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pthreads and exceptions
- From: Jon Rafkind <workmin at ccs dot neu dot edu>
- To: pthreads-win32 at sourceware dot org
- Date: Mon, 07 Jan 2008 08:12:33 -0700
- Subject: pthreads and exceptions
Hi,
I am experiencing an issue with pthreads 2.8.0 and c++ exceptions.
If main spawns thread A and thread A spawns thread B then thread A
throws an exception and tries to catch it, thread B will actually catch
it. I have tried libpthreadGC2.dll and libpthreadGCE2.dll but the
behavior is the same. Is there a way to make right the stack unwinding
behavior match that as on Linux?
Here is an example program which shows the behavior:
#include <stdio.h>
#include <exception>
#include <pthread.h>
using namespace std;
class Fex: public exception{
public:
Fex():exception(){}
};
void * d1_child( void * x ){
try{
int i;
printf( "d1 child running\n" );
for ( i = 0; i < 200000000; i++ ){
}
} catch ( const Fex & f ){
printf( "d1 child fex\n" );
}
printf( "d1 child done\n" );
}
void * d1( void * x ){
try{
pthread_t child;
pthread_create( &child, NULL, d1_child, NULL );
int i;
for ( i = 0; i < 100000000; i++ ){
}
printf( "d1 throwing fex\n" );
throw Fex();
pthread_join( child, NULL );
printf( "d1 joined child\n" );
} catch ( const Fex & f ){
printf( "d1 fex\n" );
}
printf( "d1 done\n" );
return NULL;
}
void * d2( void * x ){
try{
throw Fex();
} catch ( const Fex & f ){
printf( "d2 fex\n" );
}
return NULL;
}
int main(){
pthread_t n1, n2;
pthread_create( &n1, NULL, d1, NULL );
pthread_create( &n2, NULL, d2, NULL );
pthread_join( n1, NULL );
pthread_join( n2, NULL );
}
This will print
d2 fex
d1 child running
d1 throwing fex
d1 child fex
d1 child done
thanks,
jon