File : s-osinte.adb
------------------------------------------------------------------------------
-- --
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- B o d y --
-- --
-- $Revision: 1.4 $ --
-- --
-- Copyright (C) 1997-1998 Florida State University --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. It is --
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This is a FSU Threads version of this package
with Interfaces.C;
package body System.OS_Interface is
use Interfaces.C;
---------------
-- Nanosleep --
---------------
function nanosleep (rqtp, rmtp : access timespec) return int is
function nanosleep_base (rqtp, rmtp : access timespec) return int;
pragma Import (C, nanosleep_base, "nanosleep");
Result : int;
begin
Result := nanosleep_base (rqtp, rmtp);
-- FSU implementation of nanosleep set errno to EAGAIN for negative
-- delays.
if errno = EAGAIN then
return 0;
else
return Result;
end if;
end nanosleep;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : timespec) return Duration is
begin
return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
end To_Duration;
function To_Duration (TV : struct_timeval) return Duration is
begin
return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
end To_Duration;
-----------------
-- To_Timespec --
-----------------
function To_Timespec (D : Duration) return timespec is
S : time_t;
F : Duration;
begin
S := time_t (Long_Long_Integer (D));
F := D - Duration (S);
-- If F has negative value due to a round-up, adjust for positive F
-- value.
if F < 0.0 then
S := S - 1;
F := F + 1.0;
end if;
return timespec' (tv_sec => S,
tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
end To_Timespec;
----------------
-- To_Timeval --
----------------
function To_Timeval (D : Duration) return struct_timeval is
S : long;
F : Duration;
begin
S := long (Long_Long_Integer (D));
F := D - Duration (S);
-- If F has negative value due to a round-up, adjust for positive F
-- value.
if F < 0.0 then
S := S - 1;
F := F + 1.0;
end if;
return struct_timeval' (tv_sec => S,
tv_usec => long (Long_Long_Integer (F * 10#1#E6)));
end To_Timeval;
-------------
-- sigwait --
-------------
-- FSU_THREADS has a nonstandard sigwait
function sigwait
(set : access sigset_t;
sig : access Signal)
return int
is
Result : int;
function sigwait_base (set : access sigset_t) return int;
pragma Import (C, sigwait_base, "sigwait");
begin
Result := sigwait_base (set);
if Result = -1 then
sig.all := 0;
return errno;
end if;
sig.all := Signal (Result);
return 0;
end sigwait;
------------------------
-- pthread_mutex_lock --
------------------------
-- FSU_THREADS has nonstandard pthread_mutex_lock and unlock.
-- It sets errno but the standard Posix requires it to be returned.
function pthread_mutex_lock
(mutex : access pthread_mutex_t)
return int
is
function pthread_mutex_lock_base
(mutex : access pthread_mutex_t)
return int;
pragma Import (C, pthread_mutex_lock_base, "pthread_mutex_lock");
Result : int;
begin
Result := pthread_mutex_lock_base (mutex);
if Result /= 0 then
return errno;
end if;
return 0;
end pthread_mutex_lock;
--------------------------
-- pthread_mutex_unlock --
--------------------------
function pthread_mutex_unlock
(mutex : access pthread_mutex_t)
return int
is
function pthread_mutex_unlock_base
(mutex : access pthread_mutex_t)
return int;
pragma Import (C, pthread_mutex_unlock_base, "pthread_mutex_unlock");
Result : int;
begin
Result := pthread_mutex_unlock_base (mutex);
if Result /= 0 then
return errno;
end if;
return 0;
end pthread_mutex_unlock;
-----------------------
-- pthread_cond_wait --
-----------------------
-- FSU_THREADS has a nonstandard pthread_cond_wait.
-- The FSU_THREADS version returns EINTR when interrupted.
function pthread_cond_wait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t)
return int
is
function pthread_cond_wait_base
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t)
return int;
pragma Import (C, pthread_cond_wait_base, "pthread_cond_wait");
Result : int;
begin
Result := pthread_cond_wait_base (cond, mutex);
if Result = EINTR then
return 0;
else
return Result;
end if;
end pthread_cond_wait;
----------------------------
-- pthread_cond_timedwait --
----------------------------
-- FSU_THREADS has a nonstandard pthread_cond_timedwait. The
-- FSU_THREADS version returns -1 and set errno to EAGAIN for timeout.
function pthread_cond_timedwait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t;
abstime : access timespec)
return int
is
function pthread_cond_timedwait_base
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t;
abstime : access timespec)
return int;
pragma Import (C, pthread_cond_timedwait_base, "pthread_cond_timedwait");
Result : int;
begin
Result := pthread_cond_timedwait_base (cond, mutex, abstime);
if Result = -1 then
if errno = EAGAIN then
return ETIMEDOUT;
else
return EINVAL;
end if;
end if;
return 0;
end pthread_cond_timedwait;
--------------------
-- pthread_detach --
--------------------
-- FSU_THREADS has a nonstandard pthread_detach
-- The FSU_THREADS version has a parameter of type
-- "pthread_t *" where the POSIX.1c/D10 version has
-- a parameter of type just "pthread_t".
function pthread_detach (thread : pthread_t) return int is
function pthread_detach_base (thread : access pthread_t) return int;
pragma Import (C, pthread_detach_base, "pthread_detach");
Tmp : aliased pthread_t := thread;
begin
return pthread_detach_base (Tmp'Unchecked_Access);
end pthread_detach;
---------------------------
-- pthread_getschedparam --
---------------------------
-- FSU_THREADS does not have pthread_getschedparam
-- This routine returns a non-negative vaule upon failure
-- but the error code can not be set comforming the POSIX standard.
function pthread_getschedparam
(thread : pthread_t;
policy : access int;
param : access struct_sched_param)
return int
is
-- pthread_attr_getprio is not used, because of shortcut below
-- Declaration is retained here for documentation.
-- function pthread_attr_getprio
-- (attr : access pthread_attr_t)
-- return int;
-- pragma Import (C, pthread_attr_getprio, "pthread_attr_getprio");
function pthread_getschedattr
(thread : pthread_t;
attr : access pthread_attr_t)
return int;
pragma Import (C, pthread_getschedattr, "pthread_getschedattr");
attr : aliased pthread_attr_t;
Result : int;
begin
Result := pthread_attr_init (attr'Access);
if Result /= 0 then
return Result;
end if;
Result := pthread_getschedattr (thread, attr'Access);
if Result /= 0 then
return Result;
end if;
policy.all := attr.sched;
-- Short-cut around pthread_attr_getprio
param.sched_priority := attr.prio;
Result := pthread_attr_destroy (attr'Access);
if Result /= 0 then
return Result;
else
return 0;
end if;
end pthread_getschedparam;
---------------------------
-- pthread_setschedparam --
---------------------------
-- FSU_THREADS does not have pthread_setschedparam
-- This routine returns a non-negative vaule upon failure
-- but the error code can not be set comforming the POSIX standard.
function pthread_setschedparam
(thread : pthread_t;
policy : int;
param : access struct_sched_param)
return int
is
-- ptrhead_attr_setprio is not used, due to shortcut below.
-- Declaration is retained here for documentation.
-- function pthread_attr_setprio
-- (attr : access pthread_attr_t;
-- priority : int)
-- return int;
-- pragma Import (C, pthread_attr_setprio, "pthread_attr_setprio");
function pthread_setschedattr
(thread : pthread_t;
attr : pthread_attr_t) return int;
pragma Import (C, pthread_setschedattr, "pthread_setschedattr");
attr : aliased pthread_attr_t;
Result : int;
begin
Result := pthread_attr_init (attr'Access);
if Result /= 0 then
return Result;
end if;
attr.sched := policy;
-- Short-cut around pthread_attr_setprio
attr.prio := param.sched_priority;
Result := pthread_setschedattr (thread, attr);
if Result /= 0 then
return Result;
end if;
Result := pthread_attr_destroy (attr'Access);
if Result /= 0 then
return Result;
else
return 0;
end if;
end pthread_setschedparam;
-------------------------
-- pthread_getspecific --
-------------------------
-- FSU_THREADS has a nonstandard pthread_getspecific
function pthread_getspecific (key : pthread_key_t) return System.Address is
function pthread_getspecific_base
(key : pthread_key_t;
value : access System.Address)
return int;
pragma Import (C, pthread_getspecific_base, "pthread_getspecific");
Tmp : aliased System.Address;
Result : int;
begin
Result := pthread_getspecific_base (key, Tmp'Access);
if Result /= 0 then
return System.Null_Address;
end if;
return Tmp;
end pthread_getspecific;
---------------------------------
-- pthread_attr_setdetachstate --
---------------------------------
function pthread_attr_setdetachstate
(attr : access pthread_attr_t;
detachstate : int)
return int
is
function pthread_attr_setdetachstate_base
(attr : access pthread_attr_t;
detachstate : access int)
return int;
pragma Import
(C, pthread_attr_setdetachstate_base, "pthread_attr_setdetachstate");
Tmp : aliased int := detachstate;
begin
return pthread_attr_setdetachstate_base (attr, Tmp'Access);
end pthread_attr_setdetachstate;
-----------------
-- sched_yield --
-----------------
-- FSU_THREADS does not have sched_yield;
function sched_yield return int is
procedure sched_yield_base (arg : System.Address);
pragma Import (C, sched_yield_base, "pthread_yield");
begin
sched_yield_base (System.Null_Address);
return 0;
end sched_yield;
----------------
-- Stack_Base --
----------------
function Get_Stack_Base (thread : pthread_t) return Address is
begin
return thread.stack_base;
end Get_Stack_Base;
end System.OS_Interface;