nginx的event模块初始化源码分析

下面我们看一下各个模块create_conf函数的代码。
这是ngx_event_core_module模块的create_conf函数。

// 创建存储事件模块配置的结构体
static void *ngx_event_create_conf(ngx_cycle_t *cycle)
{
    ngx_event_conf_t  *ecf;

    ngx_test_null(ecf, ngx_palloc(cycle->pool, sizeof(ngx_event_conf_t)),
                  NGX_CONF_ERROR);

    ecf->connections = NGX_CONF_UNSET_UINT;
    ecf->use = NGX_CONF_UNSET_UINT;
    ecf->multi_accept = NGX_CONF_UNSET;
    ecf->accept_mutex = NGX_CONF_UNSET;
    ecf->accept_mutex_delay = NGX_CONF_UNSET_MSEC;
    ecf->name = (void *) NGX_CONF_UNSET;

#if (NGX_DEBUG)
    ngx_init_array(ecf->debug_connection, cycle->pool, 5, sizeof(in_addr_t),
                   NGX_CONF_ERROR);
#endif

    return ecf;
}

剩下的几个event子模块都是事件驱动相关的，epoll的create_conf函数如下。

static void *ngx_epoll_create_conf(ngx_cycle_t *cycle)
{
    ngx_epoll_conf_t  *epcf;

    ngx_test_null(epcf, ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t)),
                  NGX_CONF_ERROR);

    epcf->events = NGX_CONF_UNSET;

    return epcf;
}

kqueue的如下。

static void *ngx_kqueue_create_conf(ngx_cycle_t *cycle)
{
    ngx_kqueue_conf_t  *kcf;

    ngx_test_null(kcf, ngx_palloc(cycle->pool, sizeof(ngx_kqueue_conf_t)),
                  NGX_CONF_ERROR);

    kcf->changes = NGX_CONF_UNSET;
    kcf->events = NGX_CONF_UNSET;

    return kcf;
}

有些子模块没有实现create_conf函数，所有模块的create_conf函数执行完后。