HTTP/3: generate more H3_FRAME_UNEXPECTED. As per quic-http-34, these are the cases when this error should be generated: If an endpoint receives a second SETTINGS frame on the control stream, the endpoint MUST respond with a connection error of type H3_FRAME_UNEXPECTED SETTINGS frames MUST NOT be sent on any stream other than the control stream. If an endpoint receives a SETTINGS frame on a different stream, the endpoint MUST respond with a connection error of type H3_FRAME_UNEXPECTED. A client MUST NOT send a PUSH_PROMISE frame. A server MUST treat the receipt of a PUSH_PROMISE frame as a connection error of type H3_FRAME_UNEXPECTED; see Section 8. The MAX_PUSH_ID frame is always sent on the control stream. Receipt of a MAX_PUSH_ID frame on any other stream MUST be treated as a connection error of type H3_FRAME_UNEXPECTED. Receipt of an invalid sequence of frames MUST be treated as a connection error of type H3_FRAME_UNEXPECTED; see Section 8. In particular, a DATA frame before any HEADERS frame, or a HEADERS or DATA frame after the trailing HEADERS frame, is considered invalid. A CANCEL_PUSH frame is sent on the control stream. Receiving a CANCEL_PUSH frame on a stream other than the control stream MUST be treated as a connection error of type H3_FRAME_UNEXPECTED. The GOAWAY frame is always sent on the control stream.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


ngx_int_t
ngx_thread_cond_create(ngx_thread_cond_t *cond, ngx_log_t *log)
{
    ngx_err_t  err;

    err = pthread_cond_init(cond, NULL);
    if (err == 0) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_EMERG, log, err, "pthread_cond_init() failed");
    return NGX_ERROR;
}


ngx_int_t
ngx_thread_cond_destroy(ngx_thread_cond_t *cond, ngx_log_t *log)
{
    ngx_err_t  err;

    err = pthread_cond_destroy(cond);
    if (err == 0) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_EMERG, log, err, "pthread_cond_destroy() failed");
    return NGX_ERROR;
}


ngx_int_t
ngx_thread_cond_signal(ngx_thread_cond_t *cond, ngx_log_t *log)
{
    ngx_err_t  err;

    err = pthread_cond_signal(cond);
    if (err == 0) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_EMERG, log, err, "pthread_cond_signal() failed");
    return NGX_ERROR;
}


ngx_int_t
ngx_thread_cond_wait(ngx_thread_cond_t *cond, ngx_thread_mutex_t *mtx,
    ngx_log_t *log)
{
    ngx_err_t  err;

    err = pthread_cond_wait(cond, mtx);

#if 0
    ngx_time_update();
#endif

    if (err == 0) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_cond_wait() failed");

    return NGX_ERROR;
}