5 works needs tweking

2025-11-12 16:31:36 +07:00
parent f251380639
commit 331e89fbbe
4 changed files with 302 additions and 0 deletions
--- a/lab_5/server.c
+++ b/lab_5/server.c
@@ -0,0 +1,137 @@
+// server.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 volatile sig_atomic_t stop_flag = 0;
+static void on_sigint(int) { stop_flag = 1; }
+
+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) {
+    // Аргументы: total_honey, winnie_portion, winnie_period_ms, starvation_ms
+    if (argc != 5) {
+        fprintf(stderr, "Usage: %s <total_honey> <portion> <period_ms> <starvation_ms>\n", argv[0]);
+        return 2;
+    }
+    int remain = atoi(argv[1]);
+    int portion = atoi(argv[2]);
+    int period_ms = atoi(argv[3]);
+    int starvation_ms = atoi(argv[4]);
+    if (remain < 0 || portion <= 0 || period_ms <= 0 || starvation_ms < 0) {
+        fprintf(stderr, "Bad args\n");
+        return 2;
+    }
+
+    // Очистим возможную старую очередь запросов
+    mq_unlink(REQ_QUEUE); // безопасно игнорировать ошибку, чтобы сбросить старые атрибуты
+    struct mq_attr attr;
+    memset(&attr, 0, sizeof(attr));
+    attr.mq_maxmsg = 10;                      // не превышайте /proc/sys/fs/mqueue/msg_max
+    attr.mq_msgsize = sizeof(req_msg_t);      // не превышайте /proc/sys/fs/mqueue/msgsize_max
+
+    // Создаём очередь запросов; O_RDONLY + O_CREAT, сервер читает
+    mqd_t qreq = mq_open(REQ_QUEUE, O_CREAT | O_RDONLY, 0666, &attr);
+    if (qreq == (mqd_t)-1) {
+        perror("mq_open qreq");
+        fprintf(stderr, "Hint: check /proc/sys/fs/mqueue/msg_max and msgsize_max\n");
+        return 1;
+    }
+
+    // Диагностика атрибутов очереди
+    struct mq_attr got;
+    if (mq_getattr(qreq, &got) == 0) {
+        fprintf(stderr, "Server: q=%s maxmsg=%ld msgsize=%ld cur=%ld\n",
+                REQ_QUEUE, got.mq_maxmsg, got.mq_msgsize, got.mq_curmsgs);
+    }
+
+    signal(SIGINT, on_sigint);
+    fprintf(stderr, "Server: started remain=%d portion=%d period=%dms starve=%dms\n",
+            remain, portion, period_ms, starvation_ms);
+
+    // Таймер Винни‑Пуха: потребляет мёд порциями по расписанию
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    long long next_eat_ns = (long long)now.tv_sec*1000000000LL + now.tv_nsec + (long long)period_ms*1000000LL;
+    long long last_feed_ns = (long long)now.tv_sec*1000000000LL + now.tv_nsec;
+
+    req_msg_t req;
+    while (!stop_flag) {
+        clock_gettime(CLOCK_MONOTONIC, &now);
+        long long now_ns = (long long)now.tv_sec*1000000000LL + now.tv_nsec;
+        int sleep_ms = (int)((next_eat_ns - now_ns)/1000000LL);
+        if (sleep_ms < 0) sleep_ms = 0;
+
+        // Ждём запрос до дедлайна следующего «приёма пищи»
+        struct timespec deadline = { .tv_sec = now.tv_sec + sleep_ms/1000,
+                                     .tv_nsec = now.tv_nsec + (sleep_ms%1000)*1000000L };
+        if (deadline.tv_nsec >= 1000000000L) { deadline.tv_sec++; deadline.tv_nsec -= 1000000000L; }
+
+        ssize_t rd = mq_timedreceive(qreq, (char*)&req, sizeof(req), NULL, &deadline);
+        if (rd >= 0) {
+            rep_msg_t rep;
+            if (remain > 0) {
+                int grant = req.want;
+                if (grant > remain) grant = remain;
+                remain -= grant;
+                rep.granted = grant;
+                rep.remain  = remain;
+            } else {
+                rep.granted = 0;
+                rep.remain  = 0;
+            }
+
+            // Ответ в очередь пчелы
+            mqd_t qrep = mq_open(req.replyq, O_WRONLY);
+            if (qrep != (mqd_t)-1) {
+                mq_send(qrep, (const char*)&rep, sizeof(rep), 0);
+                mq_close(qrep);
+            }
+        } else if (errno != ETIMEDOUT && errno != EAGAIN) {
+            perror("mq_timedreceive");
+        }
+
+        // Потребление мёда по расписанию
+        clock_gettime(CLOCK_MONOTONIC, &now);
+        now_ns = (long long)now.tv_sec*1000000000LL + now.tv_nsec;
+        if (now_ns >= next_eat_ns) {
+            if (remain > 0) {
+                int eat = portion;
+                if (eat > remain) eat = remain;
+                remain -= eat;
+                last_feed_ns = now_ns;
+                fprintf(stderr, "Winnie eats %d, remain=%d\n", eat, remain);
+            } else {
+                if (starvation_ms > 0 && (now_ns - last_feed_ns)/1000000LL >= starvation_ms) {
+                    fprintf(stderr, "Winnie starved, stopping\n");
+                    break;
+                }
+            }
+            next_eat_ns = now_ns + (long long)period_ms*1000000LL;
+        }
+
+        if (remain <= 0) {
+            msleep(100);
+            break;
+        }
+    }
+
+    mq_close(qreq);
+    mq_unlink(REQ_QUEUE);
+    fprintf(stderr, "Server: finished\n");
+    return 0;
+}