Fast Userlevel Locking in Linux

• futex - fast userspace mutex.
• Used to implement basic locking, or as a building block for higher-level locking abstractions like POSIX mutexes, semaphores or condition variables.
  

• futex(7)
• futex(2)
  
• Fuss, Futexes and Furwocks: Fast Userlevel Locking in Linux
• Futexes Are Tricky
• Robust futexes
• Priority Inheritance Futexes