posix sharedMem+posix mutex demo

https://github.com/tiger40490/repo1/blob/cpp1/cpp/thr/sharedMemMutex.cpp has my posix shared memory demo showing

  • parent/child processes both writing
  • pthreads mutex in mmap() shared memory

[[pthreads programming]] P 78 also has a simple yet complete code showing

  1. mutex in shmget/shmat shared memory
  2. fork() to create two processes

 

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