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added some internal comments about Mmgr::getDFL()

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This commit is contained in:
hyung-hwan 2018-11-01 04:24:32 +00:00
parent ff78a340fb
commit 79b36ec07f
1 changed files with 9 additions and 5 deletions
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14
qse/lib/cmn/Mmgr.cpp
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@ -56,19 +56,22 @@ void* Mmgr::callocate (qse_size_t n, bool raise_exception) QSE_CPP_THREXCEPT1(Me
#if 0
#if defined(__GNUC__)
static StdMmgr __attribute__((init_priority(101))) std_dfl_mmgr;
static StdMmgr __attribute__((init_priority(101))) std_dfl_mmgr; <- this solved the problem
#else
static StdMmgr std_dfl_mmgr;
static StdMmgr std_dfl_mmgr; <-- has an issue for undefined initialization order
#endif
Mmgr* Mmgr::dfl_mmgr = &std_dfl_mmgr;
//Mmgr* Mmgr::dfl_mmgr = StdMmgr::getInstance(); <--- has an issue with initialization order
Mmgr* Mmgr::dfl_mmgr = &std_dfl_mmgr;
//Mmgr* Mmgr::dfl_mmgr = StdMmgr::getInstance(); <--- has an issue as well
Mmgr* Mmgr::getDFL () QSE_CPP_NOEXCEPT
{
return Mmgr::dfl_mmgr;
}
#else
// C++ initialization order across translation units are not defined.
// so it's tricky to work around this... the init_priority attribute
// can solve this problem. but it's compiler dependent.
// Mmgr::getDFL() resets dfl_mmgr to &std_dfl_mmgr if it's NULL.
Mmgr* Mmgr::dfl_mmgr = QSE_NULL;
#endif
Mmgr* Mmgr::getDFL () QSE_CPP_NOEXCEPT
{
@ -76,6 +79,7 @@ Mmgr* Mmgr::getDFL () QSE_CPP_NOEXCEPT
Mmgr* mmgr = Mmgr::dfl_mmgr;
return mmgr? mmgr: &std_dfl_mmgr;
}
#endif
void Mmgr::setDFL (Mmgr* mmgr) QSE_CPP_NOEXCEPT
{