How can I block a pthread to print a global variable from main and then continue the pthread?

Depending on your platform, unnamed semaphores may not be supported. The following would work in that case, though you may want to create temp names and use them later for the unlinks. The only reason I'm familiar with this is because the platform I normally work on, OS X, does not support unnamed semaphores through 10.8.3, and thus sans-error-checking I have similar behavior your seeing with your code because all the semaphore APIs fail.

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