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- The Main Event Loop — manages all available sources of events
- Threads — portable support for threads, mutexes, locks, conditions and thread private data
- Thread Pools — pools of threads to execute work concurrently
- Asynchronous Queues — asynchronous communication between threads
- Dynamic Loading of Modules — portable method for dynamically loading 'plug-ins'
- Memory Allocation — general memory-handling
- Memory Slices — efficient way to allocate groups of equal-sized chunks of memory
- IO Channels — portable support for using files, pipes and sockets
- Error Reporting — a system for reporting errors
- Warnings and Assertions — warnings and assertions to use in runtime code
- Message Output and Debugging Functions — functions to output messages and help debug applications