BloombergLP::bslmt::ThreadUtil::createKey

Load into the specified key a new process‐wide identifier that can be used to store (via setSpecific) and retrieve (via getSpecific) a pointer value local to each thread, and associate with the new key the specified threadKeyCleanupFunction, which will be called by each thread, if threadKeyCleanupFunction is non‐zero and the value associated with key for that thread is non‐zero, with the associated value as an argument, after the function passed to create has returned and before the thread terminates. Return 0 on success, and a non‐zero value otherwise. Note that multiple keys can be defined, which can result in multiple thread key cleanup functions being called for a given thread.