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In light of the recv() and recv_into() implementation change (issue3890), I think we should enable SSL_MODE_AUTO_RETRY for SSL sockets. It prevents blocking read() calls from getting SSL_ERROR_WANT_READ at all.
(previously, we would loop manually in recv() and recv_into(); letting
the C OpenSSL runtime do it for us is certainly more efficient)
See description in
http://www.openssl.org/docs/ssl/SSL_CTX_set_mode.html:
« SSL_MODE_AUTO_RETRY
 Never bother the application with retries if the transport is
 blocking. If a renegotiation take place during normal operation,
 a SSL_read(3) or SSL_write(3) would return with -1 and indicate
 the need to retry with SSL_ERROR_WANT_READ. In a non-blocking
 environment applications must be prepared to handle incomplete
 read/write operations. In a blocking environment, applications
 are not always prepared to deal with read/write operations
 returning without success report. The flag SSL_MODE_AUTO_RETRY
 will cause read/write operations to only return after the
 handshake and successful completion. »