MLOCK — C Library Procedures

NAME

mlock, munlock − lock and unlock pages in memory.

int mlock(addr, len)
int munlock(addr, len)
caddr_t addr;
int len;

Mlock takes an address range and locks the associated pages into physical memory.

Munlock takes an address range and unlocks the associated pages so they can be paged out.

Mlock and Munlock return 0 if they are successful. Otherwise they return -1 and an error code is returned in errno.

These functions don’t have much error checking. Pages that are locked down and not unlocked may remain unusable after the process terminates.