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/* iemnet
* 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>
#define INBUFSIZE 65536L /* was 4096: size of receiving data buffer */
struct _iemnet_receiver {
pthread_t thread;
int sockfd; /* owned outside; you must call iemnet__receiver_destroy() before freeing socket yourself */
void*userdata;
t_iemnet_chunk*data;
t_iemnet_receivecallback callback;
t_iemnet_queue*queue;
int running;
t_clock *clock;
t_iemnet_floatlist*flist;
int keepreceiving;
int newdataflag;
pthread_mutex_t newdatamtx;
};
/* notifies Pd that there is new data to fetch */
static void iemnet_signalNewData(t_iemnet_receiver*x) {
int already=0;
pthread_mutex_lock(&x->newdatamtx);
already=x->newdataflag;
x->newdataflag=1;
/* don't schedule ticks at the end of life */
if(x->sockfd<0)already=1;
pthread_mutex_unlock(&x->newdatamtx);
if(already)return;
sys_lock();
if(x->clock)clock_delay(x->clock, 0);
sys_unlock();
}
/* the workhorse of the family */
static void*iemnet__receiver_readthread(void*arg) {
int result = 0;
t_iemnet_receiver*receiver=(t_iemnet_receiver*)arg;
int sockfd=receiver->sockfd;
t_iemnet_queue*q=receiver->queue;
unsigned char data[INBUFSIZE];
unsigned int size=INBUFSIZE;
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
unsigned int i=0;
for(i=0; i<size; i++)data[i]=0;
receiver->running=1;
while(1) {
t_iemnet_chunk*c=NULL;
fromlen = sizeof(from);
//fprintf(stderr, "reading %d bytes...\n", size);
//result = recv(sockfd, data, size, 0);
result = recvfrom(sockfd, data, size, 0, (struct sockaddr *)&from, &fromlen);
//fprintf(stderr, "read %d bytes...\n", result);
if(result<=0)break;
c= iemnet__chunk_create_dataaddr(result, data, &from);
queue_push(q, c);
iemnet_signalNewData(receiver);
}
if(result>=0)iemnet_signalNewData(receiver);
receiver->running=0;
//fprintf(stderr, "read thread terminated\n");
return NULL;
}
/* callback from Pd's main thread to fetch queued data */
static void iemnet__receiver_tick(t_iemnet_receiver *x)
{
// received data
t_iemnet_chunk*c=queue_pop_noblock(x->queue);
while(NULL!=c) {
x->flist = iemnet__chunk2list(c, x->flist);
(x->callback)(x->userdata, c, x->flist->argc, x->flist->argv);
iemnet__chunk_destroy(c);
c=queue_pop_noblock(x->queue);
}
pthread_mutex_lock(&x->newdatamtx);
x->newdataflag=0;
pthread_mutex_unlock(&x->newdatamtx);
if(!x->running) {
// read terminated
/* keepreceiving is set, if receiver is not yet in shutdown mode */
if(x->keepreceiving)
x->callback(x->userdata, NULL, 0, NULL);
}
}
int iemnet__receiver_getsize(t_iemnet_receiver*x) {
int size=-1;
if(x && x->queue)
size=queue_getsize(x->queue);
return size;
}
t_iemnet_receiver*iemnet__receiver_create(int sock, void*userdata, t_iemnet_receivecallback callback) {
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
t_iemnet_receiver*rec=(t_iemnet_receiver*)getbytes(sizeof(t_iemnet_receiver));
DEBUG("create new receiver for 0x%X:%d", userdata, sock);
//fprintf(stderr, "new receiver for %d\t%x\t%x\n", sock, userdata, callback);
if(rec) {
t_iemnet_chunk*data=iemnet__chunk_create_empty(INBUFSIZE);
int res=0;
if(NULL==data) {
iemnet__receiver_destroy(rec);
DEBUG("create receiver failed");
return NULL;
}
rec->keepreceiving=1;
rec->sockfd=sock;
rec->userdata=userdata;
rec->data=data;
rec->callback=callback;
rec->flist=iemnet__floatlist_create(1024);
memcpy(&rec->newdatamtx , &mtx, sizeof(pthread_mutex_t));
rec->newdataflag=0;
rec->queue = queue_create();
rec->clock = clock_new(rec, (t_method)iemnet__receiver_tick);
rec->running=1;
res=pthread_create(&rec->thread, 0, iemnet__receiver_readthread, rec);
}
//fprintf(stderr, "new receiver created\n");
return rec;
}
void iemnet__receiver_destroy(t_iemnet_receiver*rec) {
static int instance=0;
int inst=instance++;
int sockfd;
DEBUG("[%d] destroy receiver %x", inst, rec);
if(NULL==rec)return;
if(!rec->keepreceiving)return;
rec->keepreceiving=0;
sockfd=rec->sockfd;
rec->sockfd=-1;
DEBUG("[%d] really destroying receiver %x -> %d", inst, rec, sockfd);
if(sockfd>=0) {
shutdown(sockfd, 2); /* needed on linux, since the recv won't shutdown on sys_closesocket() alone */
sys_closesocket(sockfd);
}
DEBUG("[%d] closed socket %d", inst, sockfd);
pthread_join(rec->thread, NULL);
// empty the queue
DEBUG("[%d] tick %d", inst, rec->running);
iemnet__receiver_tick(rec);
DEBUG("[%d] tack", inst);
if(rec->data)iemnet__chunk_destroy(rec->data);
if(rec->flist)iemnet__floatlist_destroy(rec->flist);
pthread_mutex_destroy(&rec->newdatamtx);
clock_free(rec->clock);
rec->clock=NULL;
rec->userdata=NULL;
rec->data=NULL;
rec->callback=NULL;
rec->flist=NULL;
freebytes(rec, sizeof(t_iemnet_receiver));
rec=NULL;
DEBUG("[%d] destroyed receiver", inst);
}
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