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copied!<p>Yes, this is possible. Indeed, this possibility is one of the main reasons why <code>pthread_detach()</code> exists. From the POSIX docs for <code>pthread_detach()</code> (see <code>man pthread_detach</code>):</p> <pre><code> It has been suggested that a "detach" function is not necessary; the detachstate thread creation attribute is sufficient, since a thread need never be dynamically detached. However, need arises in at least two cases: 1. In a cancellation handler for a pthread_join() it is nearly essen- tial to have a pthread_detach() function in order to detach the thread on which pthread_join() was waiting. Without it, it would be necessary to have the handler do another pthread_join() to attempt to detach the thread, which would both delay the cancella- tion processing for an unbounded period and introduce a new call to pthread_join(), which might itself need a cancellation handler. A dynamic detach is nearly essential in this case. 2. In order to detach the "initial thread" (as may be desirable in processes that set up server threads). </code></pre> <p>So what you're proposing is fine according to the standards.</p> <p><strong>Edit:</strong> Just to confirm that further, the <a href="http://pubs.opengroup.org/onlinepubs/009695399/functions/exec.html" rel="nofollow noreferrer">POSIX description of <code>exec()</code></a> states:</p> <blockquote> <p>The initial thread in the new process image shall be joinable, as if created with the detachstate attribute set to PTHREAD_CREATE_JOINABLE.</p> </blockquote>

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