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Dining-Philosophers ProblemlPhilosophers eat/think Eating needs 2 chopsticks Pick one chopstick at a time How to prevent deadlock *gZm Dining Philosophers Example}monitor dp { enum {thinking, hungry, eating} state[5]; condition self[5]; void pickup(int i) { state[i] = hungry; test[i]; if (state[i] != eating) wait(self[i]); } /* end pickup */ void putdown(int i) { state[i] = thinking; /* test left and right neighbors */ test((i+4) % 5); test((i+1) % 5); } /* end putdown */~~PJ C void test(int i) { if ( (state[(I + 4) % 5] != eating) && (state[i] == hungry) && (state[(i + 1) % 5] != eating)) { state[i] = eating; signal(self[i]); } } /* end test */ void init() { for (int i = 0; i < 5; i++) state[i] = thinking; } /* end init */ } /* end monitor dp */ DDP ?!The Sleeping Barber Problem"The Sleeping Barber Problem#define CHAIRS 5 int waiting = 0; /* # customers waiting */ & void barber (void) { while (TRUE) { & /* go to sleep if no customers */ waiting--; /* one less waiting */ & cut_hair(); } } /* end barber */  |void customer (void) { /* no free chairs? leave */ & if (waiting < CHAIRS) { ++waiting; /* sit down */ & get_haircut(); } else { & } } /* end customer */%The Sleeping Barber Problem}#define CHAIRS 5 int waiting = 0; /* # customers waiting */ semaphore customers = 0; semaphore barbers = 0; semaphore mutex = 1; void barber (void) { while (TRUE) { wait(customers); wait(mutex); /* go to sleep if no customers */ waiting--; /* one less waiting */ signal(barbers); signal(mutex); cut_hair(); } } /* end barber */ ~Z~PcOw0 void customer (void) { /* no free chairs? leave */ wait(mutex); if (waiting < CHAIRS) { ++waiting; /* sit down */ signal(customers); signal(mutex); wait(barbers); get_haircut(); } else { signal(mutex); } } /* end customer */>=hD  ` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!>?" dd@ ?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `$p>>   (   (    Nff??"?  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