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/* step.c for step.exp */
#include <ipc.h>
#include <pthread.h>
#include <st.h>
#include <signal.h>
#include <stdio.h>
void alarm_handler ();
void alarm_handler1 ();
void alarm_handler2 ();
void thread1 ();
void thread2 ();
#define TIME_LIMIT 30
int count1 = 0;
int count2 = 0;
pthread_t tid1, tid2;
pthread_attr_t attr1, attr2;
pthread_mutex_t mut;
pthread_mutexattr_t mut_attr;
pthread_condattr_t cv_attr_a, cv_attr_b;
pthread_cond_t cv_a, cv_b;
struct cv_struct
{
char a;
char b;
}
test_struct;
main ()
{
/*init la struct */
test_struct.a = 0;
test_struct.b = 1;
/* create le mutex */
if (pthread_mutexattr_create (&mut_attr) == -1)
{
perror ("mutexattr_create");
exit (1);
}
if (pthread_mutex_init (&mut, mut_attr) == -1)
{
perror ("mutex_init");
exit (1);
}
/* create 2 cv */
if (pthread_condattr_create (&cv_attr_a) == -1)
{
perror ("condattr_create(1)");
exit (1);
}
if (pthread_cond_init (&cv_a, cv_attr_a) == -1)
{
perror ("cond_init(1)");
exit (1);
}
if (pthread_condattr_create (&cv_attr_b) == -1)
{
perror ("condattr_create(2)");
exit (1);
}
if (pthread_cond_init (&cv_b, cv_attr_b) == -1)
{
perror ("cond_init(2)");
exit (1);
}
/* create 2 threads of execution */
if (pthread_attr_create (&attr1) == -1)
{
perror ("attr_create(1)");
exit (1);
}
if (pthread_create (&tid1, attr1, thread1, &count1) == -1)
{
perror ("pthread_create(1)");
exit (1);
}
if (pthread_attr_create (&attr2) == -1)
{
perror ("attr_create(2)");
exit (1);
}
if (pthread_create (&tid2, attr2, thread2, &count2) == -1)
{
perror ("pthread_create(2)");
exit (1);
}
/* set alarm to print out data and exit */
signal (SIGALRM, alarm_handler);
alarm (TIME_LIMIT);
for (;;)
pause ();
}
void
thread1 (count)
int *count;
{
tid_t tid;
tid = getstid ();
printf ("Thread1 tid 0x%x (%d) \n", tid, tid);
printf ("Thread1 @tid=0x%x \n", &tid);
signal (SIGALRM, alarm_handler1);
for (;;)
{
if (pthread_mutex_lock (&mut) == -1)
{
perror ("pthread_mutex_lock(1)");
pthread_exit ((void *) 0);
}
while (test_struct.a == 0)
{
if (pthread_cond_wait (&cv_a, &mut) == -1)
{
perror ("pthread_cond_wait(1)");
pthread_exit ((void *) -1);
}
}
(*count)++;
printf ("*******thread1 count %d\n", *count);
test_struct.a = 0;
test_struct.b = 1;
pthread_cond_signal (&cv_b);
if (pthread_mutex_unlock (&mut) == -1)
{
perror ("pthread_mutex_unlock(1)");
pthread_exit ((void *) -1);
}
}
}
void
thread2 (count)
int *count;
{
tid_t tid;
tid = getstid ();
printf ("Thread2 tid 0x%x (%d) \n", tid, tid);
printf ("Thread1 @tid=0x%x \n", &tid);
signal (SIGALRM, alarm_handler2);
for (;;)
{
if (pthread_mutex_lock (&mut) == -1)
{
perror ("pthread_mutex_lock(2)");
pthread_exit ((void *) 0);
}
while (test_struct.b == 0)
{
if (pthread_cond_wait (&cv_b, &mut) == -1)
{
perror ("pthread_cond_wait(2)");
pthread_exit ((void *) -1);
}
}
(*count)++;
printf ("*******thread2 count %d\n", *count);
test_struct.b = 0;
test_struct.a = 1;
pthread_cond_signal (&cv_a);
if (pthread_mutex_unlock (&mut) == -1)
{
perror ("pthread_mutex_unlock(2)");
pthread_exit ((void *) -1);
}
}
}
void
alarm_handler ()
{
printf ("\tcount1 (%d) \n\tcount2 (%d)\n", count1, count2);
exit (0);
}
void
alarm_handler1 ()
{
printf ("ALARM thread 1\n");
}
void
alarm_handler2 ()
{
printf ("ALARM thread 2\n");
pthread_exit ((void *) 0);
}