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