Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-osprim__lynxos.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . O S _ P R I M I T I V E S -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1998-2017, 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 package provides low level primitives used to implement clock and | |
| 33 -- delays in non tasking applications, for LynxOS. | |
| 34 | |
| 35 -- The choice of the real clock/delay implementation (depending on whether | |
| 36 -- tasking is involved or not) is done via soft links (see s-soflin.ads) | |
| 37 | |
| 38 -- NEVER add any dependency to tasking packages here | |
| 39 | |
| 40 package System.OS_Primitives is | |
| 41 pragma Preelaborate; | |
| 42 | |
| 43 Max_Sensible_Delay : constant Duration := 16#10_0000.0#; | |
| 44 -- LynxOS does not support delays as long as half a year, so we set this to | |
| 45 -- a shorter, but still fairly long, duration. Experiments show that if | |
| 46 -- pthread_cond_timedwait is passed an abstime much greater than about | |
| 47 -- 2**21, it fails, returning EAGAIN. The cutoff is somewhere between | |
| 48 -- 16#20_8000.0# and 16#20_F000.0#. This behavior is not documented. | |
| 49 | |
| 50 procedure Initialize; | |
| 51 -- Initialize global settings related to this package. This procedure | |
| 52 -- should be called before any other subprograms in this package. Note | |
| 53 -- that this procedure can be called several times. | |
| 54 | |
| 55 function Clock return Duration; | |
| 56 pragma Inline (Clock); | |
| 57 -- Returns "absolute" time, represented as an offset relative to "the | |
| 58 -- Epoch", which is Jan 1, 1970 00:00:00 UTC on UNIX systems. This | |
| 59 -- implementation is affected by system's clock changes. | |
| 60 | |
| 61 Relative : constant := 0; | |
| 62 Absolute_Calendar : constant := 1; | |
| 63 Absolute_RT : constant := 2; | |
| 64 -- Values for Mode call below. Note that the compiler (exp_ch9.adb) relies | |
| 65 -- on these values. So any change here must be reflected in corresponding | |
| 66 -- changes in the compiler. | |
| 67 | |
| 68 procedure Timed_Delay (Time : Duration; Mode : Integer); | |
| 69 -- Implements the semantics of the delay statement when no tasking is used | |
| 70 -- in the application. | |
| 71 -- | |
| 72 -- Mode is one of the three values above | |
| 73 -- | |
| 74 -- Time is a relative or absolute duration value, depending on Mode. | |
| 75 -- | |
| 76 -- Note that currently Ada.Real_Time always uses the tasking run time, | |
| 77 -- so this procedure should never be called with Mode set to Absolute_RT. | |
| 78 -- This may change in future or bare board implementations. | |
| 79 | |
| 80 end System.OS_Primitives; |