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    <p>You can use Boost.Thread's <a href="http://www.boost.org/doc/libs/1_47_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref" rel="nofollow">condition variables</a> to synchronize on a condition more complex than what <code>join</code> can provide. Here's a example based on yours:</p> <pre><code>#include &lt;iostream&gt; #include &lt;boost/thread.hpp&gt; #include &lt;boost/thread/locks.hpp&gt; #include &lt;boost/thread/mutex.hpp&gt; #include &lt;boost/thread/condition_variable.hpp&gt; boost::mutex mutex; boost::condition_variable cond; // These three variables protected by mutex bool finishedFlag = false; int finishedID = 0; int finishedCount = 0; int id=1; void temp() { int threadID = id++; for(int i=0;i&lt;3;i++) { std::cout &lt;&lt; threadID &lt;&lt; " : " &lt;&lt; i &lt;&lt; std::endl; boost::this_thread::sleep(boost::posix_time::millisec(100)); } { boost::lock_guard&lt;boost::mutex&gt; lock(mutex); finishedFlag = true; finishedID = threadID; ++finishedCount; } cond.notify_one(); } int main(void) { boost::thread thrd1(temp); boost::this_thread::sleep(boost::posix_time::millisec(300)); boost::thread thrd2(temp); boost::thread thrd3(temp); boost::unique_lock&lt;boost::mutex&gt; lock(mutex); while (finishedCount &lt; 3) { while (finishedFlag != true) { // mutex is released while we wait for cond to be signalled. cond.wait(lock); // mutex is reacquired as soon as we finish waiting. } finishedFlag = false; if (finishedID == 1) { // Do something special about thrd1 finishing std::cout &lt;&lt; "thrd1 finished" &lt;&lt; std::endl; } }; // All 3 threads finished at this point. return 0; } </code></pre>
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