跨进程shm存放rw_lock/spin_lock是否安全 #143

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sixsixQAQ opened this issue Apr 15, 2025 · 1 comment

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bug

sixsixQAQ commented Apr 15, 2025 •

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看到rw_lock和spin_lock好像可以直接放到共享内存shm中，用来同步不同进程的访问。

比较担心不同进程（32位/64位）中rw_lock和spin_lock 的结构体对齐/布局不一致，以及版本兼容问题。

希望可以提供例子，或者更多文档描述。

sixsixQAQ changed the title ~~不同进程shm中用rw_lock和spin_lock是否安全~~ 跨进程shm存放rw_lock/spin_lock是否安全

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mutouyun commented Apr 20, 2025

rw_lock和spin_lock不能混用。目前代码里32位/64位混用确实会出问题，之前疏忽了，内部字段改为uint32_t会更好些。我提个pr吧。
参考：https://www.reddit.com/r/cprogramming/comments/uja192/size_of_unsigned_long_on_32bit_and_64bit_system/

mutouyun added the bug label

mutouyun added a commit that referenced this issue


          Update rw_lock.h for #143

fdcc934

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