osx_compatibility.h

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#ifdef MACOSX

/*******************************************************************
 * This is a bad hack, since a mutex is owned by the locker,
 * while a semaphore not. So we use a passing le baton technique
 * with mutex. This seems to work on macosx that lacks 
 * semaphore implementation. But is not semantically correct.
 *******************************************************************/ 

#define sem_t pthread_mutex_t
#define sem_wait(s) pthread_mutex_lock(s)
#define sem_post(s) pthread_mutex_unlock(s)
#define sem_init(s,a,b) (__extension__(\
        {\
        pthread_mutex_t __tmp = PTHREAD_MUTEX_INITIALIZER;\
        *(s) = __tmp;\
        if((b) == 0)\
                pthread_mutex_lock(s);\
        if((b) > 1 || (b) < 0 )\
                abort();\
        0;\
        }\
))
#define sem_destroy(s) pthread_mutex_destroy(s)

#define snprintf(a,b,c...) (__extension__                       \
                        ({                                      \
                        int __result;                           \
                        if ( a == NULL && b == 0)               \
                                __result = c99_snprintf(c);     \
                        else                                    \
                                __result = snprintf(a,b,c);     \
                        __result; }))

#define vsnprintf(a,b,c,d) (__extension__                       \
                        ({                                      \
                        int __result;                           \
                        if ( a == NULL && b == 0)               \
                                __result = c99_vsnprintf(c,d);\
                        else                                    \
                                __result = vsnprintf(a,b,c,d);  \
                        __result; }))

#endif

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