21 #ifndef __JackShmMem_POSIX__    22 #define __JackShmMem_POSIX__    24 #include <sys/types.h>    27 #define CHECK_MLOCK(ptr, size) (mlock((ptr), (size)) == 0)    28 #define CHECK_MUNLOCK(ptr, size) (munlock((ptr), (size)) == 0)    29 #define CHECK_MLOCKALL() (mlockall(MCL_CURRENT | MCL_FUTURE) == 0)    30 #define CHECK_MUNLOCKALL() (munlockall() == 0)