1/*
2 Copyright 2005-2013 Intel Corporation. All Rights Reserved.
3
4 This file is part of Threading Building Blocks.
5
6 Threading Building Blocks is free software; you can redistribute it
7 and/or modify it under the terms of the GNU General Public License
8 version 2 as published by the Free Software Foundation.
9
10 Threading Building Blocks is distributed in the hope that it will be
11 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
12 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with Threading Building Blocks; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 As a special exception, you may use this file as part of a free software
20 library without restriction. Specifically, if other files instantiate
21 templates or use macros or inline functions from this file, or you compile
22 this file and link it with other files to produce an executable, this
23 file does not by itself cause the resulting executable to be covered by
24 the GNU General Public License. This exception does not however
25 invalidate any other reasons why the executable file might be covered by
26 the GNU General Public License.
27*/
28
29#if !defined(__TBB_machine_H) || defined(__TBB_machine_gcc_itsx_H)
30#error Do not #include this internal file directly; use public TBB headers instead.
31#endif
32
33#define __TBB_machine_gcc_itsx_H
34
35#define __TBB_OP_XACQUIRE 0xF2
36#define __TBB_OP_XRELEASE 0xF3
37#define __TBB_OP_LOCK 0xF0
38
39#define __TBB_STRINGIZE_INTERNAL(arg) #arg
40#define __TBB_STRINGIZE(arg) __TBB_STRINGIZE_INTERNAL(arg)
41
42#ifdef __TBB_x86_64
43#define __TBB_r_out "=r"
44#else
45#define __TBB_r_out "=q"
46#endif
47
48inline static uint8_t __TBB_machine_try_lock_elided( volatile uint8_t* lk )
49{
50 uint8_t value = 1;
51 __asm__ volatile (".byte " __TBB_STRINGIZE(__TBB_OP_XACQUIRE)"; lock; xchgb %0, %1;"
52 : __TBB_r_out(value), "=m"(*lk) : "0"(value), "m"(*lk) : "memory" );
53 return uint8_t(value^1);
54}
55
56inline static void __TBB_machine_try_lock_elided_cancel()
57{
58 // 'pause' instruction aborts HLE/RTM transactions
59 __asm__ volatile ("pause\n" : : : "memory" );
60}
61
62inline static void __TBB_machine_unlock_elided( volatile uint8_t* lk )
63{
64 __asm__ volatile (".byte " __TBB_STRINGIZE(__TBB_OP_XRELEASE)"; movb $0, %0"
65 : "=m"(*lk) : "m"(*lk) : "memory" );
66}
67