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Date:      Mon, 1 Jun 2009 18:33:42 +0300
From:      Vlad Galu <dudu@dudu.ro>
To:        freebsd-stable@freebsd.org
Subject:   Unnamed POSIX shared semaphores
Message-ID:  <ad79ad6b0906010833y20042080td1ebe0d3bfffbdc5@mail.gmail.com>
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Hello,

According to sem_init(3), we can't have shared unnamed semaphores.
However, the following code snippet seems to work just  fine:

-- cut here --
        sem_t semaphore;
        if (sem_init(&semaphore, 1, 10) < 0)
                std::cout << "Couldn't init semaphore: " <<
strerror(errno) << std::endl;
        if (sem_wait(&semaphore) < 0)
                std::cout << "Couldn't decrement semaphore: " <<
strerror(errno) << std::endl;
        int val;
        sem_getvalue(&semaphore, &val);
        std::cout << "Value is " << val << std::endl;
-- and here --

Is this a case where sem_init() silently reports success, or should be
the man page get an update?

Thanks,
Vlad

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