3 * Copyright (C) 2008 Andreas Ă–man
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24 * Atomically add 'incr' to *ptr and return the previous value
26 #if defined(__i386__) || defined(__x86_64__)
28 atomic_add(volatile int *ptr, int incr)
31 asm volatile("lock; xaddl %0, %1" :
32 "=r"(r), "=m"(*ptr) : "0" (incr), "m" (*ptr) : "memory");
37 #endif /* HTSATOMIC_H__ */