msb@sq.UUCP (04/20/87)
Mike Stump (aeusemrs@csun.UUCP) writes: > Well, not to pick on you, but, have you ever done ANY programming using shared > memory, succesfully, and bug free? Just enough to be aware of the problems involved. > Tell me, how would you do something like a > strcpy in such an environment? char *strcpy (to, from) register char *to, *from; { char *start = to; while ((*to++ = *from++)) != 0) ; return start; } But this would be with the understanding that a copy of a string in the process of being changed might produce garbage; any process using strcpy() to lengthen a string would be expected to plant a suitably located NUL first. (Not necessarily at strlen(from)+to; at to+sizeof(tobuffer)-1 would do.) If this isn't sufficient protection, then semaphores or the like become appropriate. > You should just say: ``No one should use shared memory, unless > he/she knows what they are doing'' Well, I can certainly agree with that. Mark Brader