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|
------------------------------------------------------------------------------
-- --
-- FLORIST (FSU Implementation of POSIX.5) COMPONENTS --
-- --
-- P O S I X . M U T E X E S --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1996-1997 Florida State University --
-- Copyright (C) 1998-2007, AdaCore --
-- --
-- This file is a component of FLORIST, an implementation of an Ada API --
-- for the POSIX OS services, for use with the GNAT Ada compiler and --
-- the FSU Gnu Ada Runtime Library (GNARL). The interface is intended --
-- to be close to that specified in IEEE STD 1003.5: 1990 and IEEE STD --
-- 1003.5b: 1996. --
-- --
-- FLORIST is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 2, or (at your option) any --
-- later version. FLORIST is distributed in the hope that it will be --
-- useful, but WITHOUT 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. --
-- --
------------------------------------------------------------------------------
with POSIX.Implementation;
package body POSIX.Mutexes is
use POSIX.C;
use POSIX.Implementation;
type Mutexattr_Descriptor is access constant pthread_mutexattr_t;
------------------
-- Initialize --
------------------
function pthread_mutexattr_init
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_init,
pthread_mutexattr_init_LINKNAME);
procedure Initialize (Attr : in out Attributes) is
begin
Check_NZ (pthread_mutexattr_init (Attr.Attr'Unchecked_Access));
end Initialize;
----------------
-- Finalize --
----------------
function pthread_mutexattr_destroy
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_destroy,
pthread_mutexattr_destroy_LINKNAME);
procedure Finalize (Attr : in out Attributes) is
begin
Check_NZ (pthread_mutexattr_destroy (Attr.Attr'Unchecked_Access));
end Finalize;
--------------------------
-- Get_Process_Shared --
--------------------------
function pthread_mutexattr_getpshared
(attr : Mutexattr_Descriptor;
pshared : access int) return int;
pragma Import (C, pthread_mutexattr_getpshared,
pthread_mutexattr_getpshared_LINKNAME);
function Get_Process_Shared (Attr : Attributes)
return Boolean is
Result : aliased int;
begin
Check_NZ (pthread_mutexattr_getpshared
(Attr.Attr'Unchecked_Access, Result'Unchecked_Access));
return Result = PTHREAD_PROCESS_SHARED;
end Get_Process_Shared;
--------------------------
-- Set_Process_Shared --
--------------------------
function pthread_mutexattr_setpshared
(attr : access pthread_mutexattr_t;
pshared : int) return int;
pragma Import (C, pthread_mutexattr_setpshared,
pthread_mutexattr_setpshared_LINKNAME);
To_pshared : constant array (Boolean) of int :=
(True => PTHREAD_PROCESS_SHARED,
False => PTHREAD_PROCESS_PRIVATE);
procedure Set_Process_Shared
(Attr : in out Attributes;
Is_Shared : Boolean := False) is
begin
Check_NZ (pthread_mutexattr_setpshared
(Attr.Attr'Unchecked_Access, To_pshared (Is_Shared)));
end Set_Process_Shared;
--------------------------
-- Set_Locking_Policy --
--------------------------
function pthread_mutexattr_setprotocol
(attr : access pthread_mutexattr_t;
protocol : int) return int;
pragma Import (C, pthread_mutexattr_setprotocol,
pthread_mutexattr_setprotocol_LINKNAME);
To_C_Policy : constant array (Locking_Policy) of int :=
(No_Priority_Inheritance => PTHREAD_PRIO_NONE,
Highest_Blocked_Task => PTHREAD_PRIO_INHERIT,
Highest_Ceiling_Priority => PTHREAD_PRIO_PROTECT);
procedure Set_Locking_Policy
(Attr : in out Attributes;
Locking : Locking_Policy) is
begin
Check_NZ (pthread_mutexattr_setprotocol
(Attr.Attr'Unchecked_Access, To_C_Policy (Locking)));
end Set_Locking_Policy;
--------------------------
-- Get_Locking_Policy --
--------------------------
function pthread_mutexattr_getprotocol
(attr : Mutexattr_Descriptor;
value_ptr : access int) return int;
pragma Import (C, pthread_mutexattr_getprotocol,
pthread_mutexattr_getprotocol_LINKNAME);
function Get_Locking_Policy (Attr : Attributes) return Locking_Policy is
Result : aliased int;
begin
Check_NZ (pthread_mutexattr_getprotocol
(Attr.Attr'Unchecked_Access, Result'Unchecked_Access));
if Result = PTHREAD_PRIO_NONE then
return No_Priority_Inheritance;
elsif Result = PTHREAD_PRIO_INHERIT then
return Highest_Blocked_Task;
elsif Result = PTHREAD_PRIO_PROTECT then
return Highest_Ceiling_Priority;
else
Raise_POSIX_Error (Operation_Not_Supported);
-- to suppress compiler warning
return No_Priority_Inheritance;
end if;
end Get_Locking_Policy;
----------------------------
-- Set_Ceiling_Priority --
----------------------------
function pthread_mutexattr_setprioceiling
(attr : access pthread_mutexattr_t;
prioceiling : int) return int;
pragma Import (C, pthread_mutexattr_setprioceiling,
pthread_mutexattr_setprioceiling_LINKNAME);
procedure Set_Ceiling_Priority
(Attr : in out Attributes;
New_Ceiling : Ceiling_Priority) is
begin
Check_NZ (pthread_mutexattr_setprioceiling
(Attr.Attr'Unchecked_Access, int (New_Ceiling)));
end Set_Ceiling_Priority;
----------------------------
-- Get_Ceiling_Priority --
----------------------------
function pthread_mutexattr_getprioceiling
(attr : Mutexattr_Descriptor;
prioceiling : access int) return int;
pragma Import (C, pthread_mutexattr_getprioceiling,
pthread_mutexattr_getprioceiling_LINKNAME);
function Get_Ceiling_Priority (Attr : Attributes) return Ceiling_Priority is
Result : aliased int;
begin
Check_NZ (pthread_mutexattr_getprioceiling
(Attr.Attr'Unchecked_Access, Result'Unchecked_Access));
return (Ceiling_Priority (Result));
end Get_Ceiling_Priority;
------------------
-- Initialize --
------------------
function pthread_mutex_init
(mutex : access pthread_mutex_t;
attr : Mutexattr_Descriptor) return int;
pragma Import (C, pthread_mutex_init, pthread_mutex_init_LINKNAME);
procedure Initialize
(M : in out Mutex;
Attr : Attributes) is
begin
Check_NZ (pthread_mutex_init
(M.Mutex'Unchecked_Access, Attr.Attr'Unchecked_Access));
end Initialize;
procedure Initialize (M : in out Mutex) is
begin
Check_NZ (pthread_mutex_init (M.Mutex'Unchecked_Access, null));
end Initialize;
---------------------
-- Descriptor_Of --
---------------------
function Descriptor_Of (M : Mutex) return Mutex_Descriptor is
begin
return M.Mutex'Unchecked_Access;
end Descriptor_Of;
----------------
-- Finalize --
----------------
function pthread_mutex_destroy
(mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_destroy,
pthread_mutex_destroy_LINKNAME);
procedure Finalize (M : in out Mutex) is
begin
Check_NZ (pthread_mutex_destroy (M.Mutex'Unchecked_Access));
end Finalize;
----------------------------
-- Set_Ceiling_Priority --
----------------------------
type int_ptr is access all int;
function pthread_mutex_setprioceiling
(mutex : Mutex_Descriptor;
prioceiling : int;
old_ceiling : int_ptr) return int;
pragma Import (C, pthread_mutex_setprioceiling,
pthread_mutex_setprioceiling_LINKNAME);
procedure Set_Ceiling_Priority
(M : Mutex_Descriptor;
New_Ceiling : Ceiling_Priority;
Old_Ceiling : out Ceiling_Priority) is
Result : aliased int;
begin
Check_NZ (pthread_mutex_setprioceiling
(M, int (New_Ceiling), Result'Unchecked_Access));
Old_Ceiling := Ceiling_Priority (Result);
end Set_Ceiling_Priority;
----------------------------
-- Get_Ceiling_Priority --
----------------------------
function pthread_mutex_getprioceiling
(mutex : Mutex_Descriptor;
prioceiling : access int) return int;
pragma Import (C, pthread_mutex_getprioceiling,
pthread_mutex_getprioceiling_LINKNAME);
function Get_Ceiling_Priority (M : Mutex_Descriptor)
return Ceiling_Priority is
Result : aliased int;
begin
Check_NZ (pthread_mutex_getprioceiling (M, Result'Unchecked_Access));
return Ceiling_Priority (Result);
end Get_Ceiling_Priority;
------------
-- Lock --
------------
function pthread_mutex_lock
(mutex : Mutex_Descriptor) return int;
pragma Import (C, pthread_mutex_lock, pthread_mutex_lock_LINKNAME);
procedure Lock (M : Mutex_Descriptor) is
begin
Check_NZ (pthread_mutex_lock (M));
end Lock;
----------------
-- Try_Lock --
----------------
function pthread_mutex_trylock
(mutex : Mutex_Descriptor) return int;
pragma Import (C, pthread_mutex_trylock, pthread_mutex_trylock_LINKNAME);
function Try_Lock (M : Mutex_Descriptor) return Boolean is
Result : constant int := pthread_mutex_trylock (M);
-- Note: pthread_mutex_trylock returns an error code in Result, and
-- does not set errno.
begin
case Result is
when 0 =>
return True;
when EBUSY =>
return False;
when others =>
Raise_POSIX_Error (Error_Code (Result));
end case;
end Try_Lock;
--------------
-- Unlock --
--------------
function pthread_mutex_unlock
(mutex : Mutex_Descriptor) return int;
pragma Import (C, pthread_mutex_unlock,
pthread_mutex_unlock_LINKNAME);
procedure Unlock (M : Mutex_Descriptor) is
begin
Check_NZ (pthread_mutex_unlock (M));
end Unlock;
end POSIX.Mutexes;
|
