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/* iemnet
* data handling code
* - wrappers for data "chunks"
* - queues
*
* copyright (c) 2010 IOhannes m zmlnig, IEM
*/
#define DEBUGLEVEL 8
#include "iemnet.h"
#include "iemnet_data.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <pthread.h>
#define INBUFSIZE 65536L /* was 4096: size of receiving data buffer */
/* data handling */
t_iemnet_floatlist*iemnet__floatlist_init(t_iemnet_floatlist*cl) {
unsigned int i;
if(NULL==cl)return NULL;
for(i=0; i<cl->size; i++)
SETFLOAT((cl->argv+i), 0.f);
return cl;
}
void iemnet__floatlist_destroy(t_iemnet_floatlist*cl) {
if(NULL==cl)return;
if(cl->argv) free(cl->argv);
cl->argv=NULL;
cl->argc=0;
cl->size=0;
free(cl);
}
t_iemnet_floatlist*iemnet__floatlist_create(unsigned int size) {
t_iemnet_floatlist*result=(t_iemnet_floatlist*)malloc(sizeof(t_iemnet_floatlist));
if(NULL==result)return NULL;
result->argv = (t_atom*)malloc(size*sizeof(t_atom));
if(NULL==result->argv) {
iemnet__floatlist_destroy(result);
return NULL;
}
result->argc=size;
result->size=size;
result=iemnet__floatlist_init(result);
return result;
}
t_iemnet_floatlist*iemnet__floatlist_resize(t_iemnet_floatlist*cl, unsigned int size) {
t_atom*tmp;
if (NULL==cl) {
return iemnet__floatlist_create(size);
}
if(size<=cl->size) {
cl->argc=size;
return cl;
}
tmp=(t_atom*)malloc(size*sizeof(t_atom));
if(NULL==tmp) return NULL;
free(cl->argv);
cl->argv=tmp;
cl->argc=cl->size=size;
cl=iemnet__floatlist_init(cl);
return cl;
}
void iemnet__chunk_destroy(t_iemnet_chunk*c) {
if(NULL==c)return;
if(c->data)free(c->data);
c->data=NULL;
c->size=0;
free(c);
}
t_iemnet_chunk* iemnet__chunk_create_empty(int size) {
t_iemnet_chunk*result=(t_iemnet_chunk*)malloc(sizeof(t_iemnet_chunk));
if(result) {
result->size=size;
result->data=(unsigned char*)malloc(sizeof(unsigned char)*size);
if(NULL == result->data) {
result->size=0;
iemnet__chunk_destroy(result);
return NULL;
}
memset(result->data, 0, result->size);
result->addr=0L;
result->port=0;
}
return result;
}
t_iemnet_chunk* iemnet__chunk_create_data(int size, unsigned char*data) {
t_iemnet_chunk*result=iemnet__chunk_create_empty(size);
if(result) {
memcpy(result->data, data, result->size);
}
return result;
}
t_iemnet_chunk* iemnet__chunk_create_dataaddr(int size,
unsigned char*data,
struct sockaddr_in*addr) {
t_iemnet_chunk*result=iemnet__chunk_create_data(size, data);
if(addr) {
result->addr = ntohl(addr->sin_addr.s_addr);
result->port = ntohs(addr->sin_port);
}
return result;
}
t_iemnet_chunk* iemnet__chunk_create_list(int argc, t_atom*argv) {
int i;
t_iemnet_chunk*result=iemnet__chunk_create_empty(argc);
if(NULL==result)return NULL;
for(i=0; i<argc; i++) {
unsigned char c = atom_getint(argv);
result->data[i]=c;
argv++;
}
return result;
}
t_iemnet_chunk*iemnet__chunk_create_chunk(t_iemnet_chunk*c) {
t_iemnet_chunk*result=NULL;
if(NULL==c)return NULL;
result=iemnet__chunk_create_data(c->size, c->data);
result->addr=c->addr;
result->port=c->port;
return result;
}
t_iemnet_floatlist*iemnet__chunk2list(t_iemnet_chunk*c, t_iemnet_floatlist*dest) {
unsigned int i;
if(NULL==c)return NULL;
dest=iemnet__floatlist_resize(dest, c->size);
if(NULL==dest)return NULL;
for(i=0; i<c->size; i++) {
dest->argv[i].a_w.w_float = c->data[i];
}
return dest;
}
/* queue handling */
/*
* using code found at http://newsgroups.derkeiler.com/Archive/Comp/comp.programming.threads/2008-02/msg00502.html
*/
#ifdef t_iemnet_queue
# undef t_iemnet_queue
#endif
typedef struct _node {
struct _node* next;
t_iemnet_chunk*data;
} t_node;
struct _iemnet_queue {
t_node* head; /* = 0 */
t_node* tail; /* = 0 */
pthread_mutex_t mtx;
pthread_cond_t cond;
int done; // in cleanup state
int size;
};
/* push a chunk into the queue
* this will return the current queue size
*/
int queue_push(
t_iemnet_queue* const _this,
t_iemnet_chunk* const data
) {
t_node* tail;
t_node* n=NULL;
int size=-1;
if(NULL == _this)return size;
pthread_mutex_lock(&_this->mtx);
size=_this->size;
pthread_mutex_unlock(&_this->mtx);
if(NULL == data) return size;
n=(t_node*)malloc(sizeof(t_node));
n->next = 0;
n->data = data;
pthread_mutex_lock(&_this->mtx);
if (! (tail = _this->tail)) {
_this->head = n;
} else {
tail->next = n;
}
_this->tail = n;
_this->size+=data->size;
size=_this->size;
// added new chunk, so tell waiting threads that they can pop the data
pthread_cond_signal(&_this->cond);
pthread_mutex_unlock(&_this->mtx);
return size;
}
/* pop a chunk from the queue
* if the queue is empty, this will block until
* something has been pushed
* OR the queue is "done" (in which case NULL is returned)
*/
t_iemnet_chunk* queue_pop_block(
t_iemnet_queue* const _this
) {
t_node* head=0;
t_iemnet_chunk*data=0;
if(NULL == _this)return NULL;
pthread_mutex_lock(&_this->mtx);
/* if the queue is empty, wait */
if(NULL == _this->head) {
pthread_cond_wait(&_this->cond, &_this->mtx);
/* somebody signaled us, that we should do some work
* either the queue has been filled, or we are done...
*/
if(_this->done) {
pthread_mutex_unlock(&_this->mtx);
return NULL;
}
}
/* save the head, below we gonna work on this */
head = _this->head;
/* update _this */
if (! (_this->head = head->next)) {
_this->tail = 0;
}
if(head && head->data) {
_this->size-=head->data->size;
}
pthread_mutex_unlock(&_this->mtx);
if(head) {
data=head->data;
free(head);
head=NULL;
}
return data;
}
/* pop a chunk from the queue
* if the queue is empty, this will immediately return NULL
* (note that despite of the name this does block for synchronization)
*/
t_iemnet_chunk* queue_pop_noblock(
t_iemnet_queue* const _this
) {
t_node* head=0;
t_iemnet_chunk*data=0;
if(NULL == _this)return NULL;
pthread_mutex_lock(&_this->mtx);
if (! (head = _this->head)) {
// empty head
pthread_mutex_unlock(&_this->mtx);
return NULL;
}
if (! (_this->head = head->next)) {
_this->tail = 0;
}
if(head && head->data) {
_this->size-=head->data->size;
}
pthread_mutex_unlock(&_this->mtx);
if(head) {
data=head->data;
free(head);
head=NULL;
}
return data;
}
t_iemnet_chunk* queue_pop(t_iemnet_queue* const _this) {
return queue_pop_block(_this);
}
int queue_getsize(t_iemnet_queue* const _this) {
int size=-1;
if(_this) {
pthread_mutex_lock(&_this->mtx);
size=_this->size;
pthread_mutex_unlock(&_this->mtx);
}
return size;
}
void queue_finish(t_iemnet_queue* q) {
DEBUG("queue_finish: %x", q);
if(NULL==q) return;
pthread_mutex_lock(&q->mtx);
q->done=1;
DEBUG("queue signaling: %x", q);
pthread_cond_signal(&q->cond);
DEBUG("queue signaled: %x", q);
pthread_mutex_unlock(&q->mtx);
DEBUG("queue_finished: %x", q);
}
void queue_destroy(t_iemnet_queue* q) {
t_iemnet_chunk*c=NULL;
if(NULL==q)
return;
DEBUG("queue destroy %x", q);
queue_finish(q);
/* remove all the chunks from the queue */
while(NULL!=(c=queue_pop_noblock(q))) {
iemnet__chunk_destroy(c);
}
q->head=NULL;
q->tail=NULL;
pthread_mutex_destroy(&q->mtx);
pthread_cond_destroy(&q->cond);
free(q);
q=NULL;
DEBUG("queue destroyed %x", q);
}
t_iemnet_queue* queue_create(void) {
static pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
t_iemnet_queue*q=(t_iemnet_queue*)malloc(sizeof(t_iemnet_queue));
DEBUG("queue create %x", q);
if(NULL==q)return NULL;
q->head = NULL;
q->tail = NULL;
memcpy(&q->cond, &cond, sizeof(pthread_cond_t));
memcpy(&q->mtx , &mtx, sizeof(pthread_mutex_t));
q->done = 0;
q->size = 0;
DEBUG("queue created %x", q);
return q;
}
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