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GET_ROBUST_LIST(2)	      Linux System Calls	    GET_ROBUST_LIST(2)

       get_robust_list, set_robust_list - get/set list of robust futexes

       #include <linux/futex.h>
       #include <syscall.h>

       long get_robust_list(int pid, struct robust_list_head **head_ptr,
			    size_t *len_ptr);
       long set_robust_list(struct robust_list_head *head, size_t len);

       Note: There are no glibc wrappers for these system calls; see NOTES.

       The  robust  futex implementation needs to maintain per-thread lists of
       robust futexes which are unlocked when the thread exits.	  These	 lists
       are  managed in user space; the kernel is notified about only the loca‐
       tion of the head of the list.

       The get_robust_list() system call returns the head of the robust	 futex
       list  of	 the thread whose thread ID is specified in pid.  If pid is 0,
       the head of the list for the calling thread is returned.	 The list head
       is  stored  in  the  location  pointed to by head_ptr.  The size of the
       object pointed to by **head_ptr is stored in len_ptr.

       The set_robust_list() system call requests the  kernel  to  record  the
       head  of	 the  list of robust futexes owned by the calling thread.  The
       head argument is the list head to record.  The len argument  should  be

       The  set_robust_list()  and  get_robust_list() system calls return zero
       when the operation is successful, an error code otherwise.

       The set_robust_list() system call can fail with the following error:

       EINVAL len does not match the size of structure struct robust_list_head
	      expected by kernel.

       The get_robust_list() system call can fail with the following errors:

       EPERM  The  calling  process does not have permission to see the robust
	      futex list of the thread with the thread ID pid,	and  does  not
	      have the CAP_SYS_PTRACE capability.

       ESRCH  No thread with the thread ID pid could be found.

       EFAULT The  head	 of the robust futex list can't be stored at the loca‐
	      tion head.

       These system calls were added in Linux 2.6.17.  No library  support  is
       provided; use syscall(2).

       These  system  calls are not needed by normal applications.  No support
       for them is provided in glibc.  In the unlikely event that you want  to
       call them directly, use syscall(2).

       A  thread  can  have only one robust futex list; therefore applications
       that wish to use this functionality should use the robust mutexes  pro‐
       vided by glibc.


       Documentation/robust-futexes.txt and Documentation/robust-futex-ABI.txt
       in the Linux kernel source tree

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2012-07-13		    GET_ROBUST_LIST(2)

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