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#include "m_pd.h"
#include <stdio.h>
#include <sys/shm.h>
#include <sys/stat.h>
typedef struct shmem
{
t_object x_obj;
int segment_id;
t_float *share_memory;
int segment_size;
} t_shmem;
inline t_float min(t_float x1,t_float x2)
{
if (x1 <= x2) {
return x1;
} else {
return x2;
}
}
void shmem_set(t_shmem *x, t_symbol *unused, int argc, t_atom *argv)
{
t_garray *a;
int npoints;
int array_offset;
t_word *vec;
int i, index_max, shmem_offset;
if (argc <= 1) {
pd_error(x, "shmem usage : memset offset data (data can be a float, a list, or a table name)");
return;
}
if (argv[0].a_type != A_FLOAT) {
pd_error(x, "shmem usage : memset offset data (data can be a float, a list, or a table name)");
return;
}
shmem_offset = atom_getfloatarg(0,argc,argv);
if (shmem_offset < 0) shmem_offset=0;
if (argv[1].a_type == A_SYMBOL) { // argument is an arrayname
t_symbol *s = atom_getsymbolarg(1,argc,argv);
if (!(a = (t_garray *)pd_findbyclass(s, garray_class)))
pd_error(x, "%s: no such array", s->s_name);
else if (!garray_getfloatwords(a, &npoints, &vec))
pd_error(x, "%s: bad template for tabread", s->s_name);
else {
if (argc == 2) { // memset index_mem arrayname
index_max = min(x->segment_size-shmem_offset,npoints);
// post("i=%d", index_max);
for (i=0; i<index_max; i++)
x->share_memory[i+shmem_offset] = vec[i].w_float;
}
else if (argc == 3) { // memset index_mem arrayname array_offset
array_offset = atom_getfloatarg(2,argc,argv);
index_max = min(x->segment_size-shmem_offset,npoints-array_offset);
//post("i=%d", x->segment_size-shmem_offset);
//post("i=%d", npoints);
//post("i=%d", index_max);
for (i=0; i<index_max; i++)
x->share_memory[i+shmem_offset] = vec[i+array_offset].w_float;
}
}
}
else if (argv[1].a_type == A_FLOAT) { // argument is a float
index_max = x->segment_size - shmem_offset;
if (index_max > argc-1) index_max = argc-1;
for (i=0; i<index_max ; i++)
x->share_memory[i+shmem_offset]=atom_getfloatarg(i+1, argc, argv);
}
}
void shmem_dump(t_shmem *x, t_symbol *unused, int argc, t_atom *argv)
{
int i, vecsize, index_max, shmem_offset;
t_garray *a;
t_word *vec;
if (argc == 0) {
pd_error(x, "shmem usage : memdump offset dest (dest can be nothing (outlet), or a table name)");
return;
}
if (argv[0].a_type != A_FLOAT) {
pd_error(x, "shmem usage : memdump offset dest (dest can be nothing (outlet), or a table name)");
return;
}
shmem_offset = atom_getfloatarg(0,argc,argv);
if (shmem_offset < 0) shmem_offset = 0;
if (shmem_offset > x->segment_size-1) i = x->segment_size-1;
// post("i=%d", offset);
if (argc == 1)
outlet_float(x->x_obj.ob_outlet, x->share_memory[shmem_offset]);
else if (argv[1].a_type == A_SYMBOL) { // argument is an arrayname
t_symbol *s = atom_getsymbolarg(1,argc,argv);
if (!(a = (t_garray *)pd_findbyclass(s, garray_class)))
pd_error(x, "%s: no such array", s->s_name);
else {
if (!garray_getfloatwords(a, &vecsize, &vec))
pd_error(x, "%s: bad template for tabwrite", s->s_name);
else {
index_max = x->segment_size-shmem_offset;
if (index_max > vecsize)
index_max = vecsize;
// post("i=%d", index_max);
for (i=0; i<index_max; i++)
vec[i].w_float = x->share_memory[i+shmem_offset];
}
garray_redraw(a);
}
}
}
t_class *shmem_class;
void *shmem_new( t_floatarg id, t_floatarg size)
{
struct shmid_ds shmbuffer;
// post ("id, size: %f, %f", id, size);
t_shmem *x = (t_shmem *)pd_new(shmem_class);
x->segment_size = (int)size;
x->segment_id = shmget ((int)id, sizeof(t_float)*x->segment_size,
IPC_CREAT | S_IRUSR | S_IWUSR | S_IROTH | S_IWOTH);
if(x->segment_id>0) {
x->share_memory = (t_float*) shmat (x->segment_id, 0, 0);
// post("shmem memory attached at address %p\n", x->share_memory);
shmctl (x->segment_id, IPC_STAT, &shmbuffer);
// post ("segment size: %d\n", shmbuffer.shm_segsz);
if ((int)shmbuffer.shm_segsz < (int)sizeof(t_float)*x->segment_size) {
// there was a problem, set object meme size to 0
error("could not allocate shmem memory Id : %d, size %d", (int)id, x->segment_size );
x->segment_size = 0;
}
}
else {
error("could not allocate shmem memory Id : %d, size %d", (int)id, x->segment_size );
x->segment_size = 0;
}
outlet_new(&x->x_obj, 0);
return (void *)x;
}
void shmem_free(t_shmem *x)
{
shmdt (x->share_memory);
shmctl (x->segment_id, IPC_RMID, 0);
}
void shmem_clear(t_shmem *x)
{
int i;
for (i=0; i<x->segment_size; i++)
x->share_memory[i] = 0;
}
void shmem_setup(void)
{
shmem_class = class_new(gensym("shmem"), (t_newmethod)shmem_new, (t_method)shmem_free,
sizeof(t_shmem), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(shmem_class, (t_method)shmem_set, gensym("memset"), A_GIMME, 0);
class_addmethod(shmem_class, (t_method)shmem_dump, gensym("memdump"), A_GIMME, 0);
class_addmethod(shmem_class, (t_method)shmem_clear, gensym("memclear"), 0);
}
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