Ada Programming/Libraries/System


Ada Lovelace 1838.jpg

DescriptionEdit

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.

TypesEdit

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

ConstantsEdit

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 — the smallest value of all predefined integer types (negative).
  • MAX_INT — the largest value of all predefined integer types (positive).
  • MAX_BINARY_MODULUS — the largest power of allowed as the modulus for modular types.
  • MAX_NONBINARY_MODULUS — the largest value allowed as the modulus for modular types.
  • MAX_BASE_DIGITS — the largest number of significant decimal digits in a floating point declaration.
  • MAX_DIGITS — 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 — the largest possible number of binary digits in the mantissa of fixed point values.
  • FINE_DELTA — The smallest delta allowed in a fixed point value (given a range constraint of -1.0 to 1.0).
  • TICK — the clock period (in seconds).

Child packagesEdit

Standard System packagesEdit

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

  • System
  • System.Address_To_Access_Conversions
  • System.Machine_Code
  • System.RPC
  • System.Storage_Elements
  • System.Storage_Pools

GNAT System packagesEdit

  • 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

See alsoEdit

WikibookEdit

Ada 83 Reference ManualEdit

Ada 95 Reference ManualEdit

Ada 2005 Reference ManualEdit

Last modified on 22 March 2013, at 13:31