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From GitBox <...@apache.org>
Subject [GitHub] [incubator-nuttx] patacongo edited a comment on pull request #4193: fs: Change off_t and related types to int64_t if long long is supported
Date Wed, 21 Jul 2021 16:46:50 GMT

patacongo edited a comment on pull request #4193:
URL: https://github.com/apache/incubator-nuttx/pull/4193#issuecomment-884333212


   Another thing that we will have to be careful with is in reading and writing 64-bit values.
 On a 32-bit ARMv7-M CPU, 64-bit access are not atomic.  The CPU can be interrupted or the
task can be suspended between each 32-bit access and this may result in a corrupted access.
   
   Every 64-bit access must be protected so that it completes without modification at the
interrupt level or by other tasks.  sched_lock() is probably sufficient in most non-SMP cases.
 Inside of file system logic, re-entrancy protections may also be sufficient (?)
   


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