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#include <u.h>
#include <libc.h>
#include <venti.h>
enum {
IdealAlignment = 32,
ChunkSize = 128*1024
};
void
vtfree(void *p)
{
if(p == 0)
return;
free(p);
}
void *
vtmalloc(int size)
{
void *p;
p = malloc(size);
if(p == 0)
sysfatal("vtmalloc: out of memory");
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtmallocz(int size)
{
void *p = vtmalloc(size);
memset(p, 0, size);
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtrealloc(void *p, int size)
{
if(p == nil)
return vtmalloc(size);
p = realloc(p, size);
if(p == 0)
sysfatal("vtMemRealloc: out of memory");
setrealloctag(p, getcallerpc(&size));
return p;
}
void *
vtbrk(int n)
{
static Lock lk;
static uchar *buf;
static int nbuf;
static int nchunk;
int align, pad;
void *p;
if(n >= IdealAlignment)
align = IdealAlignment;
else if(n > 8)
align = 8;
else
align = 4;
lock(&lk);
pad = (align - (ulong)buf) & (align-1);
if(n + pad > nbuf) {
buf = vtmallocz(ChunkSize);
nbuf = ChunkSize;
pad = (align - (ulong)buf) & (align-1);
nchunk++;
}
assert(n + pad <= nbuf);
p = buf + pad;
buf += pad + n;
nbuf -= pad + n;
unlock(&lk);
return p;
}
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