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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ L O C K S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2024-2025, Free Software Foundation, Inc. --
-- --
-- GNAT 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 3, or (at your option) any later ver- --
-- sion. GNAT 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is a POSIX-like version of this package
with Interfaces.C;
with System.OS_Constants;
package System.OS_Locks is
pragma Preelaborate;
type pthread_mutex_t is limited private;
subtype RTS_Lock is pthread_mutex_t;
-- Should be used inside the runtime system. The difference between Lock
-- and the RTS_Lock is that the latter serves only as a semaphore so that
-- we do not check for ceiling violations.
private
subtype char_array is Interfaces.C.char_array;
type pthread_mutex_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
end record;
pragma Convention (C, pthread_mutex_t);
for pthread_mutex_t'Alignment use
Integer'Max (Interfaces.C.unsigned_long'Alignment,
System.Address'Alignment);
-- On some targets (e.g. CHERI), pointers have larger alignment than
-- unsigned_long. On other targets (e.g. some 16-bit targets) long is
-- larger than a pointer. Choose the largest to err on the side of caution.
end System.OS_Locks;
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