Florian Weimer <fw@xxxxxxxxxxxxx> writes: > * Ian Lance Taylor: > >> Florian Weimer <fw@xxxxxxxxxxxxx> writes: >> >>> I'd like to write a library which only uses locking if the application >>> is linked against pthreads. Is this possible? >> >> Yes, and in fact libsupc++ in gcc does it. You can declare the >> pthread functions as weak references. Then you only call them if the >> address of the function is not NULL. > > Thanks. > > But I'm hosed if a library is loaded later (via dlopen) that pulls in > threads, right? This looks unsupported, so it should be okay if I can't > deal with this situation. Yes, you are probably hosed in that case. Offhand I can't think of any reasonable way to make that work correctly, given that the dlopen might occur when a lock would nominally be held. Ian
