104 lines
1.6 KiB
C
104 lines
1.6 KiB
C
/**
|
|
* @file supervisor.c
|
|
* @date 2018-05-21
|
|
*
|
|
* @brief Server program which reads solutions and orders them.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
static const char *pname;
|
|
|
|
struct circ_buf *shared;
|
|
|
|
struct sigaction sa;
|
|
|
|
static volatile sig_atomic_t quit = 0;
|
|
|
|
static void sig_handler(int signum)
|
|
{
|
|
quit = 1;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
fprintf(stderr, "SYNOPSIS\n"
|
|
"\tsupervisor\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
void initCircBuf()
|
|
{
|
|
shared->validItems = 0;
|
|
shared->head = 0;
|
|
shared->tail = 0;
|
|
shared->quit = 0;
|
|
for (int i = 0; i < MAX_ITEMS; i++) {
|
|
shared->data[i] = 0;
|
|
}
|
|
return;
|
|
}
|
|
|
|
int isEmpty()
|
|
{
|
|
if (shared->validItems == 0)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int getItem()
|
|
{
|
|
if (isEmpty())
|
|
return -1;
|
|
|
|
int value;
|
|
|
|
value = shared->data[shared->head];
|
|
shared->head = (shared->head + 1) % MAX_ITEMS;
|
|
shared->validItems--;
|
|
|
|
return value;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
if (argc != 1)
|
|
usage();
|
|
pname = argv[0];
|
|
|
|
struct sigaction sa;
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_handler = &sig_handler;
|
|
sigaction(SIGINT, &sa, NULL);
|
|
sigaction(SIGTERM, &sa, NULL);
|
|
|
|
int shmfd = shm_open(SHM_NAME, O_RDWR | O_CREAT, PERMISSION);
|
|
if (shmfd == -1) {
|
|
perror(pname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
if (ftruncate(shmfd, sizeof(*shared)) == -1) {
|
|
perror(pname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
shared = mmap(NULL, sizeof(*shared), PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
|
|
if (shared == MAP_FAILED) {
|
|
perror(pname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
sem_t *sFreeSpace = sem_open(SEM_FREE_SPACE, O_CREAT | O_EXCL, PERMISSION, MAX_ITEMS);
|
|
sem_t *sUsedSpace = sem_open(SEM_USED_SPACE, O_CREAT | O_EXCL, PERMISSION, 0);
|
|
|
|
initCircBuf();
|
|
|
|
while (quit == 0) {
|
|
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|