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Unhandled exceptions leak
- From: Momchil Velikov <velco at fadata dot bg>
- To: libstdc++ at gcc dot gnu dot org
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Wed, 27 Oct 2004 21:08:11 +0300
- Subject: Unhandled exceptions leak
When a thread is terminated from within an exception handling block,
exception object(s) (__cxa_exeption) are leaked, as the TSD destructor
for __cxa_eh_globals instance does delete them. The following program
demonstrates the leak. A patch and a ChangeLog entry follows.
#include <pthread.h>
static void *
foo (void *p)
{
try
{
throw 0;
}
catch (int)
{
pthread_exit (0);
}
}
int
main ()
{
pthread_t t;
void *p;
pthread_create (&t, 0, foo, 0);
pthread_join (t, &p);
return 0;
}
--- /home/velco/src/gcc-4.0/libstdc++-v3/libsupc++/eh_globals.cc.~1.6.~
Tue Aug 3 09:45:54 2004
+++ /home/velco/src/gcc-4.0/libstdc++-v3/libsupc++/eh_globals.cc Wed Oct
27 20:50:17 2004
@@ -48,7 +48,19 @@
get_globals_dtor (void *ptr)
{
if (ptr)
- std::free (ptr);
+ {
+ __cxa_exception *exn, *next;
+
+ exn = ((__cxa_eh_globals *) ptr)->caughtExceptions;
+ while (exn)
+ {
+ next = exn->nextException;
+ _Unwind_DeleteException (&exn->unwindHeader);
+ exn = next;
+ }
+
+ std::free (ptr);
+ }
}
static void
2004-10-27 Momchil Velikov <velco@fadata.bg>
* libsupc++/eh_globals.cc (get_globals_dtor): Delete unhandled
exceptions.