<div>
When compiling code that uses threads we have to define the &nbsp;_REENTRANT macro so that the thread-safe system functions are used instead.
</div>


When compiling code that uses threads we have to define the  _REENTRANT macro so that the thread-safe system functions are used instead.

<div>
Thanks for the reply...your help was greatly appreciated!<br />
<br />
MD
</div>


Thanks for the reply...your help was greatly appreciated!

MD

<div>
<div class="content wysiwyg-content">
What are in &lt;unistd.h&gt; and &lt;stdlib.h&gt; ? &nbsp;<br />
<br />
To compile a thread on linux, we type<br />
<br />
$cc -D_REENTRANT threadprog.c -o threadprog -lpthread<br />
<br />
what does -D_REENTRANT do? &nbsp;<br />
<br />
Thanks<br />
<br />
MD<br />

</div>
</div>


What are in <unistd.h> and <stdlib.h> ?  

To compile a thread on linux, we type

$cc -D_REENTRANT threadprog.c -o threadprog -lpthread

what does -D_REENTRANT do?  

Thanks

MD


library and thread general question

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.