Ada Programming/Libraries/System

Description
The System package is a standard library package provided with each Ada implementation. It includes implementation and system configuration-dependent definitions. The System package contains a standard set of language-defined (but implementation-dependent) types and named numbers.

Types

 * Name
 * Address
 * Priority (also Interrupt_Priority and Any_Priority since Ada 95)
 * Bit_Order (since Ada 95)

Constants
The following named numbers may be set by pragmas. These pragmas may only be used at the start of compilation:
 * System_Name
 * Storage_Unit
 * Memory_Size

The following named numbers are set by the implementation:


 * Null_Address (since Ada 95)
 * Default_Priority (since Ada 95)
 * Default_Bit_Order (since Ada 95)
 * MIN_INT &mdash; the smallest value of all predefined integer types (negative).
 * MAX_INT &mdash; the largest value of all predefined integer types (positive).
 * MAX_BINARY_MODULUS &mdash; the largest power of allowed as the modulus for modular types.
 * MAX_NONBINARY_MODULUS &mdash; the largest value allowed as the modulus for modular types.
 * MAX_BASE_DIGITS &mdash; the largest number of significant decimal digits in a floating point declaration.
 * MAX_DIGITS &mdash; the largest number of significant decimal digits in a floating point declaration without a range specification. This value is at most as large as the previous one.
 * MAX_MANTISSA &mdash; the largest possible number of binary digits in the mantissa of fixed point values.
 * FINE_DELTA &mdash; The smallest delta allowed in a fixed point value (given a range constraint of -1.0 to 1.0).
 * TICK &mdash; the clock period (in seconds).

Standard System packages
The six untagged System packages are from the ISO/IEC 8652:1995(E) standard.


 * (Ada 2012) : This package is available since Ada 2012.


 * (Ada 2022)
 * This package is available since Ada 2022.


 * System
 * System.Address_To_Access_Conversions
 * System.Atomic_Operations (Ada 2022)
 * System.Atomic_Operations.Exchange (Ada 2022)
 * System.Atomic_Operations.Integer_Arithmetic (Ada 2022)
 * System.Atomic_Operations.Modular_Arithmetic (Ada 2022)
 * System.Atomic_Operations.Test_And_Set (Ada 2022)
 * System.Machine_Code
 * System.Multiprocessors (Ada 2012)
 * System.Multiprocessors.Dispatching_Domains (Ada 2012)
 * System.RPC
 * System.Storage_Elements
 * System.Storage_Pools
 * System.Storage_Pools.Subpools (Ada 2012)

GNAT System packages

 * System.Address_Image
 * System.Assertions
 * System.Memory
 * System.Partition_Interface
 * System.Task_Info
 * System.WCh_Cnv
 * System.WCh_Con

The following 200 odd packages form the GNAT runtime environment. They are mentioned here as a reference for advanced users. Normal GNAT users should ignore them because they are internal units of the runtime system.


 * System.Address_Operations
 * System.Arith_64
 * System.AST_Handling
 * System.Aux_DEC
 * System.Bit_Ops
 * System.Boolean_Array_Operations
 * System.Compare_Array_Signed_8
 * System.Compare_Array_Unsigned_8
 * System.Compare_Array_Signed_16
 * System.Compare_Array_Signed_32
 * System.Compare_Array_Signed_64
 * System.Case_Util
 * System.Compare_Array_Unsigned_16
 * System.Compare_Array_Unsigned_32
 * System.Compare_Array_Unsigned_64
 * System.Checked_Pools
 * System.CRC32
 * System.CRTL
 * System.Direct_IO
 * System.Error_Reporting
 * System.Exceptions
 * System.Exception_Table
 * System.Exn_Int
 * System.Exn_LLF
 * System.Exn_LLI
 * System.Exp_Int
 * System.Exp_LLI
 * System.Exp_LLU
 * System.Exp_Mod
 * System.Exp_Uns
 * System.Fat_Flt
 * System.Fat_Gen
 * System.Fat_LFlt
 * System.Fat_LLF
 * System.Fat_SFlt
 * System.File_Control_Block
 * System.File_IO
 * System.Finalization_Implementation
 * System.Finalization_Root
 * System.Fore
 * System.Generic_Vector_Operations
 * System.Global_Locks
 * System.HIE_Back_End
 * System.HTable
 * System.Img_BIU
 * System.Img_Bool
 * System.Img_Char
 * System.Img_Dec
 * System.Img_Enum
 * System.Img_Int
 * System.Img_LLB
 * System.Img_LLD
 * System.Img_LLI
 * System.Img_LLU
 * System.Img_LLW
 * System.Img_Real
 * System.Img_Uns
 * System.Img_WChar
 * System.Img_WIU
 * System.Interrupt_Management.Operations
 * System.Interrupts
 * System.Interrupt_Management
 * System.IO
 * System.Mantissa
 * System.Machine_State_Operations
 * System.Memory_Copy
 * System.OS_Interface
 * System.OS_Primitives
 * System.Pack_03
 * System.Pack_05
 * System.Pack_06
 * System.Pack_07
 * System.Pack_09
 * System.Pack_10
 * System.Pack_11
 * System.Pack_12
 * System.Pack_13
 * System.Pack_14
 * System.Pack_15
 * System.Pack_17
 * System.Pack_18
 * System.Pack_19
 * System.Pack_20
 * System.Pack_21
 * System.Pack_22
 * System.Pack_23
 * System.Pack_24
 * System.Pack_25
 * System.Pack_26
 * System.Pack_27
 * System.Pack_28
 * System.Pack_29
 * System.Pack_30
 * System.Pack_31
 * System.Pack_33
 * System.Pack_34
 * System.Pack_35
 * System.Pack_36
 * System.Pack_37
 * System.Pack_38
 * System.Pack_39
 * System.Pack_40
 * System.Pack_41
 * System.Pack_42
 * System.Pack_43
 * System.Pack_44
 * System.Pack_45
 * System.Pack_46
 * System.Pack_47
 * System.Pack_48
 * System.Pack_49
 * System.Pack_50
 * System.Pack_51
 * System.Pack_52
 * System.Pack_53
 * System.Pack_54
 * System.Pack_55
 * System.Pack_56
 * System.Pack_57
 * System.Pack_58
 * System.Pack_59
 * System.Pack_60
 * System.Pack_61
 * System.Pack_62
 * System.Pack_63
 * System.Parameters
 * System.Pool_Global
 * System.Pool_Local
 * System.Pool_Size
 * System.Powten_Table
 * System.Program_Info
 * System.Pure_Exceptions
 * System.Restrictions
 * System.Rident
 * System.Scalar_Values
 * System.Secondary_Stack
 * System.Sequential_IO
 * System.Shared_Storage
 * System.Soft_Links
 * System.Soft_Links.Tasking
 * System.String_Ops_Concat_3
 * System.String_Ops_Concat_4
 * System.String_Ops_Concat_5
 * System.Stack_Checking
 * System.Standard_Library
 * System.Stack_Checking.Operations
 * System.Stream_Attributes
 * System.String_Compare
 * System.String_Ops
 * System.Tasking.Async_Delays
 * System.Tasking.Entry_Calls
 * System.Tasking.Protected_Objects
 * System.Task_Primitives.Operations
 * System.Tasking.Restricted.Stages
 * System.Tasking.Debug
 * System.Tasking.Initialization
 * System.Tasking
 * System.Task_Primitives
 * System.Tasking.Queuing
 * System.Tasking.Rendezvous
 * System.Tasking.Restricted
 * System.Tasking.Stages
 * System.Tasking.Utilities
 * System.Tasking.Task_Attributes
 * System.Task_Primitives.Interrupt_Operations
 * System.Tasking.Protected_Objects.Entries
 * System.Tasking.Protected_Objects.Operations
 * System.Tasking.Protected_Objects.Single_Entry
 * System.Traceback
 * System.Traces
 * System.Traceback_Entries
 * System.Traces.Tasking
 * System.Unsigned_Types
 * System.Vax_Float_Operations
 * System.Val_Bool
 * System.Val_Char
 * System.Val_Dec
 * System.Val_Enum
 * System.Val_Int
 * System.Val_LLD
 * System.Val_LLI
 * System.Val_LLU
 * System.Val_Real
 * System.Val_Uns
 * System.Val_Util
 * System.Val_WChar
 * System.Vectors.Boolean_Operations
 * System.Vectors
 * System.Version_Control
 * System.VMS_Exception_Table
 * System.WCh_JIS
 * System.WCh_StW
 * System.WCh_WtS
 * System.Wid_Bool
 * System.Wid_Char
 * System.Wid_Enum
 * System.Wid_LLI
 * System.Wid_LLU
 * System.Wid_WChar
 * System.WWd_Char
 * System.WWd_Enum
 * System.Wwd_WChar

Wikibook

 * Ada Programming
 * Ada Programming/Libraries
 * Ada Programming/Libraries/Standard
 * Ada Programming/Libraries/Ada
 * Ada Programming/Libraries/Interfaces

Ada 2005 Reference Manual


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