1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                   A D A . E X E C U T I O N _ T I M E                    --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--         Copyright (C) 2007-2012, Free Software Foundation, Inc.          --
10--                                                                          --
11-- GNAT 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-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This is the Windows native version of this package
33
34with Ada.Task_Identification;           use Ada.Task_Identification;
35with Ada.Unchecked_Conversion;
36
37with System.OS_Interface;               use System.OS_Interface;
38with System.Task_Primitives.Operations; use System.Task_Primitives.Operations;
39with System.Tasking;                    use System.Tasking;
40with System.Win32;                      use System.Win32;
41
42package body Ada.Execution_Time with
43  SPARK_Mode => Off
44is
45
46   ---------
47   -- "+" --
48   ---------
49
50   function "+"
51     (Left  : CPU_Time;
52      Right : Ada.Real_Time.Time_Span) return CPU_Time
53   is
54      use type Ada.Real_Time.Time;
55   begin
56      return CPU_Time (Ada.Real_Time.Time (Left) + Right);
57   end "+";
58
59   function "+"
60     (Left  : Ada.Real_Time.Time_Span;
61      Right : CPU_Time) return CPU_Time
62   is
63      use type Ada.Real_Time.Time;
64   begin
65      return CPU_Time (Left + Ada.Real_Time.Time (Right));
66   end "+";
67
68   ---------
69   -- "-" --
70   ---------
71
72   function "-"
73     (Left  : CPU_Time;
74      Right : Ada.Real_Time.Time_Span) return CPU_Time
75   is
76      use type Ada.Real_Time.Time;
77   begin
78      return CPU_Time (Ada.Real_Time.Time (Left) - Right);
79   end "-";
80
81   function "-"
82     (Left  : CPU_Time;
83      Right : CPU_Time) return Ada.Real_Time.Time_Span
84   is
85      use type Ada.Real_Time.Time;
86   begin
87      return (Ada.Real_Time.Time (Left) - Ada.Real_Time.Time (Right));
88   end "-";
89
90   -----------
91   -- Clock --
92   -----------
93
94   function Clock
95     (T : Ada.Task_Identification.Task_Id :=
96        Ada.Task_Identification.Current_Task) return CPU_Time
97   is
98      Hundreds_Nano_In_Sec : constant Long_Long_Float := 1.0E7;
99
100      function To_Time is new Ada.Unchecked_Conversion
101        (Duration, Ada.Real_Time.Time);
102
103      function To_Task_Id is new Ada.Unchecked_Conversion
104        (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);
105
106      C_Time : aliased Long_Long_Integer;
107      E_Time : aliased Long_Long_Integer;
108      K_Time : aliased Long_Long_Integer;
109      U_Time : aliased Long_Long_Integer;
110      Res    : BOOL;
111
112   begin
113      if T = Ada.Task_Identification.Null_Task_Id then
114         raise Program_Error;
115      end if;
116
117      Res :=
118        GetThreadTimes
119          (HANDLE (Get_Thread_Id (To_Task_Id (T))),
120           C_Time'Access, E_Time'Access, K_Time'Access, U_Time'Access);
121
122      if Res = System.Win32.FALSE then
123         raise Program_Error;
124      end if;
125
126      return
127        CPU_Time
128          (To_Time
129             (Duration
130                ((Long_Long_Float (K_Time) / Hundreds_Nano_In_Sec)
131                 + (Long_Long_Float (U_Time) / Hundreds_Nano_In_Sec))));
132   end Clock;
133
134   --------------------------
135   -- Clock_For_Interrupts --
136   --------------------------
137
138   function Clock_For_Interrupts return CPU_Time is
139   begin
140      --  According to AI 0170-1, D.14(18.1/3), if Interrupt_Clocks_Supported
141      --  is set to False the function raises Program_Error.
142
143      raise Program_Error;
144      return CPU_Time_First;
145   end Clock_For_Interrupts;
146
147   -----------
148   -- Split --
149   -----------
150
151   procedure Split
152     (T  : CPU_Time;
153      SC : out Ada.Real_Time.Seconds_Count;
154      TS : out Ada.Real_Time.Time_Span)
155   is
156      use type Ada.Real_Time.Time;
157   begin
158      Ada.Real_Time.Split (Ada.Real_Time.Time (T), SC, TS);
159   end Split;
160
161   -------------
162   -- Time_Of --
163   -------------
164
165   function Time_Of
166     (SC : Ada.Real_Time.Seconds_Count;
167      TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)
168      return CPU_Time
169   is
170   begin
171      return CPU_Time (Ada.Real_Time.Time_Of (SC, TS));
172   end Time_Of;
173
174end Ada.Execution_Time;
175