Mercurial > hg > nginx-quic

view src/os/win32/ngx_service.c @ 8759:56dec0d4e5b1 quic

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QUIC: avoid excessive buffer allocations in stream output. Previously, when a few bytes were send to a QUIC stream by the application, a 4K buffer was allocated for these bytes. Then a STREAM frame was created and that entire buffer was used as data for that frame. The frame with the buffer were in use up until the frame was acked by client. Meanwhile, when more bytes were send to the stream, more buffers were allocated and assigned as data to newer STREAM frames. In this scenario most buffer memory is unused. Now the unused part of the stream output buffer is available for further stream output while earlier parts of the buffer are waiting to be acked. This is achieved by splitting the output buffer.
author Roman Arutyunyan <arut@nginx.com>
date Fri, 24 Dec 2021 18:13:51 +0300
parents a1caf3989b49
children
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */



#define NGX_SERVICE_CONTROL_SHUTDOWN   128
#define NGX_SERVICE_CONTROL_REOPEN     129


SERVICE_TABLE_ENTRY st[] = {
    { "nginx", service_main },
    { NULL, NULL }
};


ngx_int_t
ngx_service(ngx_log_t *log)
{
    /* primary thread */

    /* StartServiceCtrlDispatcher() should be called within 30 seconds */

    if (StartServiceCtrlDispatcher(st) == 0) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                      "StartServiceCtrlDispatcher() failed");
        return NGX_ERROR;
    }

    return NGX_OK;
}


void
service_main(u_int argc, char **argv)
{
    SERVICE_STATUS         status;
    SERVICE_STATUS_HANDLE  service;

    /* thread spawned by SCM */

    service = RegisterServiceCtrlHandlerEx("nginx", service_handler, ctx);
    if (service == INVALID_HANDLE_VALUE) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                      "RegisterServiceCtrlHandlerEx() failed");
        return;
    }

    status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    status.dwCurrentState = SERVICE_START_PENDING;
    status.dwControlsAccepted = SERVICE_ACCEPT_STOP
                                |SERVICE_ACCEPT_PARAMCHANGE;
    status.dwWin32ExitCode = NO_ERROR;
    status.dwServiceSpecificExitCode = 0;
    status.dwCheckPoint = 1;
    status.dwWaitHint = 2000;

    /* SetServiceStatus() should be called within 80 seconds */

    if (SetServiceStatus(service, &status) == 0) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                      "SetServiceStatus() failed");
        return;
    }

    /* init */

    status.dwCurrentState = SERVICE_RUNNING;
    status.dwCheckPoint = 0;
    status.dwWaitHint = 0;

    if (SetServiceStatus(service, &status) == 0) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                      "SetServiceStatus() failed");
        return;
    }

    /* call master or worker loop */

    /*
     * master should use event notification and look status
     * single should use iocp to get notifications from service handler
     */

}


u_int
service_handler(u_int control, u_int type, void *data, void *ctx)
{
    /* primary thread */

    switch (control) {

    case SERVICE_CONTROL_INTERROGATE:
        status = NGX_IOCP_INTERROGATE;
        break;

    case SERVICE_CONTROL_STOP:
        status = NGX_IOCP_STOP;
        break;

    case SERVICE_CONTROL_PARAMCHANGE:
        status = NGX_IOCP_RECONFIGURE;
        break;

    case NGX_SERVICE_CONTROL_SHUTDOWN:
        status = NGX_IOCP_REOPEN;
        break;

    case NGX_SERVICE_CONTROL_REOPEN:
        status = NGX_IOCP_REOPEN;
        break;

    default:
        return ERROR_CALL_NOT_IMPLEMENTED;
    }

    if (ngx_single) {
        if (PostQueuedCompletionStatus(iocp, ... status, ...) == 0) {
            err = ngx_errno;
            ngx_log_error(NGX_LOG_ALERT, log, err,
                          "PostQueuedCompletionStatus() failed");
            return err;
        }

    } else {
        Event
    }

    return NO_ERROR;
}