ZOOKEEPER-4810: Fix buf data race at format_endpoint_info() #2140
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format_endpoint_info() is widely called in the IO thread. And the some ZOOAPIs will call this method too: zoo_cycle_next_server() and zoo_get_current_server(). These APIs return the same static buffer read/write by IO thread causes data race.
fanyang89
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kezhuw
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Aug 26, 2024
| @@ -5111,11 +5111,11 @@ int zoo_add_auth(zhandle_t *zh,const char* scheme,const char* cert, | |||
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| static const char* format_endpoint_info(const struct sockaddr_storage* ep) | |||
| { | |||
| static char buf[134] = { 0 }; | |||
| static __thread char buf[134] = { 0 }; | |||
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Do we need a macro here to accommodate single thread version and different compilers ?
cc @ztzg
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__thread will do nothing in st mode, generating the same asm as without it
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format_endpoint_info() is widely called in the IO thread. And the some ZOOAPIs will call this method too: zoo_cycle_next_server() and zoo_get_current_server(). These APIs return the same static buffer read/write by IO thread causes data race.