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#include <stdio.h>
#include <pthread.h>
// simulated system
struct app {
long PC;
bool simulating;
} sys;
// locks
pthread_mutex_t simulation_lock;
pthread_mutex_t application_lock;
pthread_t sim_th;
struct sim_args {
long int steps2go;
};
void
step_start(void)
{
pthread_mutex_lock(&application_lock);
}
void
step_end(void)
{
pthread_mutex_unlock(&application_lock);
}
void *
sim_thread(void *arg)
{
printf("Sim: thread started, now trying lock...\n");
pthread_mutex_lock(&simulation_lock);
printf("Sim: got lock, now run\n");
struct sim_args *args= (struct sim_args *)arg;
bool done= 0;
long steps2go= args->steps2go, steps= steps2go;
while (!done)
{
step_start();
sys.PC++;
if (steps2go > 0)
{
steps--;
if (done= steps == 0)
printf("Sim: %s steps done\n", steps2go);
}
else if (steps2go == 0)
{
}
/*else if (steps2go < 0)
{*/
if (done= !sys.simulating)
printf("Sim: requested to stop\n");
/*}*/
step_end();
}
printf("Sim: finished, releasing lock...\n");
pthread_mutex_unlock(&simulation_lock);
printf("Sim: done\n");
return(NULL);
}
void
start_command(void)
{
pthread_mutex_lock(&application_lock);
}
void
end_command(void)
{
pthread_mutex_unlock(&application_lock);
}
void
g_cmd(FILE *fin, FILE *fout)
{
start_command();
fprintf(fout, "PC=%ld, simulating=%d\n", sys.PC, sys.simulating);
end_command();
}
void
s_cmd(FILE *fin, FILE *fout)
{
start_command();
fscanf(fin, " %ld", &sys.PC);
fprintf(fout, "PC=%ld\n", sys.PC);
end_command();
}
void
start_simulation(int steps)
{
struct sim_args sargs;
sargs.steps2go= steps;
sys.simulating= 1;
pthread_attr_t ta;
pthread_attr_init(&ta);
pthread_attr_setdetachstate(&ta, PTHREAD_CREATE_DETACHED);
pthread_create(&sim_th, &ta, sim_thread, &sargs);
pthread_attr_destroy(&ta);
}
void
r_cmd(FILE *fin, FILE *fout)
{
start_command();
if (pthread_mutex_trylock(&simulation_lock) != 0)
{
fprintf(fout, "Simulation already runing\n");
}
else
{
fprintf(fout, "Run from PC=%ld\n", sys.PC);
start_simulation(-1);
pthread_mutex_unlock(&simulation_lock);
}
end_command();
}
void
S_cmd(FILE *fin, FILE *fout)
{
fprintf(fout, "Trying to get app lock...\n");
start_command();
fprintf(fout, "OK, lock is ours, set stopper flag...\n");
sys.simulating= 0;
fprintf(fout, "Release lock, to give chance of stop\n");
end_command();
fprintf(fout, "Wait for stop...\n");
pthread_mutex_lock(&simulation_lock);
fprintf(fout, "We got sim lock, so it stopped\n");
pthread_mutex_unlock(&simulation_lock);
fprintf(fout, "Stopped at PC=%ld\n", sys.PC);
}
struct input_args {
int nr;
char *fin_name;
char *fout_name;
};
void *
input_thread(void *arg)
{
struct input_args *args= (struct input_args *)arg;
FILE *fin, *fout;
if (args->fin_name)
fin= fopen(args->fin_name, "r");
else
fin= stdin;
if (args->fout_name)
fout= fopen(args->fout_name, "w");
else
fout= stdout;
bool done= 0;
while (!done)
{
char cmd[100];
fprintf(fout, "%d> ", args->nr); fflush(fout);
fscanf(fin, " %99s", &cmd[0]);
fprintf(fout, "%d Got command: %c\n", args->nr, cmd[0]);
switch (cmd[0])
{
case 'q':
done= 1;
break;
case 'g':
g_cmd(fin, fout);
break;
case 's':
s_cmd(fin, fout);
break;
case 'r':
r_cmd(fin, fout);
break;
case 'S':
S_cmd(fin, fout);
break;
default:
fprintf(fout, "%d Unknown command\n", args->nr);
break;
}
}
fprintf(fout, "%d Console finished\n", args->nr);
fclose(fin);
fclose(fout);
return(NULL);
}
int
main(int argc, char *argv[])
{
pthread_t input_th[3];
int threads= 0;
pthread_mutex_init(&simulation_lock, NULL);
pthread_mutex_init(&application_lock, NULL);
struct input_args iargs= { 0, NULL, NULL };
pthread_create(&input_th[0], NULL, input_thread, &iargs);
threads++;
if (argc > 1)
{
struct input_args iargs= { 1, argv[1], argv[1] };
pthread_create(&input_th[1], NULL, input_thread, &iargs);
threads++;
}
if (argc > 2)
{
struct input_args iargs= { 2, argv[2], argv[2] };
pthread_create(&input_th[2], NULL, input_thread, &iargs);
threads++;
}
int i;
for (i= 0; i < threads; i++)
{
void *ret;
pthread_join(input_th[i], &ret);
}
return(0);
}
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