I know <code>_r</code> suffix is used to indicate something thread-safe. For example <code>strtok</code> and <code>strtok_r</code> or <code>libmysql.so</code> and <code>libmysql_r.so</code>. But I cannot find anywhere what this actually means ? For example, <code>_t</code> means 'type' and what does <code>_r</code> suffix mean?

See Chapter <code>A.4.16 Thread-Safety</code> in http://pubs.opengroup.org/onlinepubs/000095399/xrat/xbd_chap04.html: <blockquote> The suffix "_r" is historical, where the 'r' stood for "reentrant". </blockquote>

The <code>_r</code> suffix stands for reentrant.

What does _r suffix mean?

Tags:

c++

c

typing

I know _r suffix is used to indicate something thread-safe. For example strtok and strtok_r or libmysql.so and libmysql_r.so. But I cannot find anywhere what this actually means ? For example, _t means 'type' and what does _r suffix mean?