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        push    eax

        push    eax

        lea     ecx, [eax + SOCKET.mutex]

        lea     ecx, [eax + SOCKET.mutex]

        call    mutex_lock

        call    mutex_lock

        pop     eax

        pop     eax

; We'll detect the length of the data to be transmitted, and flags to be used

; We'll detect the length of the data to be transmitted, and flags to be used

; If there is some data, or any critical controls to send (SYN / RST), then transmit

; If there is some data, or any critical controls to send (SYN / RST), then transmit

; Otherwise, investigate further

; Otherwise, investigate further

        push    ecx

        push    ecx

        mov     cl, [eax + TCP_SOCKET.RCV_SCALE]

        mov     cl, [eax + TCP_SOCKET.RCV_SCALE]

        mov     ebx, TCP_max_win

        mov     ebx, TCP_max_win

        shl     ebx, cl

        shl     ebx, cl

        pop     ecx

        pop     ecx

        cmp     ebx, ecx

        cmp     ebx, ecx

        jb      @f

        jb      @f

        mov     ebx, ecx

        mov     ebx, ecx

       @@:

       @@:

        sub     ebx, [eax + TCP_SOCKET.RCV_ADV]

        sub     ebx, [eax + TCP_SOCKET.RCV_ADV]

        and     [eax + TCP_SOCKET.t_flags], not (TF_ACKNOW + TF_DELACK)

        and     [eax + TCP_SOCKET.t_flags], not (TF_ACKNOW + TF_DELACK)

;--------------

;--------------

; unlock socket

        DEBUGF  DEBUG_NETWORK_VERBOSE, "TCP_send: unlocking socket 0x%x\n", eax

        push    eax

        push    eax

        lea     ecx, [eax + SOCKET.mutex]

        lea     ecx, [eax + SOCKET.mutex]

        or      eax, -1

        or      eax, -1

        ret

        ret

  .send_error:

        add     esp, 4

        add     esp, 8

        pop     eax