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My call sequence to MySQL is like this:
Connection1:
create temporary table 'temp_table'...
Connection2:
create temporary table 'temp_table'... (already exists, crash???)
Connection1:
drop table 'temp_table'...
Connection2:
drop table 'temp_table'... (no longer exists, crash???)
Is it possible such a case may happen? Or each connection has its own space for temporary tables so that they (the connections) won’t conflict with others?
No; temporary tables are local to the connection that they’re created by. They aren’t visible to other clients, and separate clients can create temporary tables that shadow each other.