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 <[EMAIL PROTECTED]>
* libsupc++/eh_globals.cc (get_globals_dtor): Delete unhandled
exceptions.
--
Summary: Unhandled exceptions leak
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: velco at fadata dot bg
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18185
