| // Copyright 2005-2010 Intel Corporation. All Rights Reserved. |
| // |
| // This file is part of Threading Building Blocks. |
| // |
| // Threading Building Blocks is free software; you can redistribute it |
| // and/or modify it under the terms of the GNU General Public License |
| // version 2 as published by the Free Software Foundation. |
| // |
| // Threading Building Blocks 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 |
| // along with Threading Building Blocks; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| // |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file 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 General Public License. |
| |
| // Support for class TinyLock |
| .section .text |
| .align 16 |
| // unsigned int __TBB_machine_trylockbyte( byte& flag ); |
| // r32 = address of flag |
| .proc __TBB_machine_trylockbyte# |
| .global __TBB_machine_trylockbyte# |
| ADDRESS_OF_FLAG=r32 |
| RETCODE=r8 |
| FLAG=r9 |
| BUSY=r10 |
| SCRATCH=r11 |
| __TBB_machine_trylockbyte: |
| ld1.acq FLAG=[ADDRESS_OF_FLAG] |
| mov BUSY=1 |
| mov RETCODE=0 |
| ;; |
| cmp.ne p6,p0=0,FLAG |
| mov ar.ccv=r0 |
| (p6) br.ret.sptk.many b0 |
| ;; |
| cmpxchg1.acq SCRATCH=[ADDRESS_OF_FLAG],BUSY,ar.ccv // Try to acquire lock |
| ;; |
| cmp.eq p6,p0=0,SCRATCH |
| ;; |
| (p6) mov RETCODE=1 |
| br.ret.sptk.many b0 |
| .endp __TBB_machine_trylockbyte# |
