NGINX module 多线程/线程池 代码示例

Queuing a task to thread from http request handler ( or location directive handler)

typedef struct {

    ngx_http_request_t  *pHttpRequest;

} ngx_thread_ctx;


    static ngx_int_t ngx_http_rdm_agent_handler(ngx_http_request_t *r)
    {
        ngx_thread_task_t    *task;
        ngx_thread_ctx *thread_ctx; // Thread context is my struct                                         
                                   // that has pointer to nginx_request_t struct
        ..........
        ..........  
        thread_ctx = (ngx_thread_ctx*)(task->ctx);
        thread_ctx->pHttpRequest = r;

        task->handler = my_thread_callback;
        task->event.handler = my_thread_completion;
        task->event.data = thread_ctx;

        //*** This is the key part. Increment this so nginx
        //*** won't finalize request (r)
        r->main->blocked++;

        // loc_cf -> location config struct where I added thread pool during 
        // configuration phase
        if (ngx_thread_task_post(loc_cf->pThreadPool, task) != NGX_OK) {
            r->main->blocked--;
            return NGX_ERROR;
        }

        return NGX_DONE;
    }

Completion handler of your thread

static void my_thread_completion(ngx_event_t *ev) 
{
    ngx_thread_ctx *ctx = (ngx_thread_ctx*)ev->data;    

    ctx->pHttpRequest->main->blocked--;

    ngx_http_finalize_request(ctx->pHttpRequest, NGX_DONE);
}