/usr/include/jellyfish/atomic_gcc.hpp is in libjellyfish-2.0-dev 2.2.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | /* This file is part of Jellyfish.
Jellyfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jellyfish 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 Jellyfish. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __JELLYFISH_ATOMIC_GCC_HPP__
#define __JELLYFISH_ATOMIC_GCC_HPP__
namespace atomic
{
class gcc
{
public:
template<typename T>
static inline T cas(volatile T *ptr, T oval, T nval) {
return __sync_val_compare_and_swap(ptr, oval, nval);
}
template<typename T>
static inline T set(T *ptr, T nval) {
return __sync_lock_test_and_set(ptr, nval);
}
template<typename T>
static inline T add_fetch(volatile T *ptr, T x) {
T ncount = *ptr, count;
do {
count = ncount;
ncount = cas((T *)ptr, count, count + x);
} while(ncount != count);
return count + x;
}
template<typename T>
static inline T fetch_add(volatile T *ptr, T x) {
T ncount = *ptr, count;
do {
count = ncount;
ncount = cas((T *)ptr, count, (T)(count + x));
} while(ncount != count);
return count;
}
template<typename T>
static inline T set_to_max(volatile T *ptr, T x) {
T count = *ptr;
while(x > count) {
T ncount = cas(ptr, count, x);
if(ncount == count)
return x;
count = ncount;
}
return count;
}
};
}
#endif
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