[e2f827f] | 1 | package main |
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| 2 | |
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| 3 | import ( |
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| 4 | "fmt" |
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| 5 | "sync" |
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| 6 | "time" |
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| 7 | "runtime" |
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| 8 | "os" |
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| 9 | "strconv" |
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| 10 | ) |
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| 11 | |
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| 12 | var Processors, Tasks, BarrierSize int = 1, 1, 2 |
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| 13 | var done bool = false; |
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| 14 | var total_operations uint64 = 0 |
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| 15 | var m sync.Mutex |
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| 16 | |
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| 17 | var taskJoin chan int = make(chan int, Tasks + 1) |
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| 18 | |
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| 19 | var barWait chan int = make(chan int, 2 * BarrierSize) |
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| 20 | var entryWait chan int = make(chan int, 2 * BarrierSize) |
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| 21 | |
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| 22 | func initBarrier() { |
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| 23 | for j := 0; j < BarrierSize; j++ { |
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| 24 | entryWait <- j |
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| 25 | } |
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| 26 | } |
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| 27 | |
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| 28 | func barrier() { |
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| 29 | ticket := <-entryWait |
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| 30 | if ( ticket == -1 ) { |
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| 31 | entryWait <- -1 |
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| 32 | return |
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| 33 | } |
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| 34 | if ( ticket == BarrierSize - 1 ) { |
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| 35 | for j := 0; j < BarrierSize - 1; j++ { |
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| 36 | barWait <- j |
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| 37 | } |
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| 38 | } else { |
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| 39 | ticket = <- barWait |
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| 40 | if ( ticket == -1 ) { |
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| 41 | barWait <- -1 |
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| 42 | return |
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| 43 | } |
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| 44 | } |
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| 45 | |
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| 46 | // last one out |
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| 47 | if ( BarrierSize == 1 || ticket == BarrierSize - 2 ) { |
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| 48 | for j := 0; j < BarrierSize; j++ { |
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| 49 | entryWait <- j |
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| 50 | } |
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| 51 | } |
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| 52 | } |
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| 53 | |
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| 54 | func task() { |
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| 55 | var count uint64 = 0 |
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| 56 | for { |
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| 57 | if done { break } |
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| 58 | barrier() |
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| 59 | count++ |
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| 60 | } |
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| 61 | m.Lock() |
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| 62 | total_operations += count |
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| 63 | // fmt.Print("C: ",count) |
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| 64 | m.Unlock() |
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| 65 | taskJoin <- 0 |
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| 66 | } |
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| 67 | |
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| 68 | func usage() { |
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| 69 | fmt.Printf( "Usage: %v " + |
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| 70 | "[ processors (> 0) | 'd' (default %v) ] " + |
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| 71 | "[ BarrierSize (> 0) | 'd' (default %v) ]\n", |
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| 72 | os.Args[0], Processors, BarrierSize ); |
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| 73 | os.Exit( 1 ); |
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| 74 | } |
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| 75 | |
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| 76 | func main() { |
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| 77 | switch len( os.Args ) { |
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| 78 | case 3: |
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| 79 | if os.Args[2] != "d" { // default ? |
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| 80 | BarrierSize, _ = strconv.Atoi( os.Args[2] ) |
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| 81 | if BarrierSize < 1 { usage(); } |
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| 82 | } // if |
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| 83 | fallthrough |
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| 84 | case 2: |
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| 85 | if os.Args[1] != "d" { // default ? |
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| 86 | Processors, _ = strconv.Atoi( os.Args[1] ) |
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| 87 | if Processors < 1 { usage(); } |
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| 88 | } // if |
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| 89 | case 1: // use defaults |
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| 90 | default: |
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| 91 | usage(); |
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| 92 | } // switch |
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| 93 | runtime.GOMAXPROCS( Processors ); |
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| 94 | Tasks = Processors |
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| 95 | |
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| 96 | if ( Tasks < BarrierSize ) { |
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| 97 | Tasks = BarrierSize |
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| 98 | } |
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| 99 | |
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| 100 | // fmt.Println("Processors: ",Processors," Channels: ",Channels," ProdsPerChan: ",ProdsPerChan," ConsPerChan: ",ConsPerChan," Channel Size: ",ChannelSize) |
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| 101 | taskJoin = make(chan int, Tasks + 1) |
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| 102 | barWait = make(chan int, 2 * BarrierSize) |
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| 103 | entryWait = make(chan int, 2 * BarrierSize) |
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| 104 | initBarrier() |
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| 105 | |
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| 106 | for j := 0; j < Tasks; j++ { |
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| 107 | go task() |
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| 108 | } |
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| 109 | |
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| 110 | // wait 10 seconds |
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| 111 | time.Sleep(time.Second * 10) |
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| 112 | // fmt.Println("prod done\n") |
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| 113 | done = true |
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| 114 | |
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| 115 | for j := 0; j < BarrierSize; j++ { |
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| 116 | barWait <- -1 |
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| 117 | entryWait <- -1 |
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| 118 | } |
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| 119 | |
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| 120 | for j := 0; j < Tasks; j++ { |
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| 121 | <-taskJoin |
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| 122 | } |
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| 123 | |
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| 124 | fmt.Println(total_operations) |
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| 125 | } |
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