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copied!<p>Before all of this, I'd first make sure you're linking correctly. It seems like compiled fine, but failed at the linking step. So first make sure you actually have <code>semaphore.h</code> and that it includes <code>sem_init(...)</code>. If you do, and my guess is that you do, check your compile command. If that is your compile command in your question, try adding <code>-lpthread</code> to your compile line to link in the posix thread library.</p> <hr> <p>So you should double check that sema does what you want, since they're different libraries -- <code>sem</code> is from the POSIX <code>pthreads</code> library and <code>sema</code> is from the solaris <code>thread</code> library. (<a href="http://www.cs.cf.ac.uk/Dave/C/node29.html" rel="nofollow">See this also</a>) But if they're code compatible, and if you're looking for cross-platform compatible code, you'd probably want to do something like create simple wrapper functions and then conditionally include it.</p> <p>Your wrapper functions would be really simple, accept the same types and return the same type, e.g.</p> <pre><code>ret_type sem_init(argtype arg1, argtype arg2, argtype arg3) { return sema_init(arg1, arg2, arg3) } </code></pre> <p>And then conditionally include it with something like</p> <pre><code>#ifdef SOLARIS #include semaphore_wrappers.h #endif </code></pre> <p>Note that SOLARIS isn't going to be defined. You'll either have to manually <code>#define SOLARIS</code> when compiling on solaris, or define it in your compile command line / makefile.</p> <p>At least thats how I'd do it.</p> <p>Note that if this is <strong><em>not</em></strong> to be cross-platform compatible, it's much easier to read and debug if you just do a global search and replace.</p>

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