1 | //--------------------------------------------------------- |
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2 | // Multi wait test |
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3 | // Ensures that no deadlock from waiting/signalling conditions |
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4 | //--------------------------------------------------------- |
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5 | |
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6 | |
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7 | #include <fstream> |
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8 | #include <kernel> |
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9 | #include <monitor> |
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10 | #include <stdlib> |
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11 | #include <thread> |
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12 | |
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13 | #include <time.h> |
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14 | |
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15 | static const unsigned long N = 2_500ul; |
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16 | |
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17 | #ifndef PREEMPTION_RATE |
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18 | #define PREEMPTION_RATE 10_000ul |
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19 | #endif |
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20 | |
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21 | unsigned int default_preemption() { |
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22 | return PREEMPTION_RATE; |
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23 | } |
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24 | |
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25 | monitor global_t {}; |
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26 | |
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27 | global_t globalA; |
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28 | global_t globalB; |
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29 | global_t globalC; |
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30 | |
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31 | condition condAB, condAC, condBC, condABC; |
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32 | |
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33 | thread Signaler {}; |
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34 | thread WaiterAB {}; |
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35 | thread WaiterAC {}; |
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36 | thread WaiterBC {}; |
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37 | thread WaiterABC{}; |
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38 | |
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39 | volatile int waiter_left; |
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40 | |
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41 | //---------------------------------------------------------------------------------------------------- |
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42 | // Tools |
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43 | void signal( condition & cond, global_t & mutex a, global_t & mutex b ) { |
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44 | signal( cond ); |
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45 | } |
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46 | |
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47 | void signal( condition & cond, global_t & mutex a, global_t & mutex b, global_t & mutex c ) { |
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48 | signal( cond ); |
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49 | } |
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50 | |
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51 | void wait( condition & cond, global_t & mutex a, global_t & mutex b ) { |
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52 | wait( cond ); |
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53 | } |
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54 | |
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55 | void wait( condition & cond, global_t & mutex a, global_t & mutex b, global_t & mutex c ) { |
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56 | wait( cond ); |
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57 | } |
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58 | |
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59 | //---------------------------------------------------------------------------------------------------- |
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60 | // Signaler |
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61 | void main( Signaler & this ) { |
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62 | |
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63 | while( waiter_left != 0 ) { |
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64 | unsigned action = random( 4 ); |
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65 | switch( action ) { |
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66 | case 0: |
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67 | signal( condABC, globalA, globalB, globalC ); |
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68 | break; |
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69 | case 1: |
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70 | signal( condAB , globalA, globalB ); |
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71 | break; |
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72 | case 2: |
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73 | signal( condBC , globalB, globalC ); |
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74 | break; |
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75 | case 3: |
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76 | signal( condAC , globalA, globalC ); |
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77 | break; |
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78 | default: |
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79 | sout | "Something went wrong" | endl; |
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80 | abort(); |
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81 | } |
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82 | yield(); |
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83 | } |
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84 | } |
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85 | |
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86 | //---------------------------------------------------------------------------------------------------- |
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87 | // Waiter ABC |
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88 | void main( WaiterABC & this ) { |
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89 | for( int i = 0; i < N; i++ ) { |
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90 | wait( condABC, globalA, globalB, globalC ); |
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91 | } |
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92 | |
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93 | __sync_fetch_and_sub_4( &waiter_left, 1); |
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94 | } |
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95 | |
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96 | //---------------------------------------------------------------------------------------------------- |
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97 | // Waiter AB |
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98 | void main( WaiterAB & this ) { |
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99 | for( int i = 0; i < N; i++ ) { |
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100 | wait( condAB , globalA, globalB ); |
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101 | } |
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102 | |
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103 | __sync_fetch_and_sub_4( &waiter_left, 1); |
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104 | } |
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105 | |
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106 | //---------------------------------------------------------------------------------------------------- |
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107 | // Waiter AC |
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108 | void main( WaiterAC & this ) { |
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109 | for( int i = 0; i < N; i++ ) { |
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110 | wait( condAC , globalA, globalC ); |
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111 | } |
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112 | |
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113 | __sync_fetch_and_sub_4( &waiter_left, 1); |
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114 | } |
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115 | |
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116 | //---------------------------------------------------------------------------------------------------- |
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117 | // Waiter BC |
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118 | void main( WaiterBC & this ) { |
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119 | for( int i = 0; i < N; i++ ) { |
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120 | wait( condBC , globalB, globalC ); |
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121 | } |
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122 | |
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123 | __sync_fetch_and_sub_4( &waiter_left, 1); |
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124 | } |
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125 | |
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126 | //---------------------------------------------------------------------------------------------------- |
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127 | // Main |
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128 | int main(int argc, char* argv[]) { |
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129 | srandom( time( NULL ) ); |
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130 | waiter_left = 4; |
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131 | processor p[2]; |
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132 | sout | "Starting" | endl; |
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133 | { |
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134 | Signaler e; |
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135 | { |
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136 | WaiterABC a; |
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137 | WaiterAB b; |
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138 | WaiterBC c; |
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139 | WaiterAC d; |
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140 | } |
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141 | } |
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142 | sout | "Done" | endl; |
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143 | } |
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