/* sem.h - isbadsem */ #ifndef NSEM #define NSEM 35 /* number of semaphores, if not defined */ #endif #define SFREE '\01' /* this semaphore is free */ #define SUSED '\02' /* this semaphore is used */ struct sentry { /* semaphore table entry */ char sstate; /* the state SFREE or SUSED */ short semcnt; /* count for this semaphore */ short sqhead; /* q index of head of list */ short sqtail; /* q index of tail of list */ }; extern struct sentry semaph[]; extern int nextsem; #define isbadsem(s) (s<0 || s>=NSEM)