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Split semaphore classes into Semaphore and NamedSemaphore Semaphore is implemented with Grand Central Dispatch NamedSemaphore uses the spin lock approach like in boost for sem_timedwait sem_getvalue is not supported on MacOS and therefore was removed Fixed bug (*gatewayaddress_len > 0) in MQTTSNSearchClient.c Signed-off-by: Jochen Wilhelmy <jochen.wilhelmy@gmail.com>