Race Condition within a Thread

If two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.


Demonstrations

The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.

Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.

Example One

The following example demonstrates the weakness.

int foo = 0;
int storenum(int num) {
  static int counter = 0;
  counter++;
  if (num > foo) foo = num;
  return foo;
}
public classRace {

  static int foo = 0;
  public static void main() {


    new Threader().start();
    foo = 1;

  }
  public static class Threader extends Thread {


    public void run() {
      System.out.println(foo);
    }

  }

}

See Also

Comprehensive Categorization: Concurrency

Weaknesses in this category are related to concurrency.

SEI CERT C Coding Standard - Guidelines 14. Concurrency (CON)

Weaknesses in this category are related to the rules and recommendations in the Concurrency (CON) section of the SEI CERT C Coding Standard.

SEI CERT Oracle Secure Coding Standard for Java - Guidelines 08. Visibility and Atomicity (VNA)

Weaknesses in this category are related to the rules and recommendations in the Visibility and Atomicity (VNA) section of the SEI CERT Oracle Secure Coding Standard fo...

Comprehensive CWE Dictionary

This view (slice) covers all the elements in CWE.

Weaknesses Introduced During Implementation

This view (slice) lists weaknesses that can be introduced during implementation.

Weakness Base Elements

This view (slice) displays only weakness base elements.


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