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fixed some bugs in the signal related functions of the QSE::App class

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hyung-hwan
2018-09-04 08:46:48 +00:00
parent bb7a03bbc5
commit 82995c9f0d
4 changed files with 112 additions and 37 deletions
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96
qse/lib/si/App.cpp
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@ -34,7 +34,6 @@
QSE_BEGIN_NAMESPACE(QSE)
/////////////////////////////////
static Mutex g_app_mutex;
static App* g_app_top = QSE_NULL; // maintain the chain of application objects
static App* g_app_sig[QSE_NSIGS] = { QSE_NULL, };
@ -61,9 +60,14 @@ App::App (Mmgr* mmgr) QSE_CPP_NOEXCEPT: Mmged(mmgr), _root_only(false), _prev_ap
App::~App () QSE_CPP_NOEXCEPT
{
ScopedMutexLocker sml(g_app_mutex);
this->unsubscribe_from_all_signals_no_mutex ();
if (this->_next_app) this->_next_app->_prev_app = this->_prev_app;
if (this->_prev_app) this->_prev_app->_next_app = this->_next_app;
if (this == g_app_top) g_app_top = this->_next_app;
if (this == g_app_top)
{
QSE_ASSERT (this->_prev_app == QSE_NULL);
g_app_top = this->_next_app;
}
}
int App::daemonize (bool chdir_to_root, int fork_count) QSE_CPP_NOEXCEPT
@ -134,10 +138,9 @@ int App::daemonize (bool chdir_to_root, int fork_count) QSE_CPP_NOEXCEPT
return 0;
}
int App::chroot (const qse_mchar_t* mpath) QSE_CPP_NOEXCEPT
{
return QSE_CHROOT (mpath);
return QSE_CHROOT(mpath);
}
int App::chroot (const qse_wchar_t* wpath) QSE_CPP_NOEXCEPT
@ -145,7 +148,7 @@ int App::chroot (const qse_wchar_t* wpath) QSE_CPP_NOEXCEPT
qse_mchar_t* mpath;
mpath = qse_wcstombsdup (wpath, QSE_NULL, this->getMmgr());
if (!mpath) return -1;
int n = App::chroot ((const qse_mchar_t*)mpath);
int n = App::chroot((const qse_mchar_t*)mpath);
this->getMmgr()->dispose (mpath);
return n;
}
@ -201,8 +204,13 @@ static void dispatch_siginfo (int sig, siginfo_t* si, void* ctx)
}
}
int App::setSignalHandler (int sig, SignalHandler sighr)
{
ScopedMutexLocker sml(g_app_mutex);
return App::set_signal_handler_no_mutex (sig, sighr);
}
int App::set_signal_handler_no_mutex (int sig, SignalHandler sighr)
{
if (App::_sighrs[0][sig]) return -1; // already set
@ -236,6 +244,12 @@ int App::setSignalHandler (int sig, SignalHandler sighr)
}
int App::unsetSignalHandler (int sig)
{
ScopedMutexLocker sml(g_app_mutex);
return App::unset_signal_handler_no_mutex(sig);
}
int App::unset_signal_handler_no_mutex(int sig)
{
if (!App::_sighrs[0][sig]) return -1;
@ -268,7 +282,7 @@ static void handle_signal (int sig)
}
}
void App::handleSignal (int sig, bool accept)
int App::subscribeToSignal (int sig, bool accept)
{
QSE_ASSERT (sig >= 0 && sig < QSE_NSIGS);
@ -278,31 +292,56 @@ void App::handleSignal (int sig, bool accept)
_SigLink& sl = this->_sig[sig];
if (QSE_LIKELY(sl._state == _SigLink::UNHANDLED))
{
if (!g_app_sig[sig])
QSE_ASSERT (sl._prev == QSE_NULL && sl._next == QSE_NULL);
App* xapp = g_app_sig[sig];
App* xapp_xprev = QSE_NULL;
g_app_sig[sig] = this;
sl._state = _SigLink::ACCEPTED;
sl._next = xapp;
if (xapp)
{
xapp_xprev = xapp->_sig[sig]._prev;
xapp->_sig[sig]._prev = this;
}
else
{
// no application is set to accept this signal.
// this is the first time to
App::setSignalHandler (sig, handle_signal);
if (App::set_signal_handler_no_mutex(sig, handle_signal) <= -1)
{
// roll back
g_app_sig[sig] = xapp;
if (xapp) xapp->_sig[sig]._prev = xapp_xprev;
sl._state = _SigLink::UNHANDLED;
sl._next = QSE_NULL;
QSE_ASSERT (sl._prev == QSE_NULL);
return -1;
}
}
sl._state = _SigLink::ACCEPTED;
sl._next = g_app_sig[sig];
g_app_sig[sig] = this;
QSE_ASSERT (sl._prev == QSE_NULL);
}
else
{
// already configured to receive the signal.
// already configured to receive the signal. change the state only
QSE_ASSERT (g_app_sig[sig] != QSE_NULL);
sl._state = reqstate;
}
return 0;
}
void App::unhandleSignal (int sig)
void App::unsubscribeFromSignal (int sig)
{
QSE_ASSERT (sig >= 0 && sig < QSE_NSIGS);
ScopedMutexLocker sml(g_app_mutex);
this->unsubscribe_from_signal_no_mutex (sig);
}
void App::unsubscribe_from_signal_no_mutex (int sig)
{
_SigLink& sl = this->_sig[sig];
if (QSE_UNLIKELY(sl._state == _SigLink::UNHANDLED))
{
@ -314,24 +353,29 @@ void App::unhandleSignal (int sig)
{
QSE_ASSERT (g_app_sig[sig] != QSE_NULL);
if (g_app_sig[sig] == this) g_app_sig[sig] = sl._next;
if (sl._next)
if (g_app_sig[sig] == this)
{
sl._next->_sig[sig]._prev = sl._prev;
sl._next = QSE_NULL;
}
if (sl._prev)
{
sl._prev->_sig[sig]._next = sl._next;
sl._prev = QSE_NULL;
QSE_ASSERT (sl._prev == QSE_NULL);
g_app_sig[sig] = sl._next;
}
if (!g_app_sig[sig]) App::unsetSignalHandler (sig);
if (sl._next) sl._next->_sig[sig]._prev = sl._prev;
if (sl._prev) sl._prev->_sig[sig]._next = sl._next;
sl._prev = QSE_NULL;
sl._next = QSE_NULL;
if (!g_app_sig[sig]) App::unset_signal_handler_no_mutex (sig);
sl._state = _SigLink::UNHANDLED;
}
}
void App::unsubscribe_from_all_signals_no_mutex()
{
for (int i = 0; i < QSE_NSIGS; i++)
{
this->unsubscribe_from_signal_no_mutex (i);
}
}
/////////////////////////////////
QSE_END_NAMESPACE(QSE)
/////////////////////////////////