in src/LttngActivityHelpers.c [151:161]
void lttngh_ActivityIdSet(void const *pNewThreadActivityId) {
struct lttngh_ThreadInfo *pInfo = &ThreadInfo;
memcpy(pInfo->ThreadActivityId, pNewThreadActivityId,
sizeof(pInfo->ThreadActivityId));
if (pInfo->ThreadActivityId[0] | pInfo->ThreadActivityId[1] |
pInfo->ThreadActivityId[2] | pInfo->ThreadActivityId[3]) {
pInfo->ThreadActivityPtr = pInfo->ThreadActivityId;
} else {
pInfo->ThreadActivityPtr = NULL;
}
}