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