[4cedd9f] | 1 | // |
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[9f865d1] | 2 | // The contents of this file are covered under the licence agreement in the |
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| 3 | // file "LICENCE" distributed with Cforall. |
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[4cedd9f] | 4 | // |
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| 5 | // boundedBuffer.c -- |
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| 6 | // |
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[9f865d1] | 7 | // Author : Peter A. Buhr |
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| 8 | // Created On : Mon Oct 30 12:45:13 2017 |
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| 9 | // Last Modified By : Peter A. Buhr |
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[58caf150] | 10 | // Last Modified On : Fri Apr 20 22:18:18 2018 |
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| 11 | // Update Count : 78 |
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[4cedd9f] | 12 | // |
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[9f865d1] | 13 | |
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[58caf150] | 14 | #include <stdlib> // random |
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| 15 | #include <fstream> |
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[1033f5d] | 16 | #include <kernel> |
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| 17 | #include <thread> |
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[6c7b1e7] | 18 | #include <unistd.h> // getpid |
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[1033f5d] | 19 | |
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[58caf150] | 20 | //Duration default_preemption() { return 0; } |
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| 21 | |
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| 22 | enum { BufferSize = 50 }; |
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| 23 | |
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| 24 | forall( otype T ) |
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[1033f5d] | 25 | monitor Buffer { |
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[9f865d1] | 26 | condition full, empty; |
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| 27 | int front, back, count; |
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[58caf150] | 28 | T elements[BufferSize]; |
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[1033f5d] | 29 | }; |
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| 30 | |
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[58caf150] | 31 | forall( otype T ) |
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| 32 | void ?{}( Buffer(T) & buffer ) with( buffer ) { [front, back, count] = 0; } |
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[1033f5d] | 33 | |
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[58caf150] | 34 | forall( otype T ) |
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| 35 | int query( Buffer(T) & buffer ) { return buffer.count; } |
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[1033f5d] | 36 | |
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[58caf150] | 37 | forall( otype T ) |
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| 38 | void insert( Buffer(T) & mutex buffer, T elem ) with( buffer ) { |
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| 39 | if ( count == BufferSize ) wait( empty ); |
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[971d9f2] | 40 | elements[back] = elem; |
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[58caf150] | 41 | back = ( back + 1 ) % BufferSize; |
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[971d9f2] | 42 | count += 1; |
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| 43 | signal( full ); |
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[1033f5d] | 44 | } |
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[a1ecdd1] | 45 | |
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[58caf150] | 46 | forall( otype T ) |
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| 47 | T remove( Buffer(T) & mutex buffer ) with( buffer ) { |
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[971d9f2] | 48 | if ( count == 0 ) wait( full ); |
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[58caf150] | 49 | T elem = elements[front]; |
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| 50 | front = ( front + 1 ) % BufferSize; |
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[971d9f2] | 51 | count -= 1; |
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| 52 | signal( empty ); |
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[9f865d1] | 53 | return elem; |
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[1033f5d] | 54 | } |
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| 55 | |
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[58caf150] | 56 | const int Sentinel = -1; |
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| 57 | |
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[1033f5d] | 58 | thread Producer { |
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[58caf150] | 59 | Buffer(int) & buffer; |
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[9f865d1] | 60 | unsigned int N; |
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[1033f5d] | 61 | }; |
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[58caf150] | 62 | void main( Producer & prod ) with( prod ) { |
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| 63 | for ( int i = 1; i <= N; i += 1 ) { |
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[6c7b1e7] | 64 | yield( random( 5 ) ); |
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[58caf150] | 65 | insert( buffer, 1 ); |
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[9f865d1] | 66 | } // for |
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[1033f5d] | 67 | } |
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[58caf150] | 68 | void ?{}( Producer & prod, Buffer(int) * buffer, int N ) { |
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[9f865d1] | 69 | &prod.buffer = buffer; |
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| 70 | prod.N = N; |
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[a1ecdd1] | 71 | } |
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[1033f5d] | 72 | |
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| 73 | thread Consumer { |
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[58caf150] | 74 | Buffer(int) & buffer; |
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| 75 | int & sum; // summation of producer values |
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[1033f5d] | 76 | }; |
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[58caf150] | 77 | void main( Consumer & cons ) with( cons ) { |
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| 78 | sum = 0; |
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[9f865d1] | 79 | for ( ;; ) { |
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[6c7b1e7] | 80 | yield( random( 5 ) ); |
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[58caf150] | 81 | int item = remove( buffer ); |
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| 82 | if ( item == Sentinel ) break; // sentinel ? |
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| 83 | sum += item; |
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[9f865d1] | 84 | } // for |
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[1033f5d] | 85 | } |
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[58caf150] | 86 | void ?{}( Consumer & cons, Buffer(int) * buffer, int & sum ) { |
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[9f865d1] | 87 | &cons.buffer = buffer; |
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[58caf150] | 88 | &cons.sum = ∑ |
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[1033f5d] | 89 | } |
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| 90 | |
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| 91 | int main() { |
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[58caf150] | 92 | Buffer(int) buffer; |
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| 93 | enum { Prods = 4, Cons = 5 }; |
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[9f865d1] | 94 | Producer * prods[Prods]; |
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| 95 | Consumer * cons[Cons]; |
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| 96 | int sums[Cons]; |
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| 97 | int i; |
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| 98 | processor p; |
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[1033f5d] | 99 | |
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[54aba8d] | 100 | //srandom( getpid() ); |
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| 101 | srandom( 1003 ); |
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[1033f5d] | 102 | |
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[58caf150] | 103 | for ( i = 0; i < Cons; i += 1 ) { // create consumers |
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| 104 | cons[i] = new( &buffer, sums[i] ); |
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[9f865d1] | 105 | } // for |
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[58caf150] | 106 | for ( i = 0; i < Prods; i += 1 ) { // create producers |
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| 107 | prods[i] = new( &buffer, 100000 ); |
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[9f865d1] | 108 | } // for |
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[1033f5d] | 109 | |
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[58caf150] | 110 | for ( i = 0; i < Prods; i += 1 ) { // wait for producers to finish |
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[9f865d1] | 111 | delete( prods[i] ); |
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| 112 | } // for |
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[58caf150] | 113 | for ( i = 0; i < Cons; i += 1 ) { // generate sentinal values to stop consumers |
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[9f865d1] | 114 | insert( buffer, Sentinel ); |
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| 115 | } // for |
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| 116 | int sum = 0; |
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[58caf150] | 117 | for ( i = 0; i < Cons; i += 1 ) { // wait for consumers to finish |
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[9f865d1] | 118 | delete( cons[i] ); |
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| 119 | sum += sums[i]; |
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| 120 | } // for |
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| 121 | sout | "total:" | sum | endl; |
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[1033f5d] | 122 | } |
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[9f865d1] | 123 | |
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| 124 | // Local Variables: // |
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| 125 | // tab-width: 4 // |
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[58caf150] | 126 | // compile-command: "cfa boundedBufferINT.c" // |
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[9f865d1] | 127 | // End: // |
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