func (block *Block) Release() {
if block.dirty {
n, err := block.cache.f.WriteAt(block.Buf[:], block.id<<blockShift)
bug.Err(err)
bug.Assert(n == blockSize)
}
}
func Start(path string) *Cache {
var cache Cache
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, perm)
bug.Err(err)
cache.f = f
cache.nextId = 1
return &cache
}
func fifoPing() {
var ball [1]byte
createFifo(pingFifo)
defer remove(pingFifo)
ping := openWrite(pingFifo)
pong := openRead(pongFifo)
ball[0] = 'b'
start := time.Now()
for i := 0; i < pingpong.Loops; i++ {
_, err := ping.Write(ball[:])
bug.Err(err)
//fmt.Println("Ping!")
_, err = pong.Read(ball[:])
bug.Err(err)
}
finish := time.Now()
fmt.Println("Total time: ",
float64(finish.UnixNano()-start.UnixNano())/float64(pingpong.Loops))
}
func tcpPong() {
var ball [1]byte
tcpAddr, err := net.ResolveTCPAddr("tcp4", pingpong.Service)
bug.Err(err)
pong, err := net.ListenTCP("tcp", tcpAddr)
bug.Err(err)
conn, err := pong.Accept()
bug.Err(err)
ball[0] = 'b'
for i := 0; i < pingpong.Loops; i++ {
_, err = conn.Read(ball[:])
bug.Err(err)
fmt.Println("Pong!")
_, err = conn.Write(ball[:])
bug.Err(err)
}
conn.Close()
}
func tcpPing() {
var ball [1]byte
tcpAddr, err := net.ResolveTCPAddr("tcp4", "taysom"+pingpong.Service)
bug.Err(err)
ping, err := net.DialTCP("tcp", nil, tcpAddr)
bug.Err(err)
ball[0] = 'b'
start := time.Now()
for i := 0; i < pingpong.Loops; i++ {
_, err := ping.Write(ball[:])
bug.Err(err)
fmt.Println("Ping!")
_, err = ping.Read(ball[:])
bug.Err(err)
}
finish := time.Now()
fmt.Println("Total time: ",
float64(finish.UnixNano()-start.UnixNano())/float64(pingpong.Loops))
}
func (cache *Cache) Get(blknum int64) *Block {
var block Block
n, err := cache.f.ReadAt(block.Buf[:], blknum<<blockShift)
if err == io.EOF {
n = blockSize
err = nil
}
bug.Err(err)
bug.Assert(n == blockSize)
block.id = blknum
block.cache = cache
return &block
}
func openWrite(name string) *os.File {
file, err := os.OpenFile(name, os.O_WRONLY, perm)
bug.Err(err)
return file
}
func openRead(name string) *os.File {
file, err := os.Open(name)
bug.Err(err)
return file
}
func remove(name string) {
err := os.Remove(name)
bug.Err(err)
}
func createFifo(name string) {
err := syscall.Mkfifo(name, perm)
bug.Err(err)
}