macOS tips - part 1

This is a repo with the sample code for my blog post:

Tips For macOS Programming - Part 1

Critical sections, reader/writer locks, interactive login sessions, root user detection, CFString conversion.

It covers the following tips:

• Critical Sections
• Reader/Writer Locks
• Conditional Reader/Writer Locks
• Synchronized Access Class
• How To Get The List of Current Interactive Login Sessions
• How To Get Interactive Login Session That This Process Runs In
• How To Convert CFStringRef into std::string
• How To Check If Process Is Running As Root

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Please send your suggestions and corrections here.