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solution.c
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solution.c
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#include <stdio.h>
#include <wait.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include "smokers.h"
#include "offerhandlers.h"
#define PERMUTATION_TIME 3
#define SMOKING_TIME 5
void quit_all(int sig);
void meet_the_smokers(int sig);
void meet_the_agent(int sig);
pid_t agent_pid;
Smoker smoker;
int smoker_pids[3];
int smokers_ready = 0;
int main()
{
signal(SIGUSR1, meet_the_smokers);
signal(SIGINT, quit_all);
agent_pid = getpid();
printf("Agent PID: %d\n", agent_pid);
pid_t pid = fork();
if (pid == 0) {
create_smoker(&smoker, getpid(), "Smoker 1", PAPER);
} else {
smoker_pids[0] = pid;
if ((pid = fork()) == 0) {
create_smoker(&smoker, getpid(), "Smoker 2", MATCHES);
} else {
smoker_pids[1] = pid;
if ((pid = fork()) == 0) {
create_smoker(&smoker, getpid(), "Smoker 3", TOBACCO);
} else {
smoker_pids[2] = pid;
}
}
}
pid = getpid();
if (pid == agent_pid) {
smokers_ready = 1;
for (int i=0; i<3; i++) {
printf("Smoker%d PID: %d\n", i+1, smoker_pids[i]);
}
printf("\n------\n\n");
signal(SIGUSR1, meet_the_smokers);
kill(agent_pid, SIGUSR1);
} else {
signal(SIGUSR2, meet_the_agent);
}
while (1) {
sleep(10);
}
}
void meet_the_smokers(int sig) {
if (!smokers_ready) return;
CigaretteMaterial offers[2];
release_offers(offers);
printf("[Agent]: New offers are ready:\n"
"\t- %s\n\t- %s\n\n",
material_name(offers[0]), material_name(offers[1]));
fflush(stdout);
sleep(PERMUTATION_TIME);
for (int i=0; i<3; i++) {
kill(smoker_pids[i], SIGUSR2);
}
}
void meet_the_agent(int sig) {
CigaretteMaterial offers[2] = { PAPER, MATCHES };
look_offers(offers);
if (smoker.material != offers[0] && smoker.material != offers[1]) {
printf("[%s]: has the %s, is now smoking...\n", smoker.name, material_name(smoker.material));
fflush(stdout);
sleep(SMOKING_TIME);
printf("[%s]: has finished\n\n", smoker.name);
fflush(stdout);
sleep(PERMUTATION_TIME);
kill(getppid(), SIGUSR1);
}
}
void quit_all(int sig) {
kill(0, SIGQUIT);
}