Passing Arguments to Threads

• Passing Arguments to Threads
• The $pthread\_create()$ function allows the programmer to pass one argument to the thread function.
• For cases where multiple arguments must be passed, this limitation is easily overcome by creating a structure.
• This structure contains all of the arguments, and then a pointer is passed to that structure in the $pthread\_create()$ routine.
• All arguments must be passed by reference and cast to (void *).
• Threads have non-deterministic start-up and scheduling.
• How can you safely pass data to newly created threads?

• Example: Demonstrates how to pass a simple integer to each thread.

  Figure 6.5: Passing single argument to thread function.

  

• Example: Demonstrates how to pass/setup multiple arguments to thread function via a structure.

  Figure 6.6: Passing multiple arguments to thread function via a structure.

  

  Each thread receives a unique instance of the structure.