Lec23 Multi Threaded Programming (Arif Butt @ PUCIT)

Lec31 Synchronization among Threads (Arif Butt @ PUCIT)

Multi Threaded Programming

• Sequential Programming vs Concurrent/Parallel Programming
• 3 way to achieve concurrency
  • Multiple single threaded processes → lot of memory and time required for process creation
  • Multiple threads with a single processes
  • Single process multiple events
• Thread is an execution context that is independently scheduled, but shares a single addresses space with other threads of the same process

Similar to process:

• states → new, ready, running, block, terminated
• Only one thread in running state (single CPU)
• can create a child

Diferrences

• no automatic protection in threads
• threads executes within the same address space

share code/data/file

has they on registers and stack

• memset
• printf
• malloc
• free
• write