?? diner.c
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//// This is a philosopher demo, using process scoping.#include <thread.h>#include <iostream>#define MAX_PHILOSOPHERS 5using namespace std;using namespace cpp_threads;int main(){ Mutex* p_fork; Semaphore* sem; bool fork_v = false; int lfork, rfork, _nr, _forks = MAX_PHILOSOPHERS, _count; Pthread::setProject( "/tmp/philosophy" ); sem = new Semaphore(attributes::process_shared_e); p_fork = new Mutex[MAX_PHILOSOPHERS](attributes::process_shared_e); if ( (_nr = sem->post()) > MAX_PHILOSOPHERS ) { sem->tryWait(); exit(0); } _count = _forks; _nr -= 1; lfork = _nr-1 >= 0 ? _nr-1 : _forks-1; rfork = lfork+1 >= _forks ? 0 : lfork+1; while(_count-- > 0) { cout << "Philosopher " << _nr << " looking for " << lfork << ',' << rfork << endl; while( fork_v == false ) { if (p_fork[lfork].tryLock() == 0) { if (p_fork[rfork].tryLock() == 0) fork_v = true; else p_fork[lfork].unLock(); } } cout << "Philosopher " << _nr << " using (" << lfork << ',' << rfork << ")\n"; sleep(2); fork_v = false; cout << "Philosopher " << _nr << ": sleeping\n"; p_fork[lfork].unLock(); p_fork[rfork].unLock(); sleep(2); } cout << _nr << " has finished dining." << endl; sem->tryWait(); return 0;}
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