__rcmtx
struct __rcmtx _lock;
void __rcmtx_init(struct __rcmtx *);
int __rcmtx_enter_try(struct __rcmtx *);
void __rcmtx_enter(struct __rcmtx *);
void __rcmtx_leave(struct __rcmtx *);
__rcmtx_init(struct __rcmtx *rcmtx)
__rcmtx_enter_try(struct __rcmtx *rcmtx)
__rcmtx_enter(struct __rcmtx *rcmtx)
__rcmtx_leave(struct __rcmtx *rcmtx)