in cxx/fbjni/detail/Environment.cpp [126:140]
tls_key_t makeKey() {
tls_key_t key;
#ifndef _WIN32
int ret = pthread_key_create(&key, nullptr);
if (ret != 0) {
FBJNI_LOGF("pthread_key_create failed: %d", ret);
}
#else
key = TlsAlloc();
if (key == TLS_OUT_OF_INDEXES) {
FBJNI_LOGF("TlsAlloc failed");
}
#endif
return key;
}