Mercurial > sdl-ios-xcode
comparison src/SDL_compat.c @ 5113:481dabb098ef
Improved timer implementation
The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms.
Goals:
* Minimize timer thread blocking
* Dispatch timers as accurately as possible
* SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe
* SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 27 Jan 2011 14:45:06 -0800 |
| parents | da347bfed240 |
| children | c8e049de174c |
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| 5112:0846f18eb625 | 5113:481dabb098ef |
|---|---|
| 1758 break; | 1758 break; |
| 1759 } | 1759 } |
| 1760 return previous; | 1760 return previous; |
| 1761 } | 1761 } |
| 1762 | 1762 |
| 1763 static Uint32 | |
| 1764 SDL_SetTimerCallback(Uint32 interval, void* param) | |
| 1765 { | |
| 1766 return ((SDL_OldTimerCallback)param)(interval); | |
| 1767 } | |
| 1768 | |
| 1769 int | |
| 1770 SDL_SetTimer(Uint32 interval, SDL_OldTimerCallback callback) | |
| 1771 { | |
| 1772 static SDL_TimerID compat_timer; | |
| 1773 | |
| 1774 if (compat_timer) { | |
| 1775 SDL_RemoveTimer(compat_timer); | |
| 1776 compat_timer = 0; | |
| 1777 } | |
| 1778 | |
| 1779 if (interval && callback) { | |
| 1780 compat_timer = SDL_AddTimer(interval, SDL_SetTimerCallback, callback); | |
| 1781 if (!compat_timer) { | |
| 1782 return -1; | |
| 1783 } | |
| 1784 } | |
| 1785 return 0; | |
| 1786 } | |
| 1787 | |
| 1763 int | 1788 int |
| 1764 SDL_putenv(const char *_var) | 1789 SDL_putenv(const char *_var) |
| 1765 { | 1790 { |
| 1766 char *ptr = NULL; | 1791 char *ptr = NULL; |
| 1767 char *var = SDL_strdup(_var); | 1792 char *var = SDL_strdup(_var); |