[issue19478] Add ability to prefix posix semaphore names created by multiprocessing module

[Marc Liyanage]

Marc Liyanage added the comment:

I'm thinking something along the lines of

    char *env = Py_GETENV("PYTHONSEMAPHOREPREFIX");
    if (env && *env != '\0') {
        PyOS_snprintf(buffer, sizeof(buffer), "%s/mp%ld-%d", env, 
(long)getpid(), counter++);
    } else {
        PyOS_snprintf(buffer, sizeof(buffer), "/mp%ld-%d", (long)getpid(), 
counter++);
    }

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<http://bugs.python.org/issue19478>
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