__ucontext.md

# \_\_ucontext
## **Overview**
**Related Modules:**
[IPC](zh-cn_topic_0000001054718071.md)
**Description:**
Describes the user execution context.
## **Summary**
## Data Fields

Variable Name	Description
uc_flags	unsigned long
uc_link	struct __ucontext *
uc_stack	stack_t
uc_mcontext	mcontext_t
uc_sigmask	sigset_t
uc_regspace [64]	unsigned long long

## **Details**
## **Field Documentation**
## uc\_flags
```
unsigned long __ucontext::uc_flags
```
**Description:**
Flag
## uc\_link
```
struct [__ucontext](__ucontext.md)* __ucontext::uc_link
```
**Description:**
Context linked-list
## uc\_mcontext
```
mcontext_t __ucontext::uc_mcontext
```
**Description:**
Related signal context
## uc\_regspace
```
unsigned long long __ucontext::uc_regspace[64]
```
**Description:**
User register space
## uc\_sigmask
```
sigset_t __ucontext::uc_sigmask
```
**Description:**
User signal mask
## uc\_stack
```
[stack_t](zh-cn_topic_0000001054718071.md#ga395f9ff4025fe05bb535322593abde72) __ucontext::uc_stack
```
**Description:**
User stack