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Removing a DeadLock case in dining-philosophers.c #2

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Removing a DeadLock case in dining-philosophers.c #2

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15 changes: 10 additions & 5 deletions Process Synchronization/dining-philosophers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,15 @@ void *thinkEatRepeat(int i)

printf("%d eating...\n",i+1 );
sleep(1);

pthread_mutex_unlock(&chopsticks[i]);
pthread_mutex_unlock(&chopsticks[(i+1)%n]);


if(i!=n){
pthread_mutex_unlock(&chopsticks[i]);
pthread_mutex_unlock(&chopsticks[(i+1)%n]);
}
else{ //It handles the case when all philosphers pick the chopstick to their right which will result in a deadlock
pthread_mutex_unlock(&chopsticks[i]);
pthread_mutex_unlock(&chopsticks[(i-1)%n]);
}
printf("\t%d Finished eating\n", i+1);

return NULL;
Expand All @@ -48,4 +53,4 @@ int main()
{
pthread_mutex_destroy(&chopsticks[i]);
}*/
}
}