diff options
Diffstat (limited to 'src/runtime/mfixalloc.go')
-rw-r--r-- | src/runtime/mfixalloc.go | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/runtime/mfixalloc.go b/src/runtime/mfixalloc.go new file mode 100644 index 000000000..b66a17e41 --- /dev/null +++ b/src/runtime/mfixalloc.go @@ -0,0 +1,59 @@ +// 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. + +package runtime + +import "unsafe" + +// Initialize f to allocate objects of the given size, +// using the allocator to obtain chunks of memory. +func fixAlloc_Init(f *fixalloc, size uintptr, first func(unsafe.Pointer, unsafe.Pointer), arg unsafe.Pointer, stat *uint64) { + f.size = size + f.first = *(*unsafe.Pointer)(unsafe.Pointer(&first)) + f.arg = arg + f.list = nil + f.chunk = nil + f.nchunk = 0 + f.inuse = 0 + f.stat = stat +} + +func fixAlloc_Alloc(f *fixalloc) unsafe.Pointer { + if f.size == 0 { + print("runtime: use of FixAlloc_Alloc before FixAlloc_Init\n") + gothrow("runtime: internal error") + } + + if f.list != nil { + v := unsafe.Pointer(f.list) + f.list = f.list.next + f.inuse += f.size + return v + } + if uintptr(f.nchunk) < f.size { + f.chunk = (*uint8)(persistentalloc(_FixAllocChunk, 0, f.stat)) + f.nchunk = _FixAllocChunk + } + + v := (unsafe.Pointer)(f.chunk) + if f.first != nil { + fn := *(*func(unsafe.Pointer, unsafe.Pointer))(unsafe.Pointer(&f.first)) + fn(f.arg, v) + } + f.chunk = (*byte)(add(unsafe.Pointer(f.chunk), f.size)) + f.nchunk -= uint32(f.size) + f.inuse += f.size + return v +} + +func fixAlloc_Free(f *fixalloc, p unsafe.Pointer) { + f.inuse -= f.size + v := (*mlink)(p) + v.next = f.list + f.list = v +} |