[382467f] | 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, Channels, Prods, Cons, ChannelSize int = 2, 2, 1, 1, 10 |
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| 13 | var cons_done, prod_done bool = false, false; |
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| 14 | var total_operations, cons_check, prod_check uint64 = 0, 0, 0 |
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| 15 | var m sync.Mutex |
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| 16 | |
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| 17 | var prodJoin chan int = make(chan int, Prods) |
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| 18 | var consJoin chan int = make(chan int, Cons) |
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| 19 | |
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| 20 | func consumer( chans [] chan uint64 ) { |
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| 21 | var count uint64 = 0 |
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| 22 | for { |
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| 23 | if cons_done { break } |
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| 24 | |
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| 25 | select { |
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| 26 | case <- chans[0]: |
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| 27 | case <- chans[1]: |
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| 28 | } |
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| 29 | if ! prod_done { count++ } |
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| 30 | } |
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| 31 | m.Lock() |
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| 32 | total_operations += count |
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| 33 | m.Unlock() |
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| 34 | consJoin <- 0 |
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| 35 | } |
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| 36 | |
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| 37 | func producer( chans [] chan uint64 ) { |
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| 38 | var count uint64 = 0 |
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| 39 | for { |
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| 40 | if prod_done { break } |
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| 41 | select { |
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| 42 | case chans[0] <- count: |
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| 43 | case chans[1] <- count: |
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| 44 | } |
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| 45 | count++ |
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| 46 | } |
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| 47 | prodJoin <- 0 |
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| 48 | } |
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| 49 | |
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| 50 | func usage() { |
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| 51 | fmt.Printf( "Usage: %v " + |
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| 52 | "[ processors (> 0) | 'd' (default %v) ] " + |
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| 53 | "[ ChannelSize (> 0) | 'd' (default %v) ]\n", |
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| 54 | os.Args[0], Processors, ChannelSize ); |
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| 55 | os.Exit( 1 ); |
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| 56 | } |
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| 57 | |
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| 58 | func main() { |
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| 59 | switch len( os.Args ) { |
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| 60 | case 3: |
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| 61 | if os.Args[2] != "d" { // default ? |
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| 62 | ChannelSize, _ = strconv.Atoi( os.Args[2] ) |
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| 63 | if ChannelSize < 0 { usage(); } |
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| 64 | } // if |
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| 65 | fallthrough |
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| 66 | case 2: |
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| 67 | if os.Args[1] != "d" { // default ? |
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| 68 | Processors, _ = strconv.Atoi( os.Args[1] ) |
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| 69 | if Processors < 1 { usage(); } |
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| 70 | } // if |
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| 71 | case 1: // use defaults |
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| 72 | default: |
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| 73 | usage(); |
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| 74 | } // switch |
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| 75 | runtime.GOMAXPROCS( Processors ); |
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| 76 | Prods = Processors /2 |
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| 77 | Cons = Processors / 2 |
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| 78 | |
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| 79 | // fmt.Println("Processors: ",Processors," Channels: ",Channels," ProdsPerChan: ",ProdsPerChan," ConsPerChan: ",ConsPerChan," Channel Size: ",ChannelSize) |
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| 80 | |
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| 81 | chans := make( [] chan uint64, Channels ) |
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| 82 | for i := range chans { |
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| 83 | chans[i] = make(chan uint64, ChannelSize) |
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| 84 | } |
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| 85 | for j := 0; j < Prods; j++ { |
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| 86 | go producer( chans ) |
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| 87 | } |
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| 88 | |
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| 89 | for j := 0; j < Cons; j++ { |
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| 90 | go consumer( chans ) |
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| 91 | } |
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| 92 | |
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| 93 | // wait 10 seconds |
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| 94 | time.Sleep(time.Second * 10) |
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| 95 | // fmt.Println("prod done\n") |
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| 96 | prod_done = true |
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| 97 | for j := 0; j < Prods; j++ { |
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| 98 | <-prodJoin |
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| 99 | } |
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| 100 | // fmt.Println("cons done\n") |
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| 101 | cons_done = true |
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| 102 | for i := range chans { |
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| 103 | close(chans[i]) |
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| 104 | } |
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| 105 | |
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| 106 | for j := 0; j < Cons; j++{ |
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| 107 | <-consJoin |
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| 108 | } |
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| 109 | |
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| 110 | fmt.Println(total_operations) |
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| 111 | } |
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