I'm not sure what you mean by a conventional safety.
What kind of safety does a revolver have? If you don't want it to go off, you don't pull the trigger. If you do, you pull the trigger. Same with a Glock (assuming there's a round in the chamber).
There are three kinds of safeties built into the Glock to prevent firing not caused by an intentional pull of the trigger.
1) The trigger safety. Prevents the trigger from moving rearward unless pressure is applied to the front center of the trigger.
2) Firing Pin safety. Prevents the firing pin from striking the primer unless the trigger has been pulled. This would prevent a discharge if a mechanical failure caused the firing pin to release from the trigger bar.
3) Drop safety. Helps keep the FP from jarring loose from the trigger bar due to the dropping of the pistol.
If you are asking if there is an external, shooter activated switch to make the pistol "safe," the answer is no. Just like a revolver.
Learn the basic safety rules that apply to shooting *any* firearm; learn the ins and outs of your Glock by reading the manual; get plenty of practice or training as needed. If you are like most owners, you will *love* your Glock.
K