diff --git a/interfaces/innerkits/c/dbinder/include/dbinder_service.h b/interfaces/innerkits/c/dbinder/include/dbinder_service.h
index 42331b8ccb23f5be500edd0371fef1b404306227..1fb32b274f2af3bc0ab4dfc658bc13d63e57217f 100644
--- a/interfaces/innerkits/c/dbinder/include/dbinder_service.h
+++ b/interfaces/innerkits/c/dbinder/include/dbinder_service.h
@@ -19,10 +19,8 @@
 #include <stdint.h>
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
 #endif
-#endif
 
 int32_t StartDBinderService(void);
 int32_t RegisterRemoteProxy(const void *name, uint32_t len, int32_t systemAbility);
@@ -30,8 +28,6 @@ int32_t MakeRemoteBinder(const void *serviceName, uint32_t nameLen, const char *
     uintptr_t binderObject, uint64_t pid, void *remoteObject);
 
 #ifdef __cplusplus
-#if __cplusplus
 }
 #endif /* __cplusplus */
-#endif /* __cplusplus */
 #endif /* DBINDER_SERVICE_H */
\ No newline at end of file
diff --git a/interfaces/innerkits/c/ipc/include/ipc_skeleton.h b/interfaces/innerkits/c/ipc/include/ipc_skeleton.h
index fb3e1da28c7460fba69080aeda627001bbf82d93..58ae84ca6203692520b01f166ef47eb2917b4cc5 100644
--- a/interfaces/innerkits/c/ipc/include/ipc_skeleton.h
+++ b/interfaces/innerkits/c/ipc/include/ipc_skeleton.h
@@ -24,9 +24,7 @@
 #include "serializer.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 enum {
@@ -78,8 +76,6 @@ int32_t MessageOptionInit(MessageOption *option);
 
 int32_t ReleaseSvc(SvcIdentity target);
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_SKELETON_H */
diff --git a/interfaces/innerkits/c/ipc/include/serializer.h b/interfaces/innerkits/c/ipc/include/serializer.h
index d09e1ab6574ffbbe8c5f6b3b19db69fd403eea1a..ed6adb3671b0431fd17b263a991eb9f6ab6b7cae 100644
--- a/interfaces/innerkits/c/ipc/include/serializer.h
+++ b/interfaces/innerkits/c/ipc/include/serializer.h
@@ -21,10 +21,8 @@
 #include <stdint.h>
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
 #endif /* __cplusplus */
-#endif /* __cplusplus */
 
 typedef struct {
     char *bufferBase;
@@ -128,9 +126,7 @@ float *ReadFloatVector(IpcIo *io, size_t *size);
 double *ReadDoubleVector(IpcIo *io, size_t *size);
 
 #ifdef __cplusplus
-#if __cplusplus
 }
 #endif /* __cplusplus */
-#endif /* __cplusplus */
 
 #endif /* OHOS_IPC_RPC_SERIALIZER_H */
diff --git a/ipc/native/c/adapter/include/rpc_os_adapter.h b/ipc/native/c/adapter/include/rpc_os_adapter.h
index 128af4f127e3bef936c39fad8f16e78e98778b70..cfe0977f9f23c854edf763de406d37c4d6bbccc9 100644
--- a/ipc/native/c/adapter/include/rpc_os_adapter.h
+++ b/ipc/native/c/adapter/include/rpc_os_adapter.h
@@ -19,17 +19,14 @@
 #include <stdint.h>
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 int32_t RpcGetPid(void);
 
 int32_t RpcGetUid(void);
+
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_OS_ADAPTER_H */
diff --git a/ipc/native/c/ipc/include/ipc_invoker.h b/ipc/native/c/ipc/include/ipc_invoker.h
index a254e8f1a25062c6ace2d88698cc793b021a7278..1b5d0b830c5df49d6aa6416044a6e7a0e6ca40f5 100644
--- a/ipc/native/c/ipc/include/ipc_invoker.h
+++ b/ipc/native/c/ipc/include/ipc_invoker.h
@@ -19,16 +19,12 @@
 #include "iremote_invoker.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 RemoteInvoker *GetIpcInvoker(void);
 void DeinitIpcInvoker(RemoteInvoker *invoker);
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_INVOKER_H */
\ No newline at end of file
diff --git a/ipc/native/c/manager/include/ipc_process_skeleton.h b/ipc/native/c/manager/include/ipc_process_skeleton.h
index 9b465aed1b1c4ea9c9461f0aec7215ca97cda1a1..6b0a2c63f9add2d807812c9a678f287cff73ecc6 100644
--- a/ipc/native/c/manager/include/ipc_process_skeleton.h
+++ b/ipc/native/c/manager/include/ipc_process_skeleton.h
@@ -24,9 +24,7 @@
 #include "utils_list.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 typedef struct {
@@ -74,8 +72,6 @@ void WaitForProxyInit(SvcIdentity *svc);
 int32_t DeleteHandle(int32_t handle);
 void ResetIpc(void);
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_PROCESS_SKELETON_H */
\ No newline at end of file
diff --git a/ipc/native/c/manager/include/ipc_thread_pool.h b/ipc/native/c/manager/include/ipc_thread_pool.h
index 5569c380eedea25d57ca779556bab40378a05abe..63bc0173851b65673f1d2d9e547d51970bb083b2 100644
--- a/ipc/native/c/manager/include/ipc_thread_pool.h
+++ b/ipc/native/c/manager/include/ipc_thread_pool.h
@@ -24,9 +24,7 @@
 #include "dbinder_types.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 enum {
@@ -69,8 +67,6 @@ RemoteInvoker *GetRemoteInvoker(void);
 void UpdateMaxThreadNum(ThreadPool *threadPool, int32_t maxThreadNum);
 
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_THRREAD_H */
\ No newline at end of file
diff --git a/ipc/native/c/manager/include/iremote_invoker.h b/ipc/native/c/manager/include/iremote_invoker.h
index 22e8ec6f315588ae242d2e5af2c535c0d5894da2..737b9b99184d164e609490d4b512987c864e5112 100644
--- a/ipc/native/c/manager/include/iremote_invoker.h
+++ b/ipc/native/c/manager/include/iremote_invoker.h
@@ -21,9 +21,7 @@
 #include "serializer.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
-#endif
 #endif /* __cplusplus */
 
 typedef struct {
@@ -46,8 +44,6 @@ typedef struct {
 RemoteInvoker *InitRemoteInvoker(int32_t proto);
 void DeinitRemoteInvoker(RemoteInvoker *invoker, int32_t proto);
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_IREMOTTE_INVOKER_H */
\ No newline at end of file
diff --git a/ipc/native/c/manager/include/rpc_log.h b/ipc/native/c/manager/include/rpc_log.h
index 35683a39c8756f932792e5ad2b49f7298e7c6c7f..45fd95b94435ba37cf6cb931e8e509114ab0b100 100644
--- a/ipc/native/c/manager/include/rpc_log.h
+++ b/ipc/native/c/manager/include/rpc_log.h
@@ -29,10 +29,8 @@
 #endif
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
 #endif
-#endif
 
 #ifndef IPCRPC_DEBUG
 #if defined(__LITEOS_M__)
@@ -110,8 +108,6 @@ typedef enum {
 void RpcLog(RpcLogModule module, RpcLogLevel level, const char *fmt, ...);
 
 #ifdef __cplusplus
-#if __cplusplus
 }
-#endif
 #endif /* __cplusplus */
 #endif /* OHOS_IPC_RPC_LOG_H */
\ No newline at end of file
diff --git a/ipc/native/c/manager/include/serializer_inner.h b/ipc/native/c/manager/include/serializer_inner.h
index ca281bbca81e1921428fc18236417d1083ffc3db..0dab8ec14e8d7192812a729e9ab382805039d7ab 100644
--- a/ipc/native/c/manager/include/serializer_inner.h
+++ b/ipc/native/c/manager/include/serializer_inner.h
@@ -19,18 +19,14 @@
 #include "serializer.h"
 
 #ifdef __cplusplus
-#if __cplusplus
 extern "C" {
 #endif /* __cplusplus */
-#endif /* __cplusplus */
 
 void *IoPush(IpcIo *io, size_t size);
 void *IoPop(IpcIo *io, size_t size);
 
 #ifdef __cplusplus
-#if __cplusplus
 }
 #endif /* __cplusplus */
-#endif /* __cplusplus */
 
 #endif /* OHOS_IPC_RPC_SERIALIZER_INNER_H */
diff --git a/ipc/native/c/manager/src/ipc_thread_pool.c b/ipc/native/c/manager/src/ipc_thread_pool.c
index 4d6b58327f045d4cefefa98692f169a2d94fd122..c886e3f4e704334707351b88b1ae4b25048bf324 100644
--- a/ipc/native/c/manager/src/ipc_thread_pool.c
+++ b/ipc/native/c/manager/src/ipc_thread_pool.c
@@ -150,6 +150,12 @@ int32_t SpawnNewThread(ThreadPool *threadPool, int32_t policy, int32_t proto)
         RPC_LOG_ERROR("get thread pool lock failed.");
         return ERR_FAILED;
     }
+    if (!(proto == IF_PROT_BINDER && threadPool->idleThreadNum > 0) &&
+        !(proto == IF_PROT_DATABUS && threadPool->idleSocketThreadNum > 0)) {
+        pthread_mutex_unlock(&threadPool->lock);
+        RPC_LOG_ERROR("thread pool is full.");
+        return ERR_INVALID_PARAM;
+    }
     ThreadContext *threadContext = (ThreadContext *)calloc(1, sizeof(ThreadContext));
     if (threadContext == NULL) {
         pthread_mutex_unlock(&threadPool->lock);
@@ -178,15 +184,16 @@ int32_t SpawnNewThread(ThreadPool *threadPool, int32_t policy, int32_t proto)
 void UpdateMaxThreadNum(ThreadPool *threadPool, int32_t maxThreadNum)
 {
     int32_t totalNum = maxThreadNum + maxThreadNum;
+    if (pthread_mutex_lock(&threadPool->lock) != 0) {
+        RPC_LOG_ERROR("get thread pool lock failed.");
+        return;
+    }
     int32_t oldThreadNum = threadPool->maxThreadNum;
     if (totalNum <= oldThreadNum) {
+        pthread_mutex_unlock(&threadPool->lock);
         RPC_LOG_ERROR("not support set lower max thread num.");
         return;
     }
-    if (pthread_mutex_lock(&threadPool->lock) != 0) {
-        RPC_LOG_ERROR("get thread pool lock failed.");
-        return;
-    }
     int32_t diff = totalNum - oldThreadNum;
     threadPool->maxThreadNum = totalNum;
     threadPool->idleThreadNum += diff / PROTO_NUM;