diff --git a/components/libc/pthreads/pthread.h b/components/libc/pthreads/pthread.h
index dd1c5b5bd2e5f15560a1c76856050afa1ae0d10e..35fa817c0f5b2b3cf9bc21e9e5d8ff38006fa6fa 100644
--- a/components/libc/pthreads/pthread.h
+++ b/components/libc/pthreads/pthread.h
@@ -27,6 +27,7 @@
 
 #include <rtthread.h>
 #include <posix_types.h>
+#include <sched.h>
 
 #define PTHREAD_KEY_MAX             8
 
@@ -139,6 +140,11 @@ struct pthread_barrier
 };
 typedef struct pthread_barrier pthread_barrier_t;
 
+struct sched_param
+{
+    int sched_priority;
+};
+
 /* pthread thread interface */
 int pthread_attr_destroy(pthread_attr_t *attr);
 int pthread_attr_init(pthread_attr_t *attr);
@@ -146,6 +152,8 @@ int pthread_attr_setdetachstate(pthread_attr_t *attr, int state);
 int pthread_attr_getdetachstate(pthread_attr_t const *attr, int *state);
 int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
 int pthread_attr_getschedpolicy(pthread_attr_t const *attr, int *policy);
+int pthread_attr_setschedparam(pthread_attr_t *attr,struct sched_param const *param);
+int pthread_attr_getschedparam(pthread_attr_t const *attr,struct sched_param *param);
 int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stack_size);
 int pthread_attr_getstacksize(pthread_attr_t const *attr, size_t *stack_size);
 int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stack_addr);
@@ -156,7 +164,10 @@ int pthread_attr_setstack(pthread_attr_t *attr,
 int pthread_attr_getstack(pthread_attr_t const *attr,
                           void                **stack_base,
                           size_t               *stack_size);
-
+int pthread_attr_setguardsize(pthread_attr_t *attr, size_t guard_size);
+int pthread_attr_getguardsize(pthread_attr_t const *attr, size_t *guard_size);
+int pthread_attr_setscope(pthread_attr_t *attr, int scope);
+int pthread_attr_getscope(pthread_attr_t const *attr);
 int pthread_system_init(void);
 int pthread_create (pthread_t *tid, const pthread_attr_t *attr, 
     void *(*start) (void *), void *arg);
diff --git a/components/libc/pthreads/pthread_cond.c b/components/libc/pthreads/pthread_cond.c
index 25628fc2b3da510dffd2f4b2935691b5f95e286a..9349e840505e4af348b3648f06d23a32f96960d3 100644
--- a/components/libc/pthreads/pthread_cond.c
+++ b/components/libc/pthreads/pthread_cond.c
@@ -137,6 +137,9 @@ RTM_EXPORT(pthread_cond_destroy);
 int pthread_cond_broadcast(pthread_cond_t *cond)
 {
     rt_err_t result;
+
+    if (cond == RT_NULL)
+        return EINVAL;
     if (cond->attr == -1)
         pthread_cond_init(cond, RT_NULL);
 
@@ -173,6 +176,8 @@ int pthread_cond_signal(pthread_cond_t *cond)
 {
     rt_err_t result;
 
+    if (cond == RT_NULL)
+        return EINVAL;
     if (cond->attr == -1)
         pthread_cond_init(cond, RT_NULL);
 
diff --git a/components/libc/pthreads/sched.h b/components/libc/pthreads/sched.h
index 173f3eb2deadb9199d7e9d992525ee16bf5fdf4f..f0fa17bfa16421f9cec4aac161038a9b2e909688 100644
--- a/components/libc/pthreads/sched.h
+++ b/components/libc/pthreads/sched.h
@@ -37,11 +37,6 @@ enum
     SCHED_MAX = SCHED_RR
 };
 
-struct sched_param
-{
-    int sched_priority;
-};
-
 #ifdef __cplusplus
 extern "C"
 {