man Pages(2): System Calls
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NAME

_lwp_setprivate, _lwp_getprivate - set/get LWP specific storage

SYNOPSIS

#include <sys/lwp.h>
void _lwp_setprivate(void * buffer);
void * _lwp_getprivate(void);

DESCRIPTION

The function _lwp_setprivate( ) stores the value specified by buffer in LWP-private memory that is unique to the calling LWP. This is typically used by thread library implementations to maintain a pointer to information about the thread currently running on the calling LWP.
The function _lwp_getprivate( ) returns the value stored in LWP-private memory.

SEE ALSO

_lwp_makecontext(2)