Using shared memory communication between multi-threading. Derived from sub-thread after main thread is in sleep mode, waiting for the end of the child issued by the end of the thread wake-up signal. After being awakened, the main thread to the end of the output information on the screen! Thread A writes to the shared memory, A ~ Z of the capital letters. Thread B through shared memory to receive these letters, and save it to/test.dat file. Note that the synchronization between threads mutually exclusive!

example
.......\Makefile
.......\shm_thread.c

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