Defined in 4 files as a macro:
- contrib/ntp/lib/isc/nothreads/include/isc/mutex.h, line 37 (as a macro)
- contrib/ntp/lib/isc/pthreads/include/isc/mutex.h, line 122 (as a macro)
- contrib/ntp/lib/isc/pthreads/include/isc/mutex.h, line 124 (as a macro)
- contrib/ntp/lib/isc/win32/include/isc/mutex.h, line 53 (as a macro)