[6cff9f3] | 1 | // -*- Mode: CFA -*- |
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| 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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| 8 | // alarm.c -- |
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| 9 | // |
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| 10 | // Author : Thierry Delisle |
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| 11 | // Created On : Fri Jun 2 11:31:25 2017 |
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| 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : -- |
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| 14 | // Update Count : 0 |
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| 15 | // |
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| 16 | |
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[c81ebf9] | 17 | extern "C" { |
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| 18 | #include <time.h> |
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| 19 | #include <sys/time.h> |
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| 20 | } |
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| 21 | |
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[6cff9f3] | 22 | #include "alarm.h" |
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| 23 | #include "kernel_private.h" |
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[c81ebf9] | 24 | #include "preemption.h" |
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[6cff9f3] | 25 | |
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[c81ebf9] | 26 | //============================================================================================= |
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| 27 | // Clock logic |
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| 28 | //============================================================================================= |
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| 29 | |
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| 30 | __cfa_time_t __kernel_get_time() { |
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| 31 | timespec curr; |
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| 32 | clock_gettime( CLOCK_REALTIME, &curr ); |
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| 33 | return ((__cfa_time_t)curr.tv_sec * TIMEGRAN) + curr.tv_nsec; |
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| 34 | } |
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| 35 | |
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| 36 | void __kernel_set_timer( __cfa_time_t alarm ) { |
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| 37 | itimerval val; |
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| 38 | val.it_value.tv_sec = alarm / TIMEGRAN; // seconds |
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| 39 | val.it_value.tv_usec = (alarm % TIMEGRAN) / ( TIMEGRAN / 1_000_000L ); // microseconds |
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| 40 | val.it_interval.tv_sec = 0; |
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| 41 | val.it_interval.tv_usec = 0; |
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| 42 | setitimer( ITIMER_REAL, &val, NULL ); |
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[6cff9f3] | 43 | } |
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| 44 | |
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[c81ebf9] | 45 | //============================================================================================= |
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| 46 | // Alarm logic |
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| 47 | //============================================================================================= |
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| 48 | |
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| 49 | void ?{}( alarm_node_t * this, thread_desc * thrd, __cfa_time_t alarm = 0, __cfa_time_t period = 0 ) { |
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[6cff9f3] | 50 | this->thrd = thrd; |
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| 51 | this->alarm = alarm; |
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| 52 | this->period = period; |
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| 53 | this->next = 0; |
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[c81ebf9] | 54 | this->set = false; |
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| 55 | this->kernel_alarm = false; |
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[6cff9f3] | 56 | } |
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| 57 | |
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[c81ebf9] | 58 | void ?{}( alarm_node_t * this, processor * proc, __cfa_time_t alarm = 0, __cfa_time_t period = 0 ) { |
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[6cff9f3] | 59 | this->proc = proc; |
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| 60 | this->alarm = alarm; |
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| 61 | this->period = period; |
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| 62 | this->next = 0; |
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[c81ebf9] | 63 | this->set = false; |
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| 64 | this->kernel_alarm = true; |
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| 65 | } |
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[6cff9f3] | 66 | |
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[c81ebf9] | 67 | void ^?{}( alarm_node_t * this ) { |
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| 68 | if( this->set ) { |
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| 69 | unregister_self( this ); |
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| 70 | } |
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[6cff9f3] | 71 | } |
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| 72 | |
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| 73 | static inline void insert_at( alarm_list_t * this, alarm_node_t * n, __alarm_it_t p ) { |
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| 74 | assert( !n->next ); |
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| 75 | if( p == this->tail ) { |
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| 76 | this->tail = &n->next; |
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| 77 | } |
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| 78 | else { |
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| 79 | n->next = *p; |
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| 80 | } |
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| 81 | *p = n; |
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| 82 | } |
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| 83 | |
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| 84 | void insert( alarm_list_t * this, alarm_node_t * n ) { |
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| 85 | alarm_node_t ** it = &this->head; |
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| 86 | while( (*it) && (n->alarm > (*it)->alarm) ) { |
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| 87 | it = &(*it)->next; |
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| 88 | } |
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| 89 | |
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| 90 | insert_at( this, n, it ); |
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| 91 | } |
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| 92 | |
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[c81ebf9] | 93 | alarm_node_t * pop( alarm_list_t * this ) { |
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[6cff9f3] | 94 | alarm_node_t * head = this->head; |
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| 95 | if( head ) { |
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| 96 | this->head = head->next; |
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| 97 | if( !head->next ) { |
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| 98 | this->tail = &this->head; |
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| 99 | } |
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| 100 | head->next = NULL; |
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| 101 | } |
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| 102 | return head; |
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[c81ebf9] | 103 | } |
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| 104 | |
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| 105 | static inline void remove_at( alarm_list_t * this, alarm_node_t * n, __alarm_it_t it ) { |
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| 106 | assert( it ); |
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| 107 | assert( (*it)->next == n ); |
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| 108 | |
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| 109 | (*it)->next = n->next; |
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| 110 | if( !n-> next ) { |
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| 111 | this->tail = it; |
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| 112 | } |
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| 113 | n->next = NULL; |
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| 114 | } |
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| 115 | |
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| 116 | static inline void remove( alarm_list_t * this, alarm_node_t * n ) { |
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| 117 | alarm_node_t ** it = &this->head; |
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| 118 | while( (*it) && (*it)->next != n ) { |
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| 119 | it = &(*it)->next; |
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| 120 | } |
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| 121 | |
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| 122 | if( *it ) { remove_at( this, n, it ); } |
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| 123 | } |
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| 124 | |
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| 125 | void register_self( alarm_node_t * this ) { |
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| 126 | disable_interrupts(); |
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| 127 | assert( !systemProcessor->pending_alarm ); |
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| 128 | lock( &systemProcessor->alarm_lock ); |
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| 129 | { |
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| 130 | insert( &systemProcessor->alarms, this ); |
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| 131 | if( systemProcessor->pending_alarm ) { |
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| 132 | tick_preemption(); |
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| 133 | } |
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| 134 | } |
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| 135 | unlock( &systemProcessor->alarm_lock ); |
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| 136 | this->set = true; |
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| 137 | enable_interrupts(); |
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| 138 | } |
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| 139 | |
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| 140 | void unregister_self( alarm_node_t * this ) { |
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| 141 | disable_interrupts(); |
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| 142 | lock( &systemProcessor->alarm_lock ); |
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| 143 | remove( &systemProcessor->alarms, this ); |
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| 144 | unlock( &systemProcessor->alarm_lock ); |
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| 145 | disable_interrupts(); |
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| 146 | this->set = false; |
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[6cff9f3] | 147 | } |
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