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Multiprocessing Producer-Consumer

Demonstration of multiprocessing using two programs, producer and consumer. Start producer first.

Requirements

  1. C++17
  2. POSIX shared memory, #include <sys/mman.h>
  3. POSIX System V semaphores, #include <sys/sem.h>
  4. CMakeLists.txt
  5. README.txt file describing implementation

Producer

  1. The producer produces a random floating point number (product)
  2. Products are made at random intervals between 0.5 and 1.5 seconds each
  3. Products are numbered sequentially
  4. Numbered products are printed and then passed to the consumer
  5. For 1 out of 20 products, a product is dropped and not passed to the consumer.
  6. Products are passed in a queue protected by semaphores
  7. The queue can hold 5 products
  8. If the queue is full when a product is produced, the producer outputs "DROPPED <#>" and continues

Consumer

  1. The consumer consumes numbered products
  2. The consumer consumes products at a slower rate than the producer produces them, there may be multiple products produced before the consumer consumes the task.
  3. Products are consumed at random intervals between 1.0 and 3.0 seconds
  4. Products are printed to the screen
  5. If a product number is skipped in sequence, the consumer outputs 0.0 for that sequence number

Producer Example Output

1 0.4395116517359974 2 0.07296093346964816 3 0.23989517451159492 4 0.9214004505330191 5 0.23692077473430806 6 0.5565227807496207 7 0.3635783890022559 9 0.8505558785920253 10 0.10421790588732671 12 0.3159450030396609 13 0.13638449049289925 DROPPED 13 14 0.8564636018393292 15 0.010106680565449055

Consumer Example Output

1 0.4395116517359974 2 0.07296093346964816 3 0.23989517451159492 4 0.9214004505330191 5 0.23692077473430806 6 0.5565227807496207 7 0.3635783890022559 8 0.0 9 0.8505558785920253 10 0.10421790588732671 11 0.0 12 0.3159450030396609 13 0.0 14 0.8564636018393292 15 0.010106680565449055