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#include <u.h>
#include <libc.h>
#include <venti.h>
enum {
IdealAlignment = 32,
ChunkSize = 128*1024
};
void
vtfree(void *p)
{
free(p);
}
void *
vtmalloc(ulong size)
{
void *p = mallocz(size, 0);
if(p == nil){
fprint(2, "vtmalloc: out of memory allocating %lud", size);
abort();
}
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtmallocz(ulong size)
{
void *p = mallocz(size, 1);
if(p == nil){
fprint(2, "vtmallocz: out of memory allocating %lud", size);
abort();
}
setmalloctag(p, getcallerpc(&size));
return p;
}
void *
vtrealloc(void *p, ulong size)
{
p = realloc(p, size);
if(p == 0 && size != 0){
fprint(2, "vtrealloc: out of memory allocating %lud", size);
abort();
}
setrealloctag(p, getcallerpc(&size));
return p;
}
void *
vtbrk(ulong n)
{
static Lock lk;
static uchar *buf;
static ulong nbuf, nchunk;
ulong align, pad;
void *p;
if(n >= IdealAlignment)
align = IdealAlignment;
else if(n > 8)
align = 8;
else
align = 4;
if(n > ChunkSize){
p = sbrk(n);
if(p == (void*)-1)
sysfatal("Failed to allocate permanent chunk size %lud", n);
memset(p, 0, n);
return (uchar*)p;
}
lock(&lk);
pad = (align - (uintptr)buf) & (align-1);
if(n + pad > nbuf) {
buf = sbrk(ChunkSize);
if(buf == (void*)-1)
sysfatal("Failed to allocate permanent chunk size %ud", ChunkSize);
memset(buf, 0, ChunkSize);
nbuf = ChunkSize;
pad = (align - (uintptr)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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