> Don't know if that could help, but I just had a case of PtAppCreatePulse doing
>  a SIGSEGV, I traced it to PtInit being called in a thread that was terminated
>  before the PtAppCreatedPulse was called, note that PtInit was being called 
> again as the second thread that did the PtAppCreatePulse was called but that 
> doesn't seems photon friendly.

Did you by any chance forget to PtEnter() before calling PtAppCreatePulse() in the second thread?  This program works 
for me:

#include <stdio.h>
#include <pthread.h>
#include <Pt.h>

static void *thread( void *arg ) {
        if ( PtInit(NULL) ) {
                perror( "PtInit" );
                exit( 1 );
        }
        return NULL;
}

int main( int argc, char **argv ) {
        int err;
        pthread_t tid;
        if ( ( err = pthread_create( &tid, NULL, thread, NULL ) ) != 0 ) {
                fprintf( stderr, "pthread_create: %s\n", strerror(err) );
        }
        pthread_join( tid, NULL );
        PtEnter(NULL);
        printf( "Pulse is %d\n", PtAppCreatePulse( NULL, -1 ) );
        return 0;
}

PtAppSetResource() solved the problem

Thank you.
Kendall