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/* iemnet
*
* sender
* sends data "chunks" to a socket
* possibly threaded
*
* copyright (c) 2010 IOhannes m zmölnig, IEM
*/
//#define DEBUG
#include "iemnet.h"
#include "iemnet_data.h"
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#ifdef _WIN32
# include <winsock2.h>
# include <ws2tcpip.h> /* for socklen_t */
#else
# include <sys/socket.h>
#endif
#include <pthread.h>
/* draft:
* - there is a sender thread for each open connection
* - the main thread just adds chunks to each sender threads processing queue
* - the sender thread tries to send the queue as fast as possible
*/
struct _iemnet_sender {
pthread_t thread;
int sockfd; /* owned outside; must call iemnet__sender_destroy() before freeing socket yourself */
t_iemnet_queue*queue;
int keepsending; // indicates whether we want to thread to continue or to terminate
int isrunning;
};
/* the workhorse of the family */
static int iemnet__sender_dosend(int sockfd, t_iemnet_queue*q) {
t_iemnet_chunk*c=queue_pop_block(q);
if(c) {
unsigned char*data=c->data;
unsigned int size=c->size;
int result=-1;
// fprintf(stderr, "sending %d bytes at %x to %d\n", size, data, sockfd);
DEBUG("sending %d bytes", size);
result = send(sockfd, data, size, 0);
if(result<0) {
// broken pipe
return 0;
}
// shouldn't we do something with the result here?
DEBUG("sent %d bytes", result);
iemnet__chunk_destroy(c);
} else {
return 0;
}
return 1;
}
static void*iemnet__sender_sendthread(void*arg) {
t_iemnet_sender*sender=(t_iemnet_sender*)arg;
int sockfd=sender->sockfd;
t_iemnet_queue*q=sender->queue;
while(sender->keepsending) {
if(!iemnet__sender_dosend(sockfd, q))break;
}
sender->isrunning=0;
DEBUG("send thread terminated");
return NULL;
}
int iemnet__sender_send(t_iemnet_sender*s, t_iemnet_chunk*c) {
t_iemnet_queue*q=s->queue;
int size=-1;
if(!s->isrunning)return -1;
if(q) {
t_iemnet_chunk*chunk=iemnet__chunk_create_chunk(c);
size = queue_push(q, chunk);
}
return size;
}
void iemnet__sender_destroy(t_iemnet_sender*s) {
/* simple protection against recursive calls:
* s->keepsending is only set to "0" in here,
* so if it is false, we know that we are already being called
*/
if(!s->keepsending)return;
DEBUG("destroy sender %x", s);
s->keepsending=0;
queue_finish(s->queue);
DEBUG("queue finished");
s->sockfd = -1;
pthread_join(s->thread, NULL);
DEBUG("thread joined");
queue_destroy(s->queue);
freebytes(s, sizeof(t_iemnet_sender));
s=NULL;
DEBUG("destroyed sender");
}
t_iemnet_sender*iemnet__sender_create(int sock) {
t_iemnet_sender*result=(t_iemnet_sender*)getbytes(sizeof(t_iemnet_sender));
int res=0;
DEBUG("create sender %x", result);
if(NULL==result){
DEBUG("create sender failed");
return NULL;
}
result->queue = queue_create();
result->sockfd = sock;
result->keepsending =1;
result->isrunning=1;
res=pthread_create(&result->thread, 0, iemnet__sender_sendthread, result);
if(0==res) {
} else {
// something went wrong
}
DEBUG("created sender");
return result;
}
int iemnet__sender_getlasterror(t_iemnet_sender*x) {
x=NULL;
#ifdef _WIN32
return WSAGetLastError();
#endif
return errno;
}
int iemnet__sender_getsockopt(t_iemnet_sender*s, int level, int optname, void *optval, socklen_t*optlen) {
int result=getsockopt(s->sockfd, level, optname, optval, optlen);
if(result!=0) {
post("%s: getsockopt returned %d", __FUNCTION__, iemnet__sender_getlasterror(s));
}
return result;
}
int iemnet__sender_setsockopt(t_iemnet_sender*s, int level, int optname, const void*optval, socklen_t optlen) {
int result=setsockopt(s->sockfd, level, optname, optval, optlen);
if(result!=0) {
post("%s: setsockopt returned %d", __FUNCTION__, iemnet__sender_getlasterror(s));
}
return result;
}
int iemnet__sender_getsize(t_iemnet_sender*x) {
int size=-1;
if(x && x->queue)
size=queue_getsize(x->queue);
return size;
}
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