!195 feat: L0新增posix接口sem_getvalue

Merge pull request !195 from x_xiny/master

kal/posix/src/semaphore.c

@@ -186,3 +186,21 @@ int sem_timedwait(sem_t *sem, const struct timespec *timeout)
 
     return 0;
 }
+
+int sem_getvalue(sem_t *sem, int *currVal)
+{
+    UINT32 ret;
+
+    if ((sem == NULL) || (currVal == NULL)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    ret = LOS_SemGetValue(sem->s_handle, currVal);
+    if (ret) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    return LOS_OK;
+}
\ No newline at end of file

kernel/include/los_sem.h

@@ -285,6 +285,8 @@ extern UINT32 LOS_SemPend(UINT32 semHandle, UINT32 timeout);
  */
 extern UINT32 LOS_SemPost(UINT32 semHandle);
 
+extern UINT32 LOS_SemGetValue(UINT32 semHandle, INT32 *currVal);
+
 /**
  * @ingroup los_sem
  * Semaphore control structure.

kernel/src/los_sem.c

@@ -312,4 +312,16 @@ LITE_OS_SEC_TEXT UINT32 LOS_SemPost(UINT32 semHandle)
     return LOS_OK;
 }
 
+LITE_OS_SEC_TEXT UINT32 LOS_SemGetValue(UINT32 semHandle, INT32 *currVal)
+{
+    LosSemCB *sem = GET_SEM(semHandle);
+
+    if (semHandle >= (UINT32)LOSCFG_BASE_IPC_SEM_LIMIT) {
+        OS_RETURN_ERROR(LOS_ERRNO_SEM_INVALID);
+    }
+
+    *currVal = sem->semCount;
+    return 0;
+}
+
 #endif /* (LOSCFG_BASE_IPC_SEM == 1) */