int main()
{
int key = 123 ;
int memsize = sizeof(int) ;
int shmemId = open_shmem(key, memsize) ;
if (shmemId == -1) {
perror("shared segment opening error") ;
exit(EXIT_FAILURE) ;
}
int* buffer = (int*) attach_shmem(shmemId) ;
*buffer = 0 ;
int emptySemKey = 100 ;
int emptySemId = open_semaphore(emptySemKey) ;
int fullSemKey = 101 ;
int fullSemId = open_semaphore(fullSemKey) ;
if ((emptySemId == -1) || (fullSemId == -1)) {
perror("semaphore opening error") ;
exit(EXIT_FAILURE) ;
}
while (*buffer >= 0) {
down(fullSemId) ;
if (*buffer >= 0)
printf("%d\n", *buffer) ;
up(emptySemId) ;
}
detach_shmem(buffer) ;
}
int main(){
signal(SIGQUIT, quit);
signal(SIGINT, quit);
signal(SIGUSR2, priority);
signal(SIGUSR1, feux);
key_t cle_shmem = KEY_SHMEM;
key_t key_mutex = KEY_MUTEX;
if((int)(id_mutex = open_semaphore(key_mutex)) == -1) {
printf("Impossible d'ouvrir le mutex.\n");
quit();
}
if((int)(id_shmem = open_shmem(cle_shmem, shmem_size)) == -1) {
printf("Feux : Impossible d'ouvrir la mémoire partagée.\n");
quit();
}
if((int)(pshmem = attach_shmem(id_shmem)) == -1) {
printf("Feux : Impossible de s'attacher à la mémoire partagée.\n");
quit();
}
printf("PID Feux : %d\n", getpid());
down(id_mutex);
pshmem[PID_FEUX]=getpid();
up(id_mutex);
feux();
}
void attach_to_feeder_shmem() {
char path[MAXPATHLEN];
strncpy(path, config.project_dir, sizeof(path));
get_key(path, 'a', sema_key);
int i, retval;
void* p;
retval = attach_shmem(config.shmem_key, &p);
if (retval || p==0) {
log_messages.printf(MSG_CRITICAL,
"Can't attach shmem: %d (feeder not running?)\n",
retval
);
log_messages.printf(MSG_CRITICAL,
"uid %d euid %d gid %d eguid%d\n",
getuid(), geteuid(), getgid(), getegid()
);
send_message(
"Server error: feeder not running", 3600
);
exit(0);
} else {
ssp = (SCHED_SHMEM*)p;
retval = ssp->verify();
if (retval) {
log_messages.printf(MSG_CRITICAL,
"shmem has wrong struct sizes - recompile\n"
);
send_message("Server error: recompile needed", 3600);
exit(0);
}
for (i=0; i<10; i++) {
if (ssp->ready) break;
log_messages.printf(MSG_DEBUG,
"waiting for ready flag\n"
);
sleep(1);
}
if (!ssp->ready) {
log_messages.printf(MSG_CRITICAL,
"feeder doesn't seem to be running\n"
);
send_message(
"Server error: feeder not running", 3600
);
exit(0);
}
}
all_apps_use_hr = true;
for (i=0; i<ssp->napps; i++) {
if (!ssp->apps[i].homogeneous_redundancy) {
all_apps_use_hr = false;
break;
}
}
}
void generateurTrafficPrioritaire(){
key_t key_shmem = KEY_SHMEM;
key_t key_mutex = KEY_MUTEX;
if((id_mutex = open_semaphore(key_mutex)) == -1) {
printf("Impossible d'ouvrir le mutex.\n");
quit();
}
if((int)(id_shmem = open_shmem(key_shmem, shmem_size)) == -1) {
printf("generateurTrafficPrioritaire : Impossible d'ouvrir la mémoire partagée.\n");
quit();
}
if((int)(pshmem = attach_shmem(id_shmem)) == -1) {
printf("generateurTrafficPrioritaire : Impossible de s'attacher à la mémoire partagée.\n");
quit();
}
down(id_mutex);
pshmem[SRC_PRIO] = 0;
pshmem[DEST_PRIO] = 0;
pshmem[ID_PRIO] = 0;
pshmem[PID_PRIO]=getpid();
up(id_mutex);
int pid_coord = pshmem[PID_COORD];
printf("PID generPrio : %d\n", getpid());
printf("PID Coord : %d\n", pid_coord);
int timer, source, dest, id=0;
srand(time(NULL));
for(;;){
timer=rand()%26;
while(timer<15){
timer=rand()%26;
}
printf("Timer is UP: %d s\n", timer);
sleep(timer);
printf("Timer is DOWN: %d s\n", timer);
source=(rand()%4)+1;
dest=(rand()%4)+1;
while(dest==source){
dest=(rand()%4)+1;
}
down(id_mutex);
pshmem[SRC_PRIO] = source;
pshmem[DEST_PRIO] = dest;
pshmem[ID_PRIO] = id;
up(id_mutex);
kill(pid_coord, SIGUSR1);
printf("! --- PRIORITAIRE --- ! Source: %d, Dest: %d, ID :%d\n", source, dest, id);
printf("Coordinateur is notified by signal !\n");
id++;
}
}
int main() {
SCHED_SHMEM* ssp;
int retval;
void* p;
retval = config.parse_file();
if (retval) {
printf("Can't parse config.xml: %s\n", boincerror(retval));
exit(1);
}
retval = attach_shmem(config.shmem_key, &p);
if (retval) {
printf("can't attach shmem: key %x\n", config.shmem_key);
exit(1);
}
ssp = (SCHED_SHMEM*)p;
retval = ssp->verify();
ssp->show(stdout);
}
int main()
{
int key = 123 ;
int memsize = sizeof(int) ;
int shmemId = create_shmem(key, memsize) ;
if (shmemId == -1) {
perror("shared segment creation error") ;
exit(EXIT_FAILURE) ;
}
int* buffer = (int*) attach_shmem(shmemId) ;
*buffer = 0 ;
int emptySemKey = 100 ;
int emptySemId = create_semaphore(emptySemKey) ;
int fullSemKey = 101 ;
int fullSemId = create_semaphore(fullSemKey) ;
if ((emptySemId == -1) || (fullSemId == -1)) {
perror("semaphore creation error") ;
exit(EXIT_FAILURE) ;
}
init_semaphore(fullSemId, 0) ;
init_semaphore(emptySemId, 1) ;
while (*buffer >= 0) {
down(emptySemId) ;
if (!scanf("%d", buffer))
*buffer = -1 ;
up(fullSemId) ;
}
remove_semaphore(fullSemId) ;
remove_semaphore(emptySemId) ;
detach_shmem(buffer) ;
remove_shmem(shmemId) ;
}
int main(int argc, char *argv[])
{
int size = 0;
int shared_memory_key = -1;
int sem_r = -1;
int sem_w = -1;
int cnt = -1;
int buf = -1;
int *shared_memory = NULL;
errno = 0;
/* check command line arguments */
if ((size = check_arguments(argc, argv))==ERROR)
{
print_usage();
return ERROR;
}
/* get both semaphores */
if((shared_memory_key = get_shmem(SHMEMKEY, size)) == -1)
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
return ERROR;
}
attach_shmem(shared_memory_key, &shared_memory, SEMKEY_R);
if(shared_memory == NULL)
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
return ERROR;
}
/* initialize shared memory */
if((sem_r= get_semid(SEMKEY_R, 0)) == ERROR)
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
return ERROR;
}
/* attach memory to process */
if((sem_w= get_semid(SEMKEY_W, size))==ERROR)
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
return ERROR;
}
/* start the reader */
do
{
if(P(sem_r)==-1)
{
if(errno == EINTR)
{
/*EINTR sagt uns, dass ein Interrupt vorliegt. */
errno = 0;
continue;
}
else
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
fprintf(stderr, "Error bei P, reader. %s", strerror(errno));
return ERROR;
}
}
cnt++;
cnt = cnt%size;
buf = (*(shared_memory+cnt));
if(V(sem_w)==-1)
{
if(errno == EINTR)
{
/*EINTR sagt uns, dass ein Interrupt vorliegt. */
errno = 0;
continue;
}
else
{
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
fprintf(stderr, "Error bei V, reader. %s", strerror(errno));
return ERROR;
}
}
if(buf!=EOF)
{
/* Do ouput and check for Output error */
if (fputc(buf, stdout) == EOF) {
fprintf(stderr, "Fehler fputc");
clean_up(sem_r, &shared_memory, shared_memory_key, ERROR);
return ERROR;
}
}
}while(buf!=EOF);
errno = 0;
if(fflush(stdout)!=0)
{
fprintf(stderr, "fflush failed");
if(errno != 0)
{
fprintf(stderr, "%s", strerror(errno));
return ERROR;
}
}
detach_shmem(shared_memory_key,SEMKEY_R);
clean_up(sem_r, &shared_memory, shared_memory_key, SEMKEY_R);
return 0;
}