63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
// 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;
|
|
}
|
|
|