https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83638
Bug ID: 83638
Summary: atomic_is_lock_free should return false on pa-risc
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: mikulas at artax dot karlin.mff.cuni.cz
Target Milestone: ---
The pa-risc architecture doesn't have atomic instructions, all atomic writes or
modifications require taking a lock. These locks are generated properly,
however, the function atomic_is_lock_free incorrectly returns 1 for primitive
data types.
#include <stdio.h>
#include <stdatomic.h>
_Atomic int a1;
_Atomic long long a2;
_Atomic struct {
int x;
int y;
int z;
} a3;
int main(void)
{
printf("%d\n", atomic_is_lock_free(&a1));
printf("%d\n", atomic_is_lock_free(&a2));
printf("%d\n", atomic_is_lock_free(&a3));
return 0;
}
When you run it, it prints
1
1
0
