From e171b4e3f0cc62dd2187ec499fdeaa70606c3377 Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Tue, 18 Aug 2015 20:29:16 +0200
Subject: [PATCH] Fixed usages of SYS_SEM_NULL after using pointers everywhere

---
 src/api/api_lib.c | 6 +++---
 src/api/api_msg.c | 2 +-
 src/api/tcpip.c   | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/api/api_lib.c b/src/api/api_lib.c
index 21db1355..b36eefeb 100644
--- a/src/api/api_lib.c
+++ b/src/api/api_lib.c
@@ -870,17 +870,17 @@ netconn_gethostbyname(const char *name, ip_addr_t *addr)
 void netconn_thread_init(void)
 {
   sys_sem_t *sem = LWIP_NETCONN_THREAD_SEM_GET();
-  if (sem == SYS_SEM_NULL) {
+  if (!sys_sem_valid(sem)) {
     /* call alloc only once */
     LWIP_NETCONN_THREAD_SEM_ALLOC();
-    LWIP_ASSERT("LWIP_NETCONN_THREAD_SEM_ALLOC() failed", LWIP_NETCONN_THREAD_SEM_GET() != SYS_SEM_NULL);
+    LWIP_ASSERT("LWIP_NETCONN_THREAD_SEM_ALLOC() failed", sys_sem_valid(LWIP_NETCONN_THREAD_SEM_GET()));
   }
 }
 
 void netconn_thread_cleanup(void)
 {
   sys_sem_t *sem = LWIP_NETCONN_THREAD_SEM_GET();
-  if (sem != SYS_SEM_NULL) {
+  if (sys_sem_valid(sem)) {
     /* call free only once */
     LWIP_NETCONN_THREAD_SEM_FREE();
   }
diff --git a/src/api/api_msg.c b/src/api/api_msg.c
index 6569c043..71c8d510 100644
--- a/src/api/api_msg.c
+++ b/src/api/api_msg.c
@@ -415,7 +415,7 @@ err_tcp(void *arg, err_t err)
       LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
       conn->current_msg->err = err;
       op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg);
-      LWIP_ASSERT("inavlid op_completed_sem", op_completed_sem != SYS_SEM_NULL);
+      LWIP_ASSERT("inavlid op_completed_sem", sys_sem_valid(op_completed_sem));
       conn->current_msg = NULL;
       /* wake up the waiting task */
       NETCONN_SET_SAFE_ERR(conn, err);
diff --git a/src/api/tcpip.c b/src/api/tcpip.c
index 31d5bb46..34ec5013 100644
--- a/src/api/tcpip.c
+++ b/src/api/tcpip.c
@@ -382,7 +382,7 @@ tcpip_apimsg(struct api_msg *apimsg)
 #if LWIP_NETCONN_SEM_PER_THREAD
     apimsg->msg.op_completed_sem = LWIP_NETCONN_THREAD_SEM_GET();
     LWIP_ASSERT("netconn semaphore not initialized",
-      apimsg->msg.op_completed_sem != SYS_SEM_NULL);
+      sys_sem_valid(apimsg->msg.op_completed_sem));
 #endif
     sys_mbox_post(&mbox, &TCPIP_MSG_VAR_REF(msg));
     sys_arch_sem_wait(LWIP_API_MSG_SEM(&apimsg->msg), 0);