sem_t.md - Openharmony v1.0 / docs / api / api-SmartVision-Devices - 最全华为鸿蒙分布式操作系统技术资料库，手册，指南

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sem_t.md

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# sem\_t
## **Overview**
**Related Modules:**
[IPC](IPC.md)
**Description:**
Defines semaphores.
This structure is used to store semaphores.
## **Summary**
## Data Fields

Variable Name	Description
__val [4 *sizeof(long)/sizeof(int)]	volatile int

## **Details**
## **Field Documentation**
## \_\_val
```
volatile int sem_t::__val[4 *sizeof(long)/sizeof(int)]
```
**Description:**
Number of semaphores