[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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[6c7b1e7] | 10 | // Last Modified On : Mon Oct 30 23:02:46 2017 |
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| 11 | // Update Count : 9 |
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[4cedd9f] | 12 | // |
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[9f865d1] | 13 | |
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[1033f5d] | 14 | #include <stdlib> |
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[6c7b1e7] | 15 | #include <fstream> // random |
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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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| 20 | monitor Buffer { |
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[9f865d1] | 21 | condition full, empty; |
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| 22 | int front, back, count; |
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| 23 | int elements[20]; |
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[1033f5d] | 24 | }; |
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| 25 | |
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| 26 | void ?{}( Buffer & buffer ) { |
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[9f865d1] | 27 | buffer.front = buffer.back = buffer.count = 0; |
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[1033f5d] | 28 | } |
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| 29 | |
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| 30 | int query( Buffer & buffer ) { return buffer.count; } |
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| 31 | |
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| 32 | void insert( Buffer & mutex buffer, int elem ) { |
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[4cedd9f] | 33 | if ( buffer.count == 20 ) wait( buffer.empty ); |
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[9f865d1] | 34 | buffer.elements[buffer.back] = elem; |
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| 35 | buffer.back = ( buffer.back + 1 ) % 20; |
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| 36 | buffer.count += 1; |
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[4cedd9f] | 37 | signal( buffer.full ); |
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[1033f5d] | 38 | } |
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| 39 | int remove( Buffer & mutex buffer ) { |
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[4cedd9f] | 40 | if ( buffer.count == 0 ) wait( buffer.full ); |
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[9f865d1] | 41 | int elem = buffer.elements[buffer.front]; |
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| 42 | buffer.front = ( buffer.front + 1 ) % 20; |
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| 43 | buffer.count -= 1; |
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[4cedd9f] | 44 | signal( buffer.empty ); |
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[9f865d1] | 45 | return elem; |
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[1033f5d] | 46 | } |
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| 47 | |
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| 48 | thread Producer { |
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[9f865d1] | 49 | Buffer & buffer; |
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| 50 | unsigned int N; |
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[1033f5d] | 51 | }; |
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| 52 | void main( Producer & prod ) { |
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[9f865d1] | 53 | for ( int i = 1; i <= prod.N; i += 1 ) { |
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[6c7b1e7] | 54 | yield( random( 5 ) ); |
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[9f865d1] | 55 | insert( prod.buffer, 1 ); |
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| 56 | } // for |
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| 57 | insert( prod.buffer, -1 ); |
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[1033f5d] | 58 | } |
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| 59 | void ?{}( Producer & prod, Buffer * buffer, unsigned int N ) { |
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[9f865d1] | 60 | &prod.buffer = buffer; |
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| 61 | prod.N = N; |
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| 62 | } |
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[1033f5d] | 63 | |
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| 64 | thread Consumer { |
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[9f865d1] | 65 | Buffer & buffer; |
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| 66 | int & sum; // summation of producer values |
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[1033f5d] | 67 | }; |
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| 68 | void main( Consumer & cons ) { |
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[9f865d1] | 69 | cons.sum = 0; |
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| 70 | for ( ;; ) { |
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[6c7b1e7] | 71 | yield( random( 5 ) ); |
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[9f865d1] | 72 | int item = remove( cons.buffer ); |
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| 73 | if ( item == -1 ) break; // sentinel ? |
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| 74 | cons.sum += item; |
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| 75 | } // for |
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[1033f5d] | 76 | } |
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| 77 | void ?{}( Consumer & cons, Buffer * buffer, int * sum ) { |
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[9f865d1] | 78 | &cons.buffer = buffer; |
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| 79 | &cons.sum = sum; |
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[1033f5d] | 80 | } |
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| 81 | |
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| 82 | int main() { |
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[9f865d1] | 83 | Buffer buffer; |
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| 84 | enum { Prods = 5, Cons = 5 }; |
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| 85 | Producer * prods[Prods]; |
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| 86 | Consumer * cons[Cons]; |
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| 87 | const int Sentinel = -1; |
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| 88 | int sums[Cons]; |
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| 89 | int i; |
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| 90 | processor p; |
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[1033f5d] | 91 | |
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[6c7b1e7] | 92 | //random_seed( getpid() ); |
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| 93 | random_seed( 1003 ); |
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[1033f5d] | 94 | |
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[9f865d1] | 95 | for ( i = 0; i < Cons; i += 1 ) { // create consumers |
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| 96 | cons[i] = new( &buffer, &sums[i] ); |
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| 97 | } // for |
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| 98 | for ( i = 0; i < Prods; i += 1 ) { // create producers |
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| 99 | prods[i] = new( &buffer, 100000u ); |
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| 100 | } // for |
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[1033f5d] | 101 | |
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[9f865d1] | 102 | for ( i = 0; i < Prods; i += 1 ) { // wait for producers to finish |
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| 103 | delete( prods[i] ); |
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| 104 | } // for |
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| 105 | for ( i = 0; i < Cons; i += 1 ) { // generate sentinal values to stop consumers |
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| 106 | insert( buffer, Sentinel ); |
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| 107 | } // for |
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| 108 | int sum = 0; |
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| 109 | for ( i = 0; i < Cons; i += 1 ) { // wait for consumers to finish |
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| 110 | delete( cons[i] ); |
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| 111 | sum += sums[i]; |
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| 112 | } // for |
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| 113 | sout | "total:" | sum | endl; |
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[1033f5d] | 114 | } |
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[9f865d1] | 115 | |
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| 116 | // Local Variables: // |
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| 117 | // tab-width: 4 // |
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| 118 | // compile-command: "cfa boundedBuffer.c" // |
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| 119 | // End: // |
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