Explain what a race condition is and what are the main difficulties in its occurrence in multithreaded programming

A race condition is a situation in multithreaded programming where multiple threads access a shared resource (such as a variable or file) simultaneously without proper synchronization, and the final result depends on the order in which the threads execute.

Main challenges:

• Unpredictability: the program's outcome can vary from run to run.
• Debugging difficulty: errors are rare and occur randomly, making them hard to detect.
• Data loss or corruption: due to concurrent modifications without locks.

Example: two threads increment a counter simultaneously without synchronization. If both read the old value, increment, and write back, the final value will only increase by 1 instead of 2.

To prevent race conditions, synchronization mechanisms are used: locks (synchronized, Lock), atomic operations, and other tools.