When modifying shared state in multithreaded code, implement proper checks and state transitions to prevent race conditions. This applies to flags, counters, and resource management.
When modifying shared state in multithreaded code, implement proper checks and state transitions to prevent race conditions. This applies to flags, counters, and resource management.
Bad:
// Don't check flags without thread safety
if (m_terminationFlags & TerminatedFlag) {
// Already terminated, skip work
return;
}
// Race condition: Another thread might have set the flag between check and action
Good:
// Use atomic operations and check the return value
if (atomic_fetch_or(&m_terminationFlags, TerminatedFlag) & TerminatedFlag) {
// Already terminated, skip work
return;
}
// For multi-step processes, track completion:
protectedThis->m_messagesInFlight -= 1;
if (protectedThis->m_messagesInFlight == 0)
protectedThis->close(); // Only close when all messages are processed
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