Question

我正在使用Glib来开发多线程C软件。

我想拥有一组活着的线程。一旦某个线程完成，另一个线程以不同的参数开始。它就像一个线程池。

我正在使用glib thread来实现多线程。但我找不到Google的很多教程。我现在可以启动一组线程，但不知道等待。我的一些代码：

GThread *threads[n_threads];
thread_aux_t *data = (thread_aux_t*) calloc(n_threads, sizeof(thread_aux_t));
for (i = 0; i < n_threads; ++i) {
    data[i].parameter = i;
    threads[i] = g_thread_create((GThreadFunc) pe_lib_thread, data + i,
            TRUE, NULL);
}

/* wait for threads to finish */
for (i = 0; i < n_threads; ++i) {
    g_thread_join(threads[i]); // How to start a new thread depending on the return value?
}
free(data);

感谢。

问题解决了。更新：

刚刚找到了glib的线程池实现：Thread Pools。我已经运行它并且它正常工作。代码写为：

// 'query' is for this new thread, 
// 'data' is the global parameters set when initiating the pool
void *pe_lib_thread(gpointer query, gpointer data) {
}

void run_threads() {
    GThreadPool *thread_pool = NULL;
    // Global parameters by all threads.
    thread_aux_t *data = (thread_aux_t*) calloc(1, sizeof(thread_aux_t));

    data->shared_hash_table = get_hash_table();
    g_thread_init(NULL);
    thread_pool = g_thread_pool_new((GFunc) pe_lib_thread, data, n_threads,
            TRUE, NULL);
    // If n_threads is 10, there are maximum 10 threads running, others are waiting.
    for (i = 0; i < n_queries; i++) {
        query = &queries[i];
        g_thread_pool_push(thread_pool, (gpointer) query, NULL);
    }
    g_thread_pool_free(thread_pool, 0, 1);
}

Answer 1

g_thread_join返回返回值，因此您只需检查它。假设您希望在返回值为17时创建新进程。

for (i = 0; i < n_threads; ++i) {
    if (threads[i] && g_thread_join(threads[i]) == 17) {  
        /* Start a new thread. */
        threads[i] = g_thread_create((GThreadFunc) pe_lib_thread, data + i,
            TRUE, NULL);
    } else {
        threads[i] = NULL;
    }
}

Glib：如何在另一个线程完成之前启动一个新线程？

1 个答案: