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log: workaround mingw's lack of once_flag

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This commit is contained in:
Danny Robson 2019-10-21 12:46:43 +11:00
parent d0d9c3a676
commit 44abca88d6
1 changed files with 6 additions and 3 deletions
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9
log/log.cpp
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@ -43,7 +43,9 @@ cruft::log::needs_break (level_t level)
///////////////////////////////////////////////////////////////////////////////
static std::once_flag s_sink_init;
// mingw#xxx: MinGW doesn't have once_flag so we just use an atomic bool.
// Pray that multiple threads don't run into an issue here.
static std::atomic<bool> s_sink_init;
static std::unique_ptr<cruft::log::sink::base> s_default_sink;
@ -60,11 +62,12 @@ cruft::log::default_sink (std::unique_ptr<sink::base> value)
cruft::log::sink::base&
cruft::log::default_sink ()
{
std::call_once (s_sink_init, [&] () {
if (unlikely (!s_sink_init)) {
default_sink (
std::make_unique<sink::console> (PACKAGE_NAME)
);
});
s_sink_init = true;
}
return *s_default_sink;
}