ssl: prevent string buffers from being modified outside #sys{read,write} #453
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ssl: create a temporary frozen string buffer when writing
Since a blocking SSLSocket#syswrite call allows context switches while
waiting for the underlying socket to be ready, we must freeze the string
buffer to prevent other threads from modifying it.
Reference: #452
ssl: temporary lock string buffer while reading
Similarly to SSLSocket#syswrite, the blocking SSLSocket#sysread allows
context switches. We must prevent other threads from modifying the
string buffer.
We can use rb_str_locktmp() and rb_str_unlocktmp() to temporarily
prohibit modification of the string.