File : a-exetim-darwin.adb
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) 2007-2016, 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 -- --
19 -- --
20 -- --
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 Darwin version of this package
33
34 with Ada.Task_Identification; use Ada.Task_Identification;
35 with Ada.Unchecked_Conversion;
36
37 with System.Tasking;
38 with System.OS_Interface; use System.OS_Interface;
39 with System.Task_Primitives.Operations; use System.Task_Primitives.Operations;
40
41 with Interfaces.C; use Interfaces.C;
42
43 package body Ada.Execution_Time is
44
45 ---------
46 -- "+" --
47 ---------
48
49 function "+"
50 (Left : CPU_Time;
51 Right : Ada.Real_Time.Time_Span) return CPU_Time
52 is
53 use type Ada.Real_Time.Time;
54 begin
55 return CPU_Time (Ada.Real_Time.Time (Left) + Right);
56 end "+";
57
58 function "+"
59 (Left : Ada.Real_Time.Time_Span;
60 Right : CPU_Time) return CPU_Time
61 is
62 use type Ada.Real_Time.Time;
63 begin
64 return CPU_Time (Left + Ada.Real_Time.Time (Right));
65 end "+";
66
67 ---------
68 -- "-" --
69 ---------
70
71 function "-"
72 (Left : CPU_Time;
73 Right : Ada.Real_Time.Time_Span) return CPU_Time
74 is
75 use type Ada.Real_Time.Time;
76 begin
77 return CPU_Time (Ada.Real_Time.Time (Left) - Right);
78 end "-";
79
80 function "-"
81 (Left : CPU_Time;
82 Right : CPU_Time) return Ada.Real_Time.Time_Span
83 is
84 use type Ada.Real_Time.Time;
85 begin
86 return (Ada.Real_Time.Time (Left) - Ada.Real_Time.Time (Right));
87 end "-";
88
89 -----------
90 -- Clock --
91 -----------
92
93 function Clock
94 (T : Ada.Task_Identification.Task_Id :=
95 Ada.Task_Identification.Current_Task) return CPU_Time
96 is
97 function Convert_Ids is new
98 Ada.Unchecked_Conversion (Task_Id, System.Tasking.Task_Id);
99
100 function To_CPU_Time is
101 new Ada.Unchecked_Conversion (Duration, CPU_Time);
102 -- Time is equal to Duration (although it is a private type) and
103 -- CPU_Time is equal to Time.
104
105 subtype integer_t is Interfaces.C.int;
106 subtype mach_port_t is integer_t;
107 -- Type definition for Mach.
108
109 type time_value_t is record
110 seconds : integer_t;
111 microseconds : integer_t;
112 end record;
113 pragma Convention (C, time_value_t);
114 -- Mach time_value_t
115
116 type thread_basic_info_t is record
117 user_time : time_value_t;
118 system_time : time_value_t;
119 cpu_usage : integer_t;
120 policy : integer_t;
121 run_state : integer_t;
122 flags : integer_t;
123 suspend_count : integer_t;
124 sleep_time : integer_t;
125 end record;
126 pragma Convention (C, thread_basic_info_t);
127 -- Mach structure from thread_info.h
128
129 THREAD_BASIC_INFO : constant := 3;
130 THREAD_BASIC_INFO_COUNT : constant := 10;
131 -- Flavors for basic info
132
133 function thread_info (Target : mach_port_t;
134 Flavor : integer_t;
135 Thread_Info : System.Address;
136 Count : System.Address) return integer_t;
137 pragma Import (C, thread_info);
138 -- Mach call to get info on a thread
139
140 function pthread_mach_thread_np (Thread : pthread_t) return mach_port_t;
141 pragma Import (C, pthread_mach_thread_np);
142 -- Get Mach thread from posix thread
143
144 Result : Interfaces.C.int;
145 Thread : pthread_t;
146 Port : mach_port_t;
147 Ti : thread_basic_info_t;
148 Count : integer_t;
149 begin
150 if T = Ada.Task_Identification.Null_Task_Id then
151 raise Program_Error;
152 end if;
153
154 Thread := Get_Thread_Id (Convert_Ids (T));
155 Port := pthread_mach_thread_np (Thread);
156 pragma Assert (Port > 0);
157
158 Count := THREAD_BASIC_INFO_COUNT;
159 Result := thread_info (Port, THREAD_BASIC_INFO,
160 Ti'Address, Count'Address);
161 pragma Assert (Result = 0);
162 pragma Assert (Count = THREAD_BASIC_INFO_COUNT);
163
164 return To_CPU_Time
165 (Duration (Ti.user_time.seconds + Ti.system_time.seconds)
166 + Duration (Ti.user_time.microseconds
167 + Ti.system_time.microseconds) / 1E6);
168 end Clock;
169
170 --------------------------
171 -- Clock_For_Interrupts --
172 --------------------------
173
174 function Clock_For_Interrupts return CPU_Time is
175 begin
176 -- According to AI 0170-1, D.14(18.1/3), if Interrupt_Clocks_Supported
177 -- is set to False the function raises Program_Error.
178
179 raise Program_Error;
180 return CPU_Time_First;
181 end Clock_For_Interrupts;
182
183 -----------
184 -- Split --
185 -----------
186
187 procedure Split
188 (T : CPU_Time;
189 SC : out Ada.Real_Time.Seconds_Count;
190 TS : out Ada.Real_Time.Time_Span)
191 is
192 use type Ada.Real_Time.Time;
193 begin
194 Ada.Real_Time.Split (Ada.Real_Time.Time (T), SC, TS);
195 end Split;
196
197 -------------
198 -- Time_Of --
199 -------------
200
201 function Time_Of
202 (SC : Ada.Real_Time.Seconds_Count;
203 TS : Ada.Real_Time.Time_Span := Ada.Real_Time.Time_Span_Zero)
204 return CPU_Time
205 is
206 begin
207 return CPU_Time (Ada.Real_Time.Time_Of (SC, TS));
208 end Time_Of;
209
210 end Ada.Execution_Time;