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The first prototypes of Linux were publicly released in 1991.
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td_thr_sleepinfo(3cdb) [opensolaris man page]

td_thr_sleepinfo(3C_DB) 				Threads Debugging Library Functions				   td_thr_sleepinfo(3C_DB)

NAME
td_thr_sleepinfo - return the synchronization handle for the object on which a thread is blocked SYNOPSIS
cc [ flag... ] file... -lc_db [ library... ] #include <proc_service.h> #include <thread_db.h> td_err_e td_thr_sleepinfo(const td_thrhandle_t *th_p, td_synchandle_t *sh_p); DESCRIPTION
The td_thr_sleepinfo() function returns in *sh_p the handle of the synchronization object on which a sleeping thread is blocked. RETURN VALUES
TD_OK The call completed successfully. TD_BADTH An invalid thread handle was passed in. TD_DBERR A call to one of the imported interface routines failed. TD_ERR The thread th_p is not blocked on a synchronization object, or a libc_db internal error occurred. ATTRIBUTES
See attributes(5) for description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
libc_db(3LIB), attributes(5) SunOS 5.11 20 Oct 1998 td_thr_sleepinfo(3C_DB)

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