navraj.aureliano
Junior
Joined: 29 Aug 2020
Posts: 3
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 Posted: 04/09/2020 16:59 Post subject: Robust C++: Safety Net |
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Rezistent C++: Safety Net
https://www.codeproject.com/Articles/5165710/Robust-Cplusplus-Safety-Net
Keeping a program running when it would otherwise abort
This article presents a Thread class that prevents exceptions (such as those caused by bad pointers) from forcing a program to exit. It also describes how to capture information that facilitates debugging when such errors occur in software already released to users.
| Code: | main_t Thread::Start()
{
for(NO_OP; true; stats_->traps_->Incr())
{
try
{
// Perform any environment-specific initialization (and recovery,
// if reentering the thread). Exit the thread if this fails.
//
auto rc = systhrd_->Start();
if(rc != 0) return Exit(rc);
switch(priv_->traps_)
{
case 0:
break;
case 1:
{
// The thread just trapped. Invoke its virtual Recover function
// in case it needs to clean up unfinished work before resuming
// execution. (The full version of this code is more complex
// because it handles the case where Recover traps.)
//
priv_->traps_ = 0;
Recover();
break;
}
default:
//
// TrapHandler (which appears later) should have prevented us
// from getting here. Exit the thread.
//
return Exit(priv_->signal_);
}
// Invoke the thread's entry function. If this returns,
// the thread exited voluntarily.
//
Enter();
return Exit(SIGNIL);
}
// Catch all exceptions. TrapHandler returns one of
// o Continue, to resume execution at the top of this loop
// o Release, to exit the thread after deleting it
// o Return, to exit the thread immediately
// o Rethrow, to rethrow the exception
//
catch(SignalException& sex)
{
switch(TrapHandler(&sex, &sex, sex.GetSignal(), sex.Stack()))
{
case Continue: continue;
case Release: return Exit(sex.GetSignal());
case Return: return sex.GetSignal();
default: throw;
}
}
catch(Exception& ex)
{
switch(TrapHandler(&ex, &ex, SIGNIL, ex.Stack()))
{
case Continue: continue;
case Release: return Exit(SIGNIL);
case Return: return SIGDELETED;
default: throw;
}
}
catch(std::exception& e)
{
switch(TrapHandler(nullptr, &e, SIGNIL, nullptr))
{
case Continue: continue;
case Release: return Exit(SIGNIL);
case Return: return SIGDELETED;
default: throw;
}
}
catch(...)
{
switch(TrapHandler(nullptr, nullptr, SIGNIL, nullptr))
{
case Continue: continue;
case Release: return Exit(SIGNIL);
case Return: return SIGDELETED;
default: throw;
}
}
}
}
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