Victim_mutex_solution.sol

pragma solidity ^0.4.8;

contract Victim {
  bool locked;
  
  /** 
    @dev Modifier to insure that functions cannot be reentered 
         during execution. Note there is only one global "locked" var, so 
         there is a potential to be locked out of all functions that use 
         the modifier at the same time.
  */ 
  modifier noReentrancy() {
    require(!locked);
    locked = true;
    _;
    locked = false;
  }
  
  function withdraw() noReentrancy {
    uint transferAmt = 1 ether; 
    if (!msg.sender.call.value(transferAmt)()) throw; 
  }

  function deposit() payable {}
}