99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
// worker.c
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#define _GNU_SOURCE
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#include <errno.h>
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#include <mqueue.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include "common.h"
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static void msleep(int ms) {
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struct timespec ts = {.tv_sec = ms / 1000, .tv_nsec = (ms % 1000) * 1000000L};
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nanosleep(&ts, NULL);
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}
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int main(int argc, char **argv) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <bee_portion>\n", argv[0]);
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return 2;
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}
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int portion = atoi(argv[1]);
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if (portion <= 0) {
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fprintf(stderr, "portion must be >0\n");
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return 2;
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}
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pid_t me = getpid();
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char replyq[NAME_MAXLEN];
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snprintf(replyq, sizeof(replyq), "/bee_%d", (int) me);
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mq_unlink(replyq);
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struct mq_attr attr;
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memset(&attr, 0, sizeof(attr));
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attr.mq_maxmsg = 10; // также укладываемся в лимит
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attr.mq_msgsize = sizeof(rep_msg_t);
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mqd_t qrep = mq_open(replyq, O_CREAT | O_RDONLY, 0666, &attr);
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if (qrep == (mqd_t) -1) {
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perror("mq_open reply");
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return 1;
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}
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mqd_t qreq = (mqd_t) -1;
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for (int i = 0; i < 50; i++) {
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qreq = mq_open(REQ_QUEUE, O_WRONLY);
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if (qreq != (mqd_t) -1) break;
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if (errno != ENOENT) {
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perror("mq_open req");
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break;
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}
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msleep(100);
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}
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if (qreq == (mqd_t) -1) {
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perror("mq_open req");
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mq_close(qrep);
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mq_unlink(replyq);
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return 1;
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}
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unsigned seed = (unsigned) (time(NULL) ^ (uintptr_t) me);
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while (1) {
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int ms = 100 + (rand_r(&seed) % 600);
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msleep(ms);
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req_msg_t req;
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memset(&req, 0, sizeof(req));
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req.pid = me;
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req.want = portion;
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strncpy(req.replyq, replyq, sizeof(req.replyq) - 1);
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if (mq_send(qreq, (const char *) &req, sizeof(req), 0) == -1) {
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perror("mq_send");
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break;
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}
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rep_msg_t rep;
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ssize_t rd = mq_receive(qrep, (char *) &rep, sizeof(rep), NULL);
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if (rd == -1) {
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perror("mq_receive");
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break;
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}
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if (rep.granted <= 0) {
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break;
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}
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dprintf(STDOUT_FILENO, "Bee %d got %d, remain %d\n", (int) me, rep.granted, rep.remain);
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}
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mq_close(qreq);
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mq_close(qrep);
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mq_unlink(replyq);
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return 0;
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}
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