https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146
--- Comment #2 from Andrey V <andrey.vul at gmail dot com> ---
Replacing throw/try/catch with longjmp/setjmp for non-returning function exit,
like so:
#include <stdio.h>
#include <pthread.h>
#include <setjmp.h>
pthread_once_t flag_ = PTHREAD_ONCE_INIT;
int call_count = 0;
jmp_buf catch_;
void func_() {
printf("Inside func_ call_count %d\n", call_count);
if (++call_count < 2)
longjmp(catch_, 1);
}
int main() {
int signo;
printf("Before calling call_once flag_: %d\n", *(int*)&flag_);
signo = setjmp(catch_);
if (!signo)
pthread_once(&flag_, func_);
else
printf("Inside catch all excepton flag_: %d\n", *(int*)&flag_);
printf("before the 2nd call to call_once flag_: %d\n", *(int*)&flag_);
pthread_once(&flag_, func_);
}
, the invalid behavior isn't triggered.
It appears that pthread_once doesn't take kindly to exceptions in the
once_func.
