[6cff9f3] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // alarm.c -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Fri Jun 2 11:31:25 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[2a84d06d] | 12 | // Last Modified On : Tue Mar 27 14:12:11 2018 |
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| 13 | // Update Count : 41 |
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[6cff9f3] | 14 | // |
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| 15 | |
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[c81ebf9] | 16 | extern "C" { |
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[82ff5845] | 17 | #include <errno.h> |
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| 18 | #include <stdio.h> |
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| 19 | #include <string.h> |
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| 20 | #include <unistd.h> |
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[c81ebf9] | 21 | #include <sys/time.h> |
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| 22 | } |
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| 23 | |
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[6cff9f3] | 24 | #include "alarm.h" |
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| 25 | #include "kernel_private.h" |
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[c81ebf9] | 26 | #include "preemption.h" |
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[6cff9f3] | 27 | |
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[9236060] | 28 | |
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[2a84d06d] | 29 | static inline void ?{}( itimerval & this, Duration alarm ) with( this ) { |
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| 30 | it_value { alarm }; // seconds, microseconds |
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| 31 | it_interval{ 0 }; |
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[969b3fe] | 32 | } |
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| 33 | |
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[c81ebf9] | 34 | //============================================================================================= |
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| 35 | // Clock logic |
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| 36 | //============================================================================================= |
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| 37 | |
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[2a84d06d] | 38 | Time __kernel_get_time() { |
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[c81ebf9] | 39 | timespec curr; |
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[2a84d06d] | 40 | clock_gettime( CLOCK_MONOTONIC_RAW, &curr ); // CLOCK_REALTIME |
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| 41 | return (Time){ curr }; |
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[c81ebf9] | 42 | } |
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| 43 | |
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[2a84d06d] | 44 | void __kernel_set_timer( Duration alarm ) { |
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| 45 | setitimer( ITIMER_REAL, &(itimerval){ alarm }, NULL ); |
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[6cff9f3] | 46 | } |
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| 47 | |
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[c81ebf9] | 48 | //============================================================================================= |
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| 49 | // Alarm logic |
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| 50 | //============================================================================================= |
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| 51 | |
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[2a84d06d] | 52 | void ?{}( alarm_node_t & this, thread_desc * thrd, Time alarm, Duration period ) with( this ) { |
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[242a902] | 53 | this.thrd = thrd; |
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| 54 | this.alarm = alarm; |
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| 55 | this.period = period; |
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[c40e7c5] | 56 | next = 0; |
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| 57 | set = false; |
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| 58 | kernel_alarm = false; |
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[6cff9f3] | 59 | } |
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| 60 | |
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[2a84d06d] | 61 | void ?{}( alarm_node_t & this, processor * proc, Time alarm, Duration period ) with( this ) { |
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[242a902] | 62 | this.proc = proc; |
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| 63 | this.alarm = alarm; |
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| 64 | this.period = period; |
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[c40e7c5] | 65 | next = 0; |
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| 66 | set = false; |
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| 67 | kernel_alarm = true; |
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[c81ebf9] | 68 | } |
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[6cff9f3] | 69 | |
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[242a902] | 70 | void ^?{}( alarm_node_t & this ) { |
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| 71 | if( this.set ) { |
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| 72 | unregister_self( &this ); |
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[c81ebf9] | 73 | } |
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[6cff9f3] | 74 | } |
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| 75 | |
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[36982fc] | 76 | __cfaabi_dbg_debug_do( bool validate( alarm_list_t * this ) { |
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[4e6fb8e] | 77 | alarm_node_t ** it = &this->head; |
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| 78 | while( (*it) ) { |
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| 79 | it = &(*it)->next; |
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| 80 | } |
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| 81 | |
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| 82 | return it == this->tail; |
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| 83 | }) |
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| 84 | |
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[6cff9f3] | 85 | static inline void insert_at( alarm_list_t * this, alarm_node_t * n, __alarm_it_t p ) { |
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[0b33412] | 86 | verify( !n->next ); |
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[6cff9f3] | 87 | if( p == this->tail ) { |
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| 88 | this->tail = &n->next; |
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| 89 | } |
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| 90 | else { |
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| 91 | n->next = *p; |
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| 92 | } |
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| 93 | *p = n; |
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[4e6fb8e] | 94 | |
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[0b33412] | 95 | verify( validate( this ) ); |
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[6cff9f3] | 96 | } |
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| 97 | |
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| 98 | void insert( alarm_list_t * this, alarm_node_t * n ) { |
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| 99 | alarm_node_t ** it = &this->head; |
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| 100 | while( (*it) && (n->alarm > (*it)->alarm) ) { |
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| 101 | it = &(*it)->next; |
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| 102 | } |
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| 103 | |
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| 104 | insert_at( this, n, it ); |
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[4e6fb8e] | 105 | |
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[0b33412] | 106 | verify( validate( this ) ); |
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[6cff9f3] | 107 | } |
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| 108 | |
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[c81ebf9] | 109 | alarm_node_t * pop( alarm_list_t * this ) { |
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[6cff9f3] | 110 | alarm_node_t * head = this->head; |
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| 111 | if( head ) { |
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| 112 | this->head = head->next; |
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| 113 | if( !head->next ) { |
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| 114 | this->tail = &this->head; |
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| 115 | } |
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| 116 | head->next = NULL; |
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| 117 | } |
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[0b33412] | 118 | verify( validate( this ) ); |
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[6cff9f3] | 119 | return head; |
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[c81ebf9] | 120 | } |
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| 121 | |
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| 122 | static inline void remove_at( alarm_list_t * this, alarm_node_t * n, __alarm_it_t it ) { |
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[4aa2fb2] | 123 | verify( it ); |
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[ec35498] | 124 | verify( (*it) == n ); |
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[c81ebf9] | 125 | |
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[4e6fb8e] | 126 | (*it) = n->next; |
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[c81ebf9] | 127 | if( !n-> next ) { |
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| 128 | this->tail = it; |
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| 129 | } |
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| 130 | n->next = NULL; |
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[4e6fb8e] | 131 | |
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[0b33412] | 132 | verify( validate( this ) ); |
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[c81ebf9] | 133 | } |
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| 134 | |
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| 135 | static inline void remove( alarm_list_t * this, alarm_node_t * n ) { |
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| 136 | alarm_node_t ** it = &this->head; |
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[4e6fb8e] | 137 | while( (*it) && (*it) != n ) { |
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[c81ebf9] | 138 | it = &(*it)->next; |
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| 139 | } |
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| 140 | |
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[0b33412] | 141 | verify( validate( this ) ); |
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[4e6fb8e] | 142 | |
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[c81ebf9] | 143 | if( *it ) { remove_at( this, n, it ); } |
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[4e6fb8e] | 144 | |
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[0b33412] | 145 | verify( validate( this ) ); |
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[c81ebf9] | 146 | } |
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| 147 | |
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| 148 | void register_self( alarm_node_t * this ) { |
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[e60e0dc] | 149 | alarm_list_t * alarms = &event_kernel->alarms; |
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| 150 | |
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[c81ebf9] | 151 | disable_interrupts(); |
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[36982fc] | 152 | lock( event_kernel->lock __cfaabi_dbg_ctx2 ); |
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[c81ebf9] | 153 | { |
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[e60e0dc] | 154 | verify( validate( alarms ) ); |
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| 155 | bool first = !alarms->head; |
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[82ff5845] | 156 | |
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[e60e0dc] | 157 | insert( alarms, this ); |
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[82ff5845] | 158 | if( first ) { |
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[e60e0dc] | 159 | __kernel_set_timer( alarms->head->alarm - __kernel_get_time() ); |
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[82ff5845] | 160 | } |
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[c81ebf9] | 161 | } |
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[ea7d2b0] | 162 | unlock( event_kernel->lock ); |
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[c81ebf9] | 163 | this->set = true; |
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[36982fc] | 164 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[c81ebf9] | 165 | } |
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| 166 | |
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| 167 | void unregister_self( alarm_node_t * this ) { |
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| 168 | disable_interrupts(); |
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[36982fc] | 169 | lock( event_kernel->lock __cfaabi_dbg_ctx2 ); |
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[0b33412] | 170 | { |
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[e60e0dc] | 171 | verify( validate( &event_kernel->alarms ) ); |
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| 172 | remove( &event_kernel->alarms, this ); |
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[0b33412] | 173 | } |
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[ea7d2b0] | 174 | unlock( event_kernel->lock ); |
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[36982fc] | 175 | enable_interrupts( __cfaabi_dbg_ctx ); |
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[c81ebf9] | 176 | this->set = false; |
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[4aa2fb2] | 177 | } |
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[6b0b624] | 178 | |
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| 179 | // Local Variables: // |
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| 180 | // mode: c // |
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| 181 | // tab-width: 4 // |
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| 182 | // End: // |
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