NAME

_lwp_getprivate, _lwp_setprivate — get and set light-weight process private data

LIBRARY

Standard C Library (libc, -lc)

#include <lwp.h>

void *
_lwp_getprivate(void);

void
_lwp_setprivate(void *ptr);

_lwp_setprivate() stores the pointer to private data ptr in a location private to the LWP.

_lwp_getprivate() returns the pointer to private data for the LWP.

Some platforms provide alternative ways quicker than _lwp_getprivate() to use the pointer.

alpha: The pointer can be retrieved by call_pal PAL_rdunique.
amd64: The base address of %fs register is set to the pointer so that the private data can be accessed using the selector.
i386: The base address of %gs register is set to the pointer so that the private data can be accessed using the selector.
sparc: %g7 register is set to the pointer.

The _lwp_getprivate() and _lwp_setprivate() functions are always successful, and no return value is reserved to indicate an error.

The _lwp_getprivate() and _lwp_setprivate() system calls first appeared in NetBSD 2.0.