Hi
I am very new to libevent and even to mailing lists (creating this
thread is probably the 20th try; I found no documentation on that; even
the help-command does not describe anything directly). Please be patient
if I don't describe my problem that well.
I post this question on stackoverflow before I knew this mailing list
but I think that the mailing list is the better option to get support
for libevent.
I am using libevent-2.1.3-alpha that I have compiled on my own because I
needed the pretty new function evbuffer_copyout_from (to get to this
point it took hours, but thats another story). Also I am using the
bufferevent for my programs.
While developing it's very common that things work or they don't (at
least for the present). My test program sends data to my server:
int main(int argc, char **argv)
{
// init stuff
// connect to server
sendPacket(bev);
return 0;
}
Running this program from terminal, it sends the data or not. So it does
not work every time but in most cases it does. I am guessing that
probably the kernel don't send the buffer it has stored. Anyways, there
have to be a method to work around this behavior, because I have to send
this package before I send another one given that the server responses
with a package that I have to proceed before.
My client have a GUI and it have to communicate with a server. Because
threads don't work as I want them to, I decided to use "event_base_loop"
so that it just blocks until one package is processed. After that it can
do GUI stuff so that the window won't freeze. And this simple could be
the while-loop of my program.
I am very certain that my sending fails and NOT my reading because my
server does not call the my callback for reading ("readcb").
I researched a lot about this, but I don't find anything. For example
bufferevent_flush(bev, EV_WRITE, BEV_FLUSH) don't works with sockets (i
tried it even out).
My current function for writing (in short form and simplified for one
package):
void sendPacket(bufferevent * bev)
{
// just data:
const unsigned int msg_ = 12;
char msg[msg_] = "01234567891";
// send that packet:
uint16_t packet_id = 1
bufferevent_write(bev, &packet_id, 2);
bufferevent_write(bev, msg, msg_);
//and this part SHOULD make that data really send but it does not
every time:
while (evbuffer_get_length(bufferevent_get_output(bev)) > 0)
{
event_base_loop(bufferevent_get_base(bev), EVLOOP_ONCE);
};
//this last one, only to be really sure (that's why i use the
second option):
event_base_loop(bufferevent_get_base(bev), EVLOOP_NONBLOCK |
EVLOOP_ONCE);
}
Thanks for your time, I would be lost without your help.
Regards, Andre
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