Attacks of opportunity + readied actions

[Fetchystick]

Say a fighter readies an action that he will attack the first person who enters his range. A barbarian then tries to trip the fighter, provoking an attack of opportunity.

1: Does the fighter effectively get two attacks? One from the readied action and one from the attack of opportunity?
2: In what order does each action occur? Does the attack of opportunity come first because it "interrupts the flow of combat" or does the readied action because the trigger went off?
3: Say the fighter's readied action was instead to disarm anyone who came within range. Would he provoke an attack of opportunity from the barbarian?

[niconorsk]

1: Yes
2: The readied action happens first because the readied trigger(moving in to range) happened before the AOO trigger(attempting to trip)
3: Assuming the fighter doesn't have improve disarm, then yes

[kinevon]

As mentioned, yes.

1st action: Readied attack when the barbarian comes intot he fighter's reach with his weapon, since that matches the trigger.
2nd action: when the barbarian attempts the trip attack, without having Improved Trip, the fighter then gets an AoO prompted by teh trip. His AoO goes off before the trip is rolled.
3rd action: If the fighter attempts to do a disarm, without having Improved Disarm, as his AoO, that provokes an AoO from the barbarian before either the trip or disarm attempt are rolled.

Would it blow your brains out if I could create a situation where the fighter's readied attack gets the fighter another AoO, potentially two AoOs, against the barbarian?

Spoiler:

Give the fighter Improved Trip and Greater Trip, IUS, and Vicious Stomp. As the barbarian moves into reach, the fighter takes a trip, which does not provoke, as his readied attack. If he succeeds in his trip, the tripped barbarian, through the fighter's Greater Trip, provokes an AoO form the fighter, and any of the fighter's allies who also threaten the barbarian. Lastly, as the barbarian lands on the fground prone from being tripped, that provokes an AoO from Vicious Stomp, as an unarmed attack.

Finally, after that, the prone, possibly disarmed, definitely hurt, barbarian finally gets his attack....

I have a couple of fighter builds with both Greater Trip amd Improved Disarm, and 3 or more AoOs from Combat Reflexes, not to mention a reach weapon....