Prefer std::atomic over MemoryBarrier #2
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utACK ba8a445 |
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As we use the C++11 atomics in other places in the code, we rely on them already, so using them here as well makes sense, even if just to reduce code duplication. |
sipa
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Jul 12, 2017
ba8a445 Prefer std::atomic over MemoryBarrier (Pieter Wuille) Tree-SHA512: d25e9d2b3d149a16b3083515993f5e9a02576d6a6b58a39bdd3307a099c5656def5ac39d3bb25e9f638830de76b960b409bd8414df1ced3ed22794d8a6ab6f82
laanwj
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Aug 2, 2017
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
sickpig
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Aug 17, 2017
b13a68e Squashed 'src/leveldb/' changes from 196962ff0..c521b3ac6 (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields)
mempko
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Sep 28, 2017
b13a68e Squashed 'src/leveldb/' changes from 196962ff0..c521b3ac6 (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
cculianu
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Oct 5, 2017
Summary: Includes: bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from Bitcoin-ABC#5 (Cory Fields) Removes many warnings on MacOSX of the form: In file included from leveldb/util/cache.cc:10: In file included from ./leveldb/port/port.h:14: In file included from ./leveldb/port/port_posix.h:47: ./leveldb/port/atomic_pointer.h:55:3: warning: 'OSMemoryBarrier' is deprecated: first deprecated in macOS 10.12 - Use std::atomic_thread_fence() from <atomic> instead [-Wdeprecated-declarations] OSMemoryBarrier(); ^ The bitcoin core patches have been included in BU already by sickpig. Test Plan: make check. Installed and running fine. Reviewers: #bitcoin_abc, deadalnix Reviewed By: #bitcoin_abc, deadalnix Differential Revision: https://reviews.bitcoinabc.org/D584
protonn
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Jan 11, 2018
Summary: Includes: bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Removes many warnings on MacOSX of the form: In file included from leveldb/util/cache.cc:10: In file included from ./leveldb/port/port.h:14: In file included from ./leveldb/port/port_posix.h:47: ./leveldb/port/atomic_pointer.h:55:3: warning: 'OSMemoryBarrier' is deprecated: first deprecated in macOS 10.12 - Use std::atomic_thread_fence() from <atomic> instead [-Wdeprecated-declarations] OSMemoryBarrier(); ^ The bitcoin core patches have been included in BU already by sickpig. Test Plan: make check. Installed and running fine. Reviewers: #bitcoin_abc, deadalnix Reviewed By: #bitcoin_abc, deadalnix Differential Revision: https://reviews.bitcoinabc.org/D584
PastaPastaPasta
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Aug 6, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
PastaPastaPasta
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Aug 6, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
PastaPastaPasta
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Aug 6, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
PastaPastaPasta
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Aug 7, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
PastaPastaPasta
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Aug 8, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
PastaPastaPasta
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Aug 12, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
charlesrocket
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Nov 30, 2019
b13a68e Squashed 'src/leveldb/' changes from 196962ff0..c521b3ac6 (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
barrystyle
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Jan 22, 2020
b13a68e Squashed 'src/leveldb/' changes from 196962f..c521b3a (Pieter Wuille) Pull request description: Includes: * bitcoin-core/leveldb-subtree#2: Prefer std::atomic over MemoryBarrier (Pieter Wuille) * bitcoin-core/leveldb-subtree#5: Move helper functions out of sse4.2 object (Cory Fields) * bitcoin-core/leveldb-subtree#6: Fixes typo (Dimitris Tsapakidis) * bitcoin-core/leveldb-subtree#10: Clean up compile-time warnings (gcc 7.1) (Matt Corallo) * bitcoin-core/leveldb-subtree#11: fixup define checks. Cleans up some oopses from #5 (Cory Fields) Tree-SHA512: 2b88a99a86ed8c74c860de13a123ea7f5424d35d314be564820cf83aaae8308383403f7cd56f17c241cfee4885699796141fed666559c21044eaabaeea073315
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Also submitted upstream as google#449
In port/atomic_pointer.h, the preference is to use MemoryBarrier if available, and only fall back to std::atomic if it isn't available.
I believe it would be preferable to use std::atomic, as it may allow better performance, and integrates without changes into ThreadSanitizer.
This PR changes the preference to std::atomic if available.