_lwp_getprivate(2) - NetBSD Manual Pages

_LWP_GETPRIVATE(2)        NetBSD System Calls Manual        _LWP_GETPRIVATE(2)


NAME

     _lwp_getprivate, _lwp_setprivate -- get and set light-weight process pri-
     vate 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 success-
     ful, 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.

NetBSD 9.2                     September 7, 2013                    NetBSD 9.2