enter             450 src/libsir/src/sirinternal.c     bool enter = _sir_mapmutexid(mid, &m, &sec) && _sir_mutexlock(m);
enter             451 src/libsir/src/sirinternal.c     SIR_ASSERT(enter);
enter             453 src/libsir/src/sirinternal.c     return enter ? sec : NULL;