ElectronixTM
5cdf8871be
Lab 2 is in fact the first lab in the set of ones we actually do. It's not particularly hard, but consumed some time for me
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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* "THE CHEESE-WARE LICENSE" (Revision 1):
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* <ElectronixTM> wrote this file. As long as you retain this notice
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* you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me some cheese
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* in return
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*/
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#include <stdio.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <assert.h>
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volatile unsigned long long global = 0;
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#define NR_THREADS 4
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#define GLOBAL_STOP_VALUE 15
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pthread_t threads[NR_THREADS] = {0};
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void *thread_routine(void* args)
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{
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size_t arg = *((size_t *) args);
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// Так как на глобальном счетчике нет синхронизации,
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// количество выводов в консоль можен не совпадать с
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// GLOBAL_STOP_VALUE
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while (global < GLOBAL_STOP_VALUE) {
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printf("Hello from thread %lu\n", arg);
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global += 1;
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sleep(5);
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}
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pthread_exit(NULL);
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}
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int main()
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{
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for (size_t i = 0; i < NR_THREADS; i++) {
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size_t *arg = malloc(sizeof(*arg));
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assert(arg);
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*arg = i;
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pthread_create(&threads[i], NULL, thread_routine, arg);
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}
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int ret;
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for (size_t i = 0; i < NR_THREADS; i++) {
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ret = pthread_join(threads[i], NULL);
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if (ret) {
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break;
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}
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}
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return 0;
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}
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