在QNX上使用信号量进行进程通信

本示例展示如何在QNX操作系统中使用信号量进行进程间通信，实现同步和互斥。

#include <stdio.h>
#include <stdlib.h>
#include <sys/neutrino.h>
#include <sys/syspage.h>

int main(int argc, char *argv[]) {
    int chid;
    int rcvid;
    struct _msg_info msg_info;
    struct sigevent sig;

    chid = ChannelCreate(0);
    if(chid == -1) {
        perror("ChannelCreate");
        exit(EXIT_FAILURE);
    }

    sig.sigev_notify = SIGEV_PULSE;
    sig.sigev_coid = ConnectAttach(ND_LOCAL_NODE, 0, chid, _NTO_SIDE_CHANNEL, 0);
    if(sig.sigev_coid == -1) {
        perror("ConnectAttach");
        exit(EXIT_FAILURE);
    }

    int sem = sem_open("/mysemaphore", O_CREAT, S_IRWXU, 1);
    if(sem == SEM_FAILED) {
        perror("sem_open");
        exit(EXIT_FAILURE);
    }

    while(1) {
        sem_wait(sem);
        rcvid = MsgReceive(chid, NULL, 0, &msg_info);
        if(rcvid == -1) {
            perror("MsgReceive");
            exit(EXIT_FAILURE);
        }

        printf("Pulsed!\n");

        sem_post(sem);
    }

    return EXIT_SUCCESS;
}

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