1 | //--------------------------------------------------------- |
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2 | // Barging test |
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3 | // Ensures that no barging can occur between : |
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4 | // - the frontend of the signal_block and the signaled thread |
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5 | // - the signaled threadand the backend of the signal_block |
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6 | //--------------------------------------------------------- |
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7 | |
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8 | |
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9 | #include <fstream> |
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10 | #include <kernel> |
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11 | #include <monitor> |
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12 | #include <stdlib> |
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13 | #include <thread> |
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14 | |
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15 | #include <time.h> |
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16 | |
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17 | static const unsigned long N = 5_000ul; |
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18 | |
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19 | #ifndef PREEMPTION_RATE |
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20 | #define PREEMPTION_RATE 10_000ul |
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21 | #endif |
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22 | |
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23 | unsigned int default_preemption() { |
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24 | return PREEMPTION_RATE; |
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25 | } |
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26 | |
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27 | enum state_t { WAITED, SIGNAL, BARGE }; |
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28 | |
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29 | monitor global_data_t { |
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30 | thread_desc * last_thread; |
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31 | thread_desc * last_signaller; |
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32 | }; |
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33 | |
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34 | void ?{} ( global_data_t & this ) { |
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35 | this.last_thread = NULL; |
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36 | this.last_signaller = NULL; |
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37 | } |
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38 | |
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39 | void ^?{} ( global_data_t & this ) {} |
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40 | |
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41 | global_data_t globalA, globalB; |
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42 | |
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43 | condition cond; |
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44 | |
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45 | volatile bool done; |
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46 | |
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47 | //------------------------------------------------------------------------------ |
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48 | void wait_op( global_data_t & mutex a, global_data_t & mutex b, unsigned i ) { |
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49 | wait( cond, (uintptr_t)this_thread ); |
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50 | |
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51 | yield( random( 10 ) ); |
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52 | |
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53 | if(a.last_thread != a.last_signaller || b.last_thread != b.last_signaller ) { |
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54 | sout | "ERROR Barging detected, expected" | a.last_signaller | b.last_signaller | "got" | a.last_thread | b.last_thread | endl; |
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55 | abort(); |
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56 | } |
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57 | |
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58 | a.last_thread = b.last_thread = this_thread; |
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59 | |
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60 | yield( random( 10 ) ); |
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61 | } |
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62 | |
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63 | thread Waiter {}; |
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64 | void main( Waiter & this ) { |
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65 | for( int i = 0; i < N; i++ ) { |
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66 | wait_op( globalA, globalB, i ); |
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67 | } |
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68 | } |
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69 | |
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70 | //------------------------------------------------------------------------------ |
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71 | void signal_op( global_data_t & mutex a, global_data_t & mutex b ) { |
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72 | yield( random( 10 ) ); |
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73 | |
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74 | [a.last_thread, b.last_thread, a.last_signaller, b.last_signaller] = this_thread; |
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75 | |
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76 | if( !is_empty( cond ) ) { |
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77 | |
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78 | thread_desc * next = front( cond ); |
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79 | |
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80 | if( ! signal_block( cond ) ) { |
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81 | sout | "ERROR expected to be able to signal" | endl; |
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82 | abort(); |
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83 | } |
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84 | |
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85 | yield( random( 10 ) ); |
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86 | |
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87 | if(a.last_thread != next || b.last_thread != next) { |
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88 | sout | "ERROR Barging detected, expected" | next | "got" | a.last_thread | b.last_thread | endl; |
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89 | abort(); |
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90 | } |
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91 | } |
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92 | |
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93 | } |
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94 | |
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95 | thread Signaller {}; |
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96 | void main( Signaller & this ) { |
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97 | while( !done ) { |
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98 | signal_op( globalA, globalB ); |
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99 | } |
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100 | } |
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101 | |
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102 | //------------------------------------------------------------------------------ |
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103 | void barge_op( global_data_t & mutex a ) { |
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104 | a.last_thread = this_thread; |
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105 | } |
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106 | |
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107 | thread Barger {}; |
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108 | void main( Barger & this ) { |
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109 | for( unsigned i = 0; !done; i++ ) { |
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110 | //Choose some monitor to barge into with some irregular pattern |
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111 | bool choose_a = (i % 13) > (i % 17); |
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112 | if ( choose_a ) barge_op( globalA ); |
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113 | else barge_op( globalB ); |
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114 | } |
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115 | } |
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116 | |
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117 | //------------------------------------------------------------------------------ |
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118 | |
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119 | int main(int argc, char* argv[]) { |
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120 | random_seed( time( NULL ) ); |
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121 | done = false; |
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122 | processor p; |
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123 | { |
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124 | Signaller s[4]; |
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125 | Barger b[13]; |
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126 | sout | "Starting waiters" | endl; |
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127 | { |
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128 | Waiter w[3]; |
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129 | } |
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130 | sout | "Waiters done" | endl; |
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131 | done = true; |
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132 | } |
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133 | } |
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