1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include <atomic>
11
12 template <class A, class T>
cmpxchg_weak_loop(A & atomic,T & expected,T desired)13 bool cmpxchg_weak_loop(A& atomic, T& expected, T desired) {
14 for (int i = 0; i < 10; i++) {
15 if (atomic.compare_exchange_weak(expected, desired) == true) {
16 return true;
17 }
18 }
19
20 return false;
21 }
22
23 template <class A, class T>
cmpxchg_weak_loop(A & atomic,T & expected,T desired,std::memory_order success,std::memory_order failure)24 bool cmpxchg_weak_loop(A& atomic, T& expected, T desired,
25 std::memory_order success,
26 std::memory_order failure) {
27 for (int i = 0; i < 10; i++) {
28 if (atomic.compare_exchange_weak(expected, desired, success,
29 failure) == true) {
30 return true;
31 }
32 }
33
34 return false;
35 }
36
37 template <class A, class T>
c_cmpxchg_weak_loop(A * atomic,T * expected,T desired)38 bool c_cmpxchg_weak_loop(A* atomic, T* expected, T desired) {
39 for (int i = 0; i < 10; i++) {
40 if (std::atomic_compare_exchange_weak(atomic, expected, desired) == true) {
41 return true;
42 }
43 }
44
45 return false;
46 }
47
48 template <class A, class T>
c_cmpxchg_weak_loop(A * atomic,T * expected,T desired,std::memory_order success,std::memory_order failure)49 bool c_cmpxchg_weak_loop(A* atomic, T* expected, T desired,
50 std::memory_order success,
51 std::memory_order failure) {
52 for (int i = 0; i < 10; i++) {
53 if (std::atomic_compare_exchange_weak_explicit(atomic, expected, desired,
54 success, failure) == true) {
55 return true;
56 }
57 }
58
59 return false;
60 }
61