5 works needs tweking

lab_5/worker.c

@@ -0,0 +1,91 @@
+// worker.c
+#define _GNU_SOURCE
+#include <errno.h>
+#include <mqueue.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "common.h"
+
+static void msleep(int ms) {
+    struct timespec ts = { .tv_sec = ms/1000, .tv_nsec = (ms%1000)*1000000L };
+    nanosleep(&ts, NULL);
+}
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <bee_portion>\n", argv[0]);
+        return 2;
+    }
+    int portion = atoi(argv[1]);
+    if (portion <= 0) { fprintf(stderr, "portion must be >0\n"); return 2; }
+
+    pid_t me = getpid();
+    char replyq[NAME_MAXLEN];
+    snprintf(replyq, sizeof(replyq), "/bee_%d", (int)me);
+
+    // Создаём личную очередь ответов; сначала удалим старую
+    mq_unlink(replyq);
+    struct mq_attr attr;
+    memset(&attr, 0, sizeof(attr));
+    attr.mq_maxmsg = 8;
+    attr.mq_msgsize = sizeof(rep_msg_t);
+    mqd_t qrep = mq_open(replyq, O_CREAT | O_RDONLY, 0666, &attr);
+    if (qrep == (mqd_t)-1) { perror("mq_open reply"); return 1; }
+
+    // Подключаемся к очереди запросов; возможна гонка — делаем ретраи
+    mqd_t qreq = (mqd_t)-1;
+    for (int i = 0; i < 50; i++) {
+        qreq = mq_open(REQ_QUEUE, O_WRONLY);
+        if (qreq != (mqd_t)-1) break;
+        if (errno != ENOENT) { perror("mq_open req"); break; }
+        msleep(100);
+    }
+    if (qreq == (mqd_t)-1) {
+        perror("mq_open req");
+        mq_close(qrep);
+        mq_unlink(replyq);
+        return 1;
+    }
+
+    unsigned seed = (unsigned)(time(NULL) ^ (uintptr_t)me);
+
+    while (1) {
+        int ms = 100 + (rand_r(&seed) % 600); // «дорога» 100..700 мс
+        msleep(ms);
+
+        req_msg_t req = {0};
+        req.pid = me;
+        req.want = portion;
+        strncpy(req.replyq, replyq, sizeof(req.replyq)-1);
+
+        if (mq_send(qreq, (const char*)&req, sizeof(req), 0) == -1) {
+            perror("mq_send");
+            break;
+        }
+
+        rep_msg_t rep;
+        ssize_t rd = mq_receive(qrep, (char*)&rep, sizeof(rep), NULL);
+        if (rd == -1) {
+            perror("mq_receive");
+            break;
+        }
+        if (rep.granted <= 0) {
+            // Мёд закончился
+            break;
+        }
+        dprintf(STDOUT_FILENO, "Bee %d got %d, remain %d\n", (int)me, rep.granted, rep.remain);
+    }
+
+    mq_close(qreq);
+    mq_close(qrep);
+    mq_unlink(replyq);
+    return 0;
+}