atomic_flag_test_and_set.s (1510B)
1;-------------------------------------------------------------------------- 2; atomic_flag_test_and_set.s 3; 4; Copyright (C) 2020, Philipp Klaus Krause 5; 6; This library is free software; you can redistribute it and/or modify it 7; under the terms of the GNU General Public License as published by the 8; Free Software Foundation; either version 2, or (at your option) any 9; later version. 10; 11; This library is distributed in the hope that it will be useful, 12; but WITHOUT ANY WARRANTY; without even the implied warranty of 13; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14; GNU General Public License for more details. 15; 16; You should have received a copy of the GNU General Public License 17; along with this library; see the file COPYING. If not, write to the 18; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, 19; MA 02110-1301, USA. 20; 21; As a special exception, if you link this library with other files, 22; some of which are compiled with SDCC, to produce an executable, 23; this library does not by itself cause the resulting executable to 24; be covered by the GNU General Public License. This exception does 25; not however invalidate any other reasons why the executable file 26; might be covered by the GNU General Public License. 27;-------------------------------------------------------------------------- 28 29 .area _CODE 30 31 .globl _atomic_flag_test_and_set 32 33_atomic_flag_test_and_set: 34 pop de 35 pop hl 36 push hl 37 push de 38 xor a, a 39 srl (hl) 40 ccf 41 rla 42 ld l, a 43 ret 44