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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fixed-size object allocator. Returned memory is not zeroed.
//
// See malloc.h for overview.
#include "runtime.h"
#include "malloc.h"
// Initialize f to allocate objects of the given size,
// using the allocator to obtain chunks of memory.
void
runtime_FixAlloc_Init(FixAlloc *f, uintptr size, void *(*alloc)(uintptr), void (*first)(void*, byte*), void *arg)
{
f->size = size;
f->alloc = alloc;
f->first = first;
f->arg = arg;
f->list = nil;
f->chunk = nil;
f->nchunk = 0;
f->inuse = 0;
f->sys = 0;
}
void*
runtime_FixAlloc_Alloc(FixAlloc *f)
{
void *v;
if(f->list) {
v = f->list;
f->list = *(void**)f->list;
f->inuse += f->size;
return v;
}
if(f->nchunk < f->size) {
f->sys += FixAllocChunk;
f->chunk = f->alloc(FixAllocChunk);
if(f->chunk == nil)
runtime_throw("out of memory (FixAlloc)");
f->nchunk = FixAllocChunk;
}
v = f->chunk;
if(f->first)
f->first(f->arg, v);
f->chunk += f->size;
f->nchunk -= f->size;
f->inuse += f->size;
return v;
}
void
runtime_FixAlloc_Free(FixAlloc *f, void *p)
{
f->inuse -= f->size;
*(void**)p = f->list;
f->list = p;
}
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