1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- S Y S T E M . O S _ I N T E R F A C E --
9 -- Copyright (C) 1998-2007, Free Software Foundation, Inc. --
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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the DEC Unix version of this package
36 -- This package encapsulates all direct interfaces to OS services
37 -- that are needed by children of System.
40 -- Turn off polling, we do not want ATC polling to take place during
41 -- tasking operations. It causes infinite loops and other problems.
43 with Interfaces.C; use Interfaces.C;
44 with System.Machine_Code; use System.Machine_Code;
46 package body System.OS_Interface is
52 function Get_Stack_Base (thread : pthread_t) return Address is
53 pragma Unreferenced (thread);
62 procedure pthread_init is
71 function pthread_self return pthread_t is
74 Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
76 Outputs => pthread_t'Asm_Output ("=r", Self),
82 ----------------------
83 -- Hide_Yellow_Zone --
84 ----------------------
86 procedure Hide_Unhide_Yellow_Zone (Hide : Boolean) is
87 type Teb_Ptr is access all pthread_teb_t;
89 Res : Interfaces.C.int;
90 pragma Unreferenced (Res);
93 -- Get the Thread Environment Block address
95 Asm ("call_pal 0x9e" & ASCII.LF & ASCII.HT &
97 Outputs => Teb_Ptr'Asm_Output ("=r", Teb),
101 -- Stick a guard page right above the Yellow Zone if it exists
103 if Teb.all.stack_yellow /= Teb.all.stack_guard then
105 Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_ON);
107 Res := mprotect (Teb.all.stack_yellow, Get_Page_Size, PROT_OFF);
110 end Hide_Unhide_Yellow_Zone;
116 function To_Duration (TS : timespec) return Duration is
118 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
125 function To_Timespec (D : Duration) return timespec is
130 S := time_t (Long_Long_Integer (D));
131 F := D - Duration (S);
133 -- If F has negative value due to a round-up, adjust for positive F
141 return timespec'(tv_sec => S,
142 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
145 end System.OS_Interface;