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Bug 179

Summary: SDL_SemValue() always returns 0 on Mac OS X
Product: SDL Reporter: Christian Walther <cwalther>
Component: threadAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: minor    
Priority: P2    
Version: HG 1.2   
Hardware: PowerPC   
OS: Mac OS X (All)   

Description Christian Walther 2006-03-25 03:10:22 UTC 
SDL_SemValue() always returns 0. That's because the underlying POSIX sem_getvalue() is implemented as a noop in Mac OS X. Apart from that, semaphores do work properly (at least according to test/testsem), so I'm not sure if this is worth fixing at all.

Interestingly, the release notes for SDL 1.1.8 say "Worked around broken sem_getvalue() on MacOS X". How was that done? I can't find the source for 1.1.8 in the CVS.
Comment 1 Sam Lantinga 2006-04-13 10:04:22 UTC 
I think this is fixed in CVS, can you take a look?
Comment 2 Christian Walther 2006-04-14 09:34:29 UTC 
Yep, seems to work.

By the way, I had to make the following change to SDL_config_macosx.h to make SDL compile in Xcode (because of http://libsdl.org/cgi/cvsweb.cgi/SDL12/src/loadso/macosx/SDL_sysloadso.c.diff?r1=1.5&r2=1.6), is this the right thing to do?

 /* Enable various shared object loading systems */
-#define SDL_LOADSO_DLOPEN      1
+#define SDL_LOADSO_DLCOMPAT    1