler\n");
+        LOG("Cannot open semaphore for scheduler\n");
         exit(-1);
     }
-    if (sem_init(&scheduler->worker_sem, 0, 0) == -1)
+    scheduler->worker_sem = shm_open("worker", O_RDWR | O_CREAT, S_IRWXU);
+    if (!scheduler->worker_sem)
     {
-        LOG("Cannot init semaphore for workers\n");
+        LOG("Cannot open semaphore for workers\n");
         exit(-1);
     }
     // init lock 
@@ -239,7 +241,7 @@ void antd_add_task(antd_scheduler_t* scheduler, antd_task_t* task)
     scheduler->pending_task++;
     pthread_mutex_unlock(&scheduler->pending_lock);
     // wake up the scheduler if idle
-    sem_post(&scheduler->scheduler_sem);
+    sem_post(scheduler->scheduler_sem);
 }
 
 
@@ -326,7 +328,7 @@ int antd_task_schedule(antd_scheduler_t* scheduler)
         enqueue(&scheduler->workers_queue, it->task);
         pthread_mutex_unlock(&scheduler->worker_lock);
         // wake up idle worker
-        sem_post(&scheduler->worker_sem);
+        sem_post(scheduler->worker_sem);
         free(it);
     }
     return 1;
@@ -340,7 +342,7 @@ void antd_wait(antd_scheduler_t* scheduler)
         if(!stat)
         {
             // no task found, go to idle state
-            sem_wait(&scheduler->scheduler_sem);
+            sem_wait(scheduler->scheduler_sem);
         }
     }
 }
\ No newline at end of file
diff --git a/libs/scheduler.h b/libs/scheduler.h
index 4b3cc55..efcab43 100644
--- a/libs/scheduler.h
+++ b/libs/scheduler.h
@@ -64,8 +64,8 @@ typedef struct {
     pthread_mutex_t worker_lock;
     pthread_mutex_t pending_lock;
     // event handle
-    sem_t scheduler_sem;
-    sem_t worker_sem;
+    sem_t *scheduler_sem;
+    sem_t *worker_sem;
     // worker and data
     antd_task_queue_t task_queue[N_PRIORITY];
     antd_task_queue_t workers_queue;