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27494a2 @jdelong Pull from FB rev 63ce89e2f2301e6bba44a111cc7d4218022156f6
jdelong authored
1 /*
2 * Copyright 2012 Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // Some utilities used by AtomicHashArray and AtomicHashMap
18 //
19 // Note: no include guard; different -inl.h files include this and
20 // undef it more than once in a translation unit.
21
22 #if !(defined(__x86__) || defined(__i386__) || defined(__x86_64__))
23 #define FOLLY_SPIN_WAIT(condition) \
24 for (int counter = 0; condition; ++counter) { \
25 if (counter < 10000) continue; \
26 pthread_yield(); \
27 }
28 #else
29 #define FOLLY_SPIN_WAIT(condition) \
30 for (int counter = 0; condition; ++counter) { \
31 if (counter < 10000) { \
32 asm volatile("pause"); \
33 continue; \
34 } \
35 pthread_yield(); \
36 }
37 #endif
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