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Excerpts from this Manual mysql_thread_init()

my_bool mysql_thread_init(void)


This function must be called early within each created thread to initialize thread-specific variables. However, you may not necessarily need to invoke it explicitly: mysql_thread_init() is automatically called by my_init(), which itself is automatically called by mysql_init(), mysql_library_init(), mysql_server_init(), and mysql_connect(). If you invoke any of those functions, mysql_thread_init() is called for you.

Return Values

Zero for success. Nonzero if an error occurred.

User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
  Posted by Gordon Eldest on August 5, 2012
mysql_thread_init() did crash on my machine, did investigate as mysql_init() is doing it for me.

MORE IMPORTANT remember that:

1) A new thread NEED a SPECIFIC new MYSQL* handle.
So need a call mysql_init() WITHIN your new thread.
(libmysql work badly with exotic error if you use MYSQL* handle from another thread)

Also check
if (!mysql_thread_safe()) {
m_strErrorMessage = "Thread Safe OFF: ";
ASSERT(0); // Major problem: libmysqlcompiled ThreadSafe?

2) you NEED EXPLICTELY to call mysql_thread_end() !!
Do it once you release mysql_close(MYSQL*..)
Or you will get Handle leak !!
(which is as bad as memory leak!)

So no bugs but if multithread carefully read API doc

For reference our destructor of our generci MySqL handler object.

if (m_poMySQLHandle && m_bConnection ){ // Did we use it?
mysql_close(m_poMySQLHandle) ;
mysql_thread_end(); //or 3 Handle leak!
if (--s_ref==0){ // incremented in ::Connect