Ubuntu 下 nginx-1.24.0 源码分析 - ngx_cycle_modules-CSDN博客 

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定义在 src/core/ngx_module.c

ngx_int_t
ngx_cycle_modules(ngx_cycle_t *cycle)
{
    /*
     * create a list of modules to be used for this cycle,
     * copy static modules to it
     */

    cycle->modules = ngx_pcalloc(cycle->pool, (ngx_max_module + 1)
                                              * sizeof(ngx_module_t *));
    if (cycle->modules == NULL) {
        return NGX_ERROR;
    }

    ngx_memcpy(cycle->modules, ngx_modules,
               ngx_modules_n * sizeof(ngx_module_t *));

    cycle->modules_n = ngx_modules_n;

    return NGX_OK;
}

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    cycle->modules = ngx_pcalloc(cycle->pool, (ngx_max_module + 1)
                                              * sizeof(ngx_module_t *));
    if (cycle->modules == NULL) {
        return NGX_ERROR;
    }

在 cycle 的内存池中分配内存，存储模块指针数组

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ngx_max_module + 1：ngx_max_module 是最大模块数，+1 用于预留终止标记（ NULL）

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    ngx_memcpy(cycle->modules, ngx_modules,
               ngx_modules_n * sizeof(ngx_module_t *));

 将全局模块数组 ngx_modules 拷贝到 cycle->modules

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cycle->modules_n = ngx_modules_n;

将全局模块数量 ngx_modules_n 赋值给 cycle->modules_n

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return NGX_OK;

返回 NGX_OK，代表 成功