SDL Library Documentation
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Chapter 13. Time

Table of Contents
SDL_GetTicks -- Get the number of milliseconds since the SDL library initialization.
SDL_Delay -- Wait a specified number of milliseconds before returning.
SDL_AddTimer -- Add a timer which will call a callback after the specified number of milliseconds has elapsed.
SDL_RemoveTimer -- Remove a timer which was added with SDL_AddTimer.
SDL_SetTimer -- Set a callback to run after the specified number of milliseconds has elapsed.

SDL provides several cross-platform functions for dealing with time. It provides a way to get the current time, a way to wait a little while, and a simple timer mechanism. These functions give you two ways of moving an object every x milliseconds:

Use a timer callback function. This may have the bad effect that it runs in a seperate thread or uses alarm signals, but it's easier to implement.
Or you can get the number of milliseconds passed, and move the object if, for example, 30 ms passed.

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