What is Data race?

Data race in the explanations

• A data race occurs when the order of reads and writes to one location is not fixed by synchronization, so the result depends on the order in which they happened to run.

  Which describes a data race?

• This is a textbook data race.

  When two threads run the code above simultaneously, the fin…

• Fetch-and-add performs the read, add and write as one atomic operation, so a single instruction fixes the counter++ data race.

  What does a fetch-and-add instruction, such as RISC-V amoad…

Questions that mention Data race (4)

1. Which describes a data race?
2. When two threads run the code above simultaneously, the final counter can be less than 200000. Why?
3. What does a fetch-and-add instruction, such as RISC-V amoadd.w or x86 lock xadd, do?
4. Which describes a critical section?

Related terms

Critical section ABA problem Acquire-release semantics Atomic instruction Barrier synchronization Bus snooping Compare-and-swap Condition variable Deadlock Directory-based coherence