如果从同一文件描述符的两个线程并行调用fwrite
和fclose
会发生什么?
POSIX requires FILE
access to be thread-safe, but since fclose
closes the file and invalidates the pointer, there is no way (ie it's not just a specification issue but a fundamental API issue that could never be "fixed" or made to go away) to use fclose
when another thread might be accessing the FILE
still. You'll need to do your own locking.
fwrite
and fclose
operate on the FILE
data structure. Since this is a largish data structure that does store more than just the file descriptor, the answer is bad things.
Don't do this unless you ensure atomic operation using mutexes.
For such a circumstance you need to define priorities of your methods. You can control the methods with "synchronized".
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