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# pthread\_rwlockattr\_getpshared.3

`pthread_rwlockattr_getpshared` — 获取进程共享属性

## 名称

`pthread_rwlockattr_getpshared`

## 库

libpthread

## 概要

```c
#include <pthread.h>

int
pthread_rwlockattr_getpshared(
    const pthread_rwlockattr_t *restrict attr,
    int *restrict pshared)
```

## 描述

`pthread_rwlockattr_getpshared` 函数用于获取读写锁属性对象的进程共享设置。该设置通过 `pshared` 返回，可能为以下两个值之一：

**`PTHREAD_PROCESS_SHARED`** 任何进程的任何线程，只要能访问读写锁所在的内存，都可以操作该锁。

**`PTHREAD_PROCESS_PRIVATE`** 只有在与初始化读写锁的线程同一进程内创建的线程才能操作该锁。此为默认值。

## 返回值

如果成功，`pthread_rwlockattr_getpshared` 函数将返回零。否则将返回一个错误号以指示错误。

## 错误

`pthread_rwlockattr_getpshared` 函数可能在以下情况失败：

**`[EINVAL]`** 由 `attr` 指定的值无效。

## 参见

[pthread\_rwlock\_init(3)](https://github.com/FreeBSD-Ask/freebsd-man-sc/blob/main/man3/pthread_rwlock_init.3.md), [pthread\_rwlockattr\_init(3)](/man/pthread/pthread_rwlockattr_init.3.md), [pthread\_rwlockattr\_setpshared(3)](/man/pthread/pthread_rwlockattr_setpshared.3.md)

## 标准

`pthread_rwlockattr_getpshared` 函数预期符合 ISO/IEC 9945-1:1996 ("POSIX.1") 规范。

## 历史

`pthread_rwlockattr_getpshared` 函数首次出现于 FreeBSD 3.0。


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