tommyjd93 / philosophers

Dining philosophers problem's guide for 42 school

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• 👋 Hi, I’m @TommyJD93 (Tommy)
• 🖥 I’m currently student at 42Roma Luiss
• ⌨️ I’m currently learning C, C++, Unix, Virtual machines
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philosophers's Issues

Data races and philosopher dies when we make 200 threads

Compiling with -fsanitize=thread gives the following error on the school mac

WARNING: ThreadSanitizer: data race (pid=2438)
  Write of size 4 at 0x7ffee1d15760 by thread T54 (mutexes: write M244, write M16):
    \#0 messages <null>:2 (philo:x86_64+0x1000038bc)
    #1 supervisor <null>:2 philo:x86_64+0x1000030fa)

  Previous read of size 4 at 0x7ffee1d15760 by thread T10:
    \#0 supervisor <null>:2 (philo:x86_64+0x10000306a)

  Location is stack of main thread.

  Mutex M244 (0x7ba800000c58) created at:
    \#0 pthread_mutex_init <null>:3 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2e913)
    \#1 init_philos <null>:2 (philo:x86_64+0x1000022a1)
    \#2 init <null>:2 (philo:x86_64+0x10000274e)
    \#3 main <null>:2 (philo:x86_64+0x1000019ab)

  Mutex M16 (0x7ffee1d157d8) created at:
    \#0 pthread_mutex_init <null>:3 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2e913)
    \#1 init_data <null>:2 (philo:x86_64+0x10000265d)
    \#2 init <null>:2 (philo:x86_64+0x1000026f4)
    \#3 main <null>:2 (philo:x86_64+0x1000019ab)

  Thread T54 (tid=91819, running) created by thread T53 at:
    \#0 pthread_create <null>:3 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2d8fd)
    \#1 routine <null>:2 (philo:x86_64+0x100003334)

  Thread T10 (tid=91775, running) created by thread T9 at:
    \#0 pthread_create <null>:3 (libclang_rt.tsan_osx_dynamic.dylib:x86_64h+0x2d8fd)
    \#1 routine <null>:2 (philo:x86_64+0x100003334)

SUMMARY: ThreadSanitizer: data race (philo:x86_64+0x1000038bc) in messages+0x16c
==================
ThreadSanitizer: reported 1 warnings
[1]    2438 abort      ./philo 200 800 200 200

also when running the below prompt : ./philo 200 800 200 200
a philosopher dies but he is not supposed to according to the subject.