What does TSRMLS_CC at the end of some function parameters in PHP source code mean?

Question

For example, in the following code, what does Z_LVAL_PP(arg) followed by TSRMLS_CC mean?

zend_rsrc_list_get_rsrc_type(Z_LVAL_PP(arg) TSRMLS_CC);

Answer 1

The ones starting with TSRM seem to be macros for thread-safe resource management