1 | // |
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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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4 | // |
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5 | // boundedBufferEXT.c -- |
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6 | // |
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7 | // Author : Peter A. Buhr |
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8 | // Created On : Wed Apr 18 22:52:12 2018 |
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9 | // Last Modified By : Peter A. Buhr |
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10 | // Last Modified On : Wed May 2 16:12:58 2018 |
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11 | // Update Count : 7 |
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12 | // |
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13 | |
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14 | #include <stdlib.hfa> // random |
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15 | #include <fstream.hfa> |
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16 | #include <kernel.hfa> |
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17 | #include <thread.hfa> |
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18 | #include <unistd.h> // getpid |
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19 | |
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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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25 | monitor Buffer { |
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26 | int front, back, count; |
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27 | T elements[BufferSize]; |
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28 | }; // Buffer |
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29 | |
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30 | void ?{}( Buffer(T) & buffer ) with( buffer ) { [front, back, count] = 0; } |
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31 | |
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32 | int query( Buffer(T) & buffer ) { return buffer.count; } // read-only, no mutual exclusion |
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33 | |
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34 | T remove( Buffer(T) & mutex buffer ); // forward |
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35 | |
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36 | void insert( Buffer(T) & mutex buffer, T elem ) with( buffer ) { |
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37 | if ( count == BufferSize ) waitfor( remove, buffer ); |
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38 | elements[back] = elem; |
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39 | back = ( back + 1 ) % BufferSize; |
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40 | count += 1; |
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41 | } // insert |
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42 | |
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43 | T remove( Buffer(T) & mutex buffer ) with( buffer ) { |
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44 | if ( count == 0 ) waitfor( insert, buffer ); |
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45 | T elem = elements[front]; |
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46 | front = ( front + 1 ) % BufferSize; |
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47 | count -= 1; |
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48 | return elem; |
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49 | } // remove |
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50 | } |
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51 | |
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52 | const int Sentinel = -1; |
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53 | |
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54 | thread Producer { |
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55 | Buffer(int) & buffer; |
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56 | unsigned int N; |
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57 | }; |
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58 | void main( Producer & prod ) with( prod ) { |
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59 | for ( int i = 1; i <= N; i += 1 ) { |
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60 | yield( random( 5 ) ); |
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61 | insert( buffer, 1 ); |
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62 | } // for |
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63 | } |
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64 | void ?{}( Producer & prod, Buffer(int) * buffer, int N ) { |
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65 | &prod.buffer = buffer; |
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66 | prod.N = N; |
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67 | } |
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68 | |
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69 | thread Consumer { |
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70 | Buffer(int) & buffer; |
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71 | int & sum; // summation of producer values |
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72 | }; |
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73 | void main( Consumer & cons ) with( cons ) { |
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74 | sum = 0; |
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75 | for ( ;; ) { |
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76 | yield( random( 5 ) ); |
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77 | int item = remove( buffer ); |
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78 | if ( item == Sentinel ) break; // sentinel ? |
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79 | sum += item; |
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80 | } // for |
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81 | } |
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82 | void ?{}( Consumer & cons, Buffer(int) * buffer, int & sum ) { |
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83 | &cons.buffer = buffer; |
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84 | &cons.sum = ∑ |
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85 | } |
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86 | |
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87 | int main() { |
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88 | Buffer(int) buffer; |
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89 | enum { Prods = 4, Cons = 5 }; |
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90 | Producer * prods[Prods]; |
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91 | Consumer * cons[Cons]; |
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92 | int sums[Cons]; |
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93 | int i; |
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94 | processor p; |
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95 | |
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96 | //srandom( getpid() ); |
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97 | srandom( 1003 ); |
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98 | |
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99 | for ( i = 0; i < Cons; i += 1 ) { // create consumers |
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100 | cons[i] = new( &buffer, sums[i] ); |
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101 | } // for |
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102 | for ( i = 0; i < Prods; i += 1 ) { // create producers |
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103 | prods[i] = new( &buffer, 100000 ); |
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104 | } // for |
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105 | |
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106 | for ( i = 0; i < Prods; i += 1 ) { // wait for producers to finish |
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107 | delete( prods[i] ); |
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108 | } // for |
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109 | for ( i = 0; i < Cons; i += 1 ) { // generate sentinal values to stop consumers |
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110 | insert( buffer, Sentinel ); |
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111 | } // for |
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112 | int sum = 0; |
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113 | for ( i = 0; i < Cons; i += 1 ) { // wait for consumers to finish |
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114 | delete( cons[i] ); |
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115 | sum += sums[i]; |
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116 | } // for |
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117 | sout | "total:" | sum | endl; |
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118 | } |
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119 | |
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120 | // Local Variables: // |
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121 | // tab-width: 4 // |
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122 | // compile-command: "cfa boundedBufferEXT.c" // |
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123 | // End: // |
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