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frame_utils_test.go
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frame_utils_test.go
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// Copyright (c) 2015 Uber Technologies, Inc.
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package tchannel
import (
"fmt"
"sync"
"unsafe"
"github.com/prashantv/protectmem"
)
type protectMemAllocs struct {
frameAlloc *protectmem.Allocation
bufferAlloc *protectmem.Allocation
}
type ProtectMemFramePool struct {
sync.Mutex
allocations map[*Frame]protectMemAllocs
}
// NewProtectMemFramePool creates a frame pool that ensures that released frames
// are not reused by removing all access to a frame once it's been released.
func NewProtectMemFramePool() FramePool {
return &ProtectMemFramePool{
allocations: make(map[*Frame]protectMemAllocs),
}
}
func (p *ProtectMemFramePool) Get() *Frame {
frameAlloc := protectmem.Allocate(unsafe.Sizeof(Frame{}))
f := (*Frame)(frameAlloc.Ptr())
bufferAlloc := protectmem.AllocateSlice(&f.buffer, MaxFramePayloadSize)
f.buffer = f.buffer[:MaxFramePayloadSize]
f.Payload = f.buffer[FrameHeaderSize:]
f.headerBuffer = f.buffer[:FrameHeaderSize]
p.Lock()
p.allocations[f] = protectMemAllocs{
frameAlloc: frameAlloc,
bufferAlloc: bufferAlloc,
}
p.Unlock()
return f
}
func (p *ProtectMemFramePool) Release(f *Frame) {
p.Lock()
allocs, ok := p.allocations[f]
delete(p.allocations, f)
p.Unlock()
if !ok {
panic(fmt.Errorf("released frame that was not allocated by pool: %v", f.Header))
}
allocs.bufferAlloc.Protect(protectmem.None)
allocs.frameAlloc.Protect(protectmem.None)
}