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