id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8730	Race condition in once_block.hpp	Antony Polukhin	Andrey Semashev	"First of all, `once_block_flag` is not thread safe. `status` variable shall be an atomic variable there.

Another issue is `static boost::log::once_block_flag flag_var`. When previous issue will be fixed and  `once_block_flag` will become thread safe, keyword `static` will do bad things in C++03. Static variable `foo_type foo` inside method in C++03 is equal to:

{{{
// In global namespace
bool is_foo_inited = false;
char place_for_foo[sizeof(foo_type)];

// in place where a static variable is used
if (!is_foo_inited) {
    new (place_for_foo) foo_type(some parameters);
    is_foo_inited = true;
}
return reinterpret_cast<foo_type&>(*place_for_foo);
}}}

Beacuse `is_foo_inited` is not atomic and does not act as a spin-lock during initialization - race conditions are possible. "	Bugs	closed	To Be Determined	log	Boost 1.54.0	Problem	fixed	call_once atomics thread log