_LWP_GETPRIVATE(2)

_LWP_GETPRIVATE(2) | System Calls Manual | _LWP_GETPRIVATE(2)

# NAME

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

# LIBRARY

Standard C Library (libc, -lc)

# SYNOPSIS

`#include <lwp.h>`

void *
`_lwp_getprivate`(void);

void
`_lwp_setprivate`(void *ptr);

# DESCRIPTION

`_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.

# ERRORS

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

# SEE ALSO

_lwp_makecontext(3)

# HISTORY

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

September 7, 2013 | NetBSD 10.0