1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- 4-- -- 5-- S Y S T E M . O S _ I N T E R F A C E -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1997-2018, Free Software Foundation, Inc. -- 10-- -- 11-- GNARL is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNARL was developed by the GNARL team at Florida State University. -- 28-- Extensive contributions were provided by Ada Core Technologies, Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This is the VxWorks version 33 34-- This package encapsulates all direct interfaces to OS services that are 35-- needed by children of System. 36 37pragma Polling (Off); 38-- Turn off polling, we do not want ATC polling to take place during tasking 39-- operations. It causes infinite loops and other problems. 40 41package body System.OS_Interface is 42 43 use type Interfaces.C.int; 44 45 Low_Priority : constant := 255; 46 -- VxWorks native (default) lowest scheduling priority 47 48 ----------------- 49 -- To_Duration -- 50 ----------------- 51 52 function To_Duration (TS : timespec) return Duration is 53 begin 54 return Duration (TS.ts_sec) + Duration (TS.ts_nsec) / 10#1#E9; 55 end To_Duration; 56 57 ----------------- 58 -- To_Timespec -- 59 ----------------- 60 61 function To_Timespec (D : Duration) return timespec is 62 S : time_t; 63 F : Duration; 64 65 begin 66 S := time_t (Long_Long_Integer (D)); 67 F := D - Duration (S); 68 69 -- If F is negative due to a round-up, adjust for positive F value 70 71 if F < 0.0 then 72 S := S - 1; 73 F := F + 1.0; 74 end if; 75 76 return timespec'(ts_sec => S, 77 ts_nsec => long (Long_Long_Integer (F * 10#1#E9))); 78 end To_Timespec; 79 80 ------------------------- 81 -- To_VxWorks_Priority -- 82 ------------------------- 83 84 function To_VxWorks_Priority (Priority : int) return int is 85 begin 86 return Low_Priority - Priority; 87 end To_VxWorks_Priority; 88 89 -------------------- 90 -- To_Clock_Ticks -- 91 -------------------- 92 93 -- ??? - For now, we'll always get the system clock rate since it is 94 -- allowed to be changed during run-time in VxWorks. A better method would 95 -- be to provide an operation to set it that so we can always know its 96 -- value. 97 98 -- Another thing we should probably allow for is a resultant tick count 99 -- greater than int'Last. This should probably be a procedure with two 100 -- output parameters, one in the range 0 .. int'Last, and another 101 -- representing the overflow count. 102 103 function To_Clock_Ticks (D : Duration) return int is 104 Ticks : Long_Long_Integer; 105 Rate_Duration : Duration; 106 Ticks_Duration : Duration; 107 108 begin 109 if D < 0.0 then 110 return ERROR; 111 end if; 112 113 -- Ensure that the duration can be converted to ticks 114 -- at the current clock tick rate without overflowing. 115 116 Rate_Duration := Duration (sysClkRateGet); 117 118 if D > (Duration'Last / Rate_Duration) then 119 Ticks := Long_Long_Integer (int'Last); 120 else 121 Ticks_Duration := D * Rate_Duration; 122 Ticks := Long_Long_Integer (Ticks_Duration); 123 124 if Ticks_Duration > Duration (Ticks) then 125 Ticks := Ticks + 1; 126 end if; 127 128 if Ticks > Long_Long_Integer (int'Last) then 129 Ticks := Long_Long_Integer (int'Last); 130 end if; 131 end if; 132 133 return int (Ticks); 134 end To_Clock_Ticks; 135 136 ----------------------------- 137 -- Binary_Semaphore_Create -- 138 ----------------------------- 139 140 function Binary_Semaphore_Create return Binary_Semaphore_Id is 141 begin 142 return Binary_Semaphore_Id (semBCreate (SEM_Q_FIFO, SEM_EMPTY)); 143 end Binary_Semaphore_Create; 144 145 ----------------------------- 146 -- Binary_Semaphore_Delete -- 147 ----------------------------- 148 149 function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int is 150 begin 151 return semDelete (SEM_ID (ID)); 152 end Binary_Semaphore_Delete; 153 154 ----------------------------- 155 -- Binary_Semaphore_Obtain -- 156 ----------------------------- 157 158 function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int is 159 begin 160 return semTake (SEM_ID (ID), WAIT_FOREVER); 161 end Binary_Semaphore_Obtain; 162 163 ------------------------------ 164 -- Binary_Semaphore_Release -- 165 ------------------------------ 166 167 function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int is 168 begin 169 return semGive (SEM_ID (ID)); 170 end Binary_Semaphore_Release; 171 172 ---------------------------- 173 -- Binary_Semaphore_Flush -- 174 ---------------------------- 175 176 function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int is 177 begin 178 return semFlush (SEM_ID (ID)); 179 end Binary_Semaphore_Flush; 180 181 ---------- 182 -- kill -- 183 ---------- 184 185 function kill (pid : t_id; sig : Signal) return int is 186 begin 187 return System.VxWorks.Ext.kill (pid, int (sig)); 188 end kill; 189 190 ----------------------- 191 -- Interrupt_Connect -- 192 ----------------------- 193 194 function Interrupt_Connect 195 (Vector : Interrupt_Vector; 196 Handler : Interrupt_Handler; 197 Parameter : System.Address := System.Null_Address) return int is 198 begin 199 return 200 System.VxWorks.Ext.Interrupt_Connect 201 (System.VxWorks.Ext.Interrupt_Vector (Vector), 202 System.VxWorks.Ext.Interrupt_Handler (Handler), 203 Parameter); 204 end Interrupt_Connect; 205 206 ----------------------- 207 -- Interrupt_Context -- 208 ----------------------- 209 210 function Interrupt_Context return int is 211 begin 212 return System.VxWorks.Ext.Interrupt_Context; 213 end Interrupt_Context; 214 215 -------------------------------- 216 -- Interrupt_Number_To_Vector -- 217 -------------------------------- 218 219 function Interrupt_Number_To_Vector 220 (intNum : int) return Interrupt_Vector 221 is 222 begin 223 return Interrupt_Vector 224 (System.VxWorks.Ext.Interrupt_Number_To_Vector (intNum)); 225 end Interrupt_Number_To_Vector; 226 227 ----------------- 228 -- Current_CPU -- 229 ----------------- 230 231 function Current_CPU return Multiprocessors.CPU is 232 begin 233 -- ??? Should use vxworks multiprocessor interface 234 235 return Multiprocessors.CPU'First; 236 end Current_CPU; 237 238end System.OS_Interface; 239