Lasujcie sie razem ze mna
#include
#include
#include
#include
#include
#include
#include "err.h"
#define MAX_DATA 64*1024
#define MAX_NMESG 4096
#define MAX_NIDS 4096
int max_mesg;
struct mymesg {
long type;
char data[MAX_DATA]
} mesg;
int main(int argc, char **argv)
{
int i, j, msqid, qid[MAX_NIDS]
if ((msqid = msgget(IPC_PRIVATE, 0666 | IPC_CREAT)) == -1)
syserr("msgget1")
mesg.type = 1;
for (i = MAX_DATA; i > 0; i -= 4) {
if (msgsnd(msqid, &mesg, i, 0) == 0) {
printf("max danej =
n;", i)
max_mesg = i;
break;
}
if (errno != EINVAL)
syserr("msgsnd, length %d", i)
}
if (i == 0)
syserr("i == 0")
if (msgctl(msqid, IPC_RMID, NULL) == -1)
syserr("msgctl1")
mesg.type = 1;
for (i = 8; i <= max_mesg; i *= 2) {
if ((msqid = msgget(IPC_PRIVATE, 0666 | IPC_CREAT)) == -1)
syserr("msgget2")
for (j = 0; j < MAX_NMESG; j++) {
if (msgsnd(msqid, &mesg, i, IPC_NOWAIT) != 0) {
if (errno == EAGAIN)
break;
syserr("msgsnd, i = %d, j = %d", i, j)
break;
}
}
printf("M M-bajty,", j, i)
printf(" %d bajtown", i*j)
if (msgctl(msqid, IPC_RMID, NULL) == -1)
syserr("msgctl2")
}
mesg.type = 1;
for (i = 0; i <= MAX_NIDS; i++) {
if ((qid[i] = msgget(IPC_PRIVATE, 0666 | IPC_CREAT)) == -1) {
printf("%d identifiers open at oncen", i)
break;
}
}
for (j = 0; j < i; j++)
if (msgctl(qid[j], IPC_RMID, NULL) == -1)
syserr("msgctl3 j = %d", j)
exit(0)
}
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