TEMP_FAILURE_RETRY 宏

The GNU library provides a convenient way to retry a call after a temporary failure, with the macro TEMP_FAILURE_RETRY: — Macro: TEMP_FAILURE_RETRY (expression)

This macro evaluates expression once, and examines its value as type long int. If the value equals -1, that indicates a failure and errno should be set to show what kind of failure. If it fails and reports error code EINTR, TEMP_FAILURE_RETRY evaluates it again, and over and over until the result is not a temporary failure. The value returned by TEMP_FAILURE_RETRY is whatever value expression produced.

/* Used to retry syscalls that can return EINTR. */ #define TEMP_FAILURE_RETRY(exp) ({         \     typeof (exp) _rc;                      \     do {                                   \         _rc = (exp);                       \     } while (_rc == -1 && errno == EINTR); \     _rc; })

ps 图灵课堂老师从近一百套最新一线互联网公司面试题中精选而出，涵盖Java架构面试 所有技术栈，包括JVM，Mysql，并发，Spring，Redis，MQ，Zookeeper，Netty， Dubbo，Spring Boot，Spring Cloud，数据结构与算法，设计模式等相关技术领域的大 厂面试题及详解。 详情咨询客服获取全套面经试题。