mlockall(3C) — C LIBRARY FUNCTIONS
NAME
mlockall, munlockall − lock or unlock address space
SYNOPSIS
#include <sys/mman.h>
int mlockall(int flags);
int munlockall(void);
DESCRIPTION
The function mlockall causes all pages mapped by an address space to be locked in memory. The effect of mlockall(flags) is equivalent to:
memcntl(0, 0, MC_LOCKAS, flags, 0, 0)
The value of flags determines whether the pages to be locked are those currently mapped by the address space, those that will be mapped in the future, or both:
| MCL_CURRENT | Lock current mappings | |
| MCL_FUTURE | Lock future mappings |
The function munlockall removes address space locks and locks on mappings in the address space. The effect of munlockall is equivalent to:
memcntl(0, 0, MC_UNLOCKAS, 0, 0, 0)
Locks established with mlockall are not inherited by a child process after a fork and are not nested.
SEE ALSO
fork(2), memcntl(2), mlock(3C), mmap(2), plock(2), sysconf(3C)
DIAGNOSTICS
Upon successful completion, the functions mlockall and munlockall return 0; otherwise, they return −1 and set errno to indicate the error.
NOTES
Use of mlockall and munlockall requires that the user have appropriate privileges.