| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
