_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 8.0