我编写了似乎正常工作的示例代码:
#include
#include
#include
#include
#include
struct msgbuf {
long mtype; /* message type, must be > 0 */
char mtext[1]; /* message data */
};
int main(void) {
int msqid;
//msqid = msgget(IPC_PRIVATE, (IPC_CREAT | IPC_EXCL | 0600));
msqid = msgget((key_t)1235, 0600 | IPC_CREAT);
printf("Using message queue %d\n", msqid);
struct msqid_ds buf;
int rc = msgctl(msqid, IPC_STAT, &buf);
uint msg = (uint)(buf.msg_qnum);
printf("# messages before post: %u\n", msg);
printf("Posting message to queue...\n");
struct msgbuf qmsg;
qmsg.mtype = 100;
qmsg.mtext[0] = 'T';
int res = msgsnd(msqid, &qmsg, 1, MSG_NOERROR);
rc = msgctl(msqid, IPC_STAT, &buf);
msg = (uint)(buf.msg_qnum);
printf("# messages after post: %u\n", msg);
return 0;
}
也许这会对你有所帮助?使用此代码时,队列中的消息数似乎正确递增。