> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/man/pthread/pthread_mutex_lock.3.md).

# pthread\_mutex\_lock.3

`pthread_mutex_lock` — 锁定 mutex

## 名称

`pthread_mutex_lock`

## 库

libpthread

## 概要

```c
#include <pthread.h>

int
pthread_mutex_lock(pthread_mutex_t *mutex);
```

## 描述

`pthread_mutex_lock` 函数锁定 `mutex`。如果 mutex 已被锁定，调用线程将阻塞，直至 mutex 可用。

## 返回值

如果成功，`pthread_mutex_lock` 将返回零，否则返回一个错误编号以指示错误。

## 错误

`pthread_mutex_lock` 函数在以下情况下将失败：

**`[EINVAL]`** 由 `mutex` 指定的值无效。

**`[EDEADLK]`** 如果线程阻塞等待 `mutex` 将导致死锁。

**`[EOWNERDEAD]`** `mutex` 参数指向一个 robust mutex，且持有该 mutex 锁的前一线程所在进程在持有锁时终止。锁已授予调用者，由新所有者负责将状态恢复一致。

**`[ENOTRECOVERABLE]`** 由 `mutex` 保护的状态不可恢复。

## 参见

[pthread\_mutex\_consistent(3)](/man/pthread/pthread_mutex_consistent.3.md), [pthread\_mutex\_destroy(3)](/man/pthread/pthread_mutex_destroy.3.md), [pthread\_mutex\_init(3)](/man/pthread/pthread_mutex_init.3.md), [pthread\_mutex\_trylock(3)](/man/pthread/pthread_mutex_trylock.3.md), [pthread\_mutex\_unlock(3)](/man/pthread/pthread_mutex_unlock.3.md)

## 标准

`pthread_mutex_lock` 函数遵循 ISO/IEC 9945-1:1996 (“POSIX.1”) 标准。


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://book.bsdcn.org/man/pthread/pthread_mutex_lock.3.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.