github.com/matrixorigin/matrixone@v1.2.0/pkg/common/mpool/alloc.go (about)

     1  // Copyright 2021 - 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build !race
    16  // +build !race
    17  
    18  package mpool
    19  
    20  import (
    21  	"unsafe"
    22  )
    23  
    24  func alloc(sz, requiredSpaceWithoutHeader int, mp *MPool) []byte {
    25  	bs := make([]byte, requiredSpaceWithoutHeader+kMemHdrSz)
    26  	hdr := unsafe.Pointer(&bs[0])
    27  	pHdr := (*memHdr)(hdr)
    28  	pHdr.poolId = mp.id
    29  	pHdr.fixedPoolIdx = NumFixedPool
    30  	pHdr.allocSz = int32(sz)
    31  	pHdr.SetGuard()
    32  	if mp.details != nil {
    33  		mp.details.recordAlloc(int64(pHdr.allocSz))
    34  	}
    35  	return pHdr.ToSlice(sz, requiredSpaceWithoutHeader)
    36  }