IPC -> INTER-PROCESSUS COMMUNICATIONS

all details and benchmark in the PDF file : Rapport Projet System M1.pdf

a popular exemple of POSIX IPC is -> mqueue.h

ATOMIC CIRCULAR-BUFFER Message queue IMPLEMENTATIONS (UNIX)

• Custom Atomic Guaranteed limit
• Thread Safe ( Multiprocessing or Multithreading)
• Blocking read,write,write_eof
• Non Blocking read,write,write_eof

• Vectored read,write

• Compliant operations (try to read or write as far as ask by user while respecting atomic limit and blocking mode)

• Message queue can be anonymous or maped in a file
• Code Correctness (All systemCall and Mutex Operations return values are tested)

IMPLEMENTATIONS

1 ) conduct.c is not concurrent and not lock-free

- The define MODE_MEMCPY at TRUE use the memcpy function from standard C library  else it don't

2) concurrentconduct.c is concurrent and not lock-free (Writer and Reader can use at the same time the Circular-Buffer)

- It use ATOMIC OPERATIONS
- There is 2 implementation possible :
    MPMC ->  multiple producer multiple consumer solutions
    SPSC ->  single producer single consumer solutions

COMPILATION

make 
without argument , compile the test FILES with the not concurrent implementation of conducts
make conc
with argument "conc" , compile the test FILES with the concurrent implementation of conducts

TEST FILES

- julia

#define MODE_FILE 1        named file mode
#define MODE_BLOCK 1    mode blocking

- test_3thread_depedency launch 3 type of threads with 2 shared conduct

threads ORDER write in Conduct 1 || threads WORKER read in Conduct 1 and after write in conduct 2 || threads RESULT read Conduct 2
#define QSIZE 100          the number of oder per threads
#define MODE_COND 1        mode conduct is activate , others are not
#define MODE_PIPE 0
#define MODE_SOCKET 0

- test_vectored_IO

- test_simple

POSSIBLE IMPROVEMENT

- Robust Mutex
- Signals corectness

strace -c -f ./julia
time ./julia

Benchmark

more details in the PDF file