Commit ce3a9669 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Jonathan Corbet

robust-futex-ABI.txt: standardize document format

Each text file under Documentation follows a different
format. Some doesn't even have titles!

Change its representation to follow the adopted standard,
using ReST markups for it to be parseable by Sphinx:

- promote document title;
- use :Author: for authorship;
- mark literal blocks;
- add blank lines.
Signed-off-by: default avatarMauro Carvalho Chehab <>
Signed-off-by: default avatarJonathan Corbet <>
parent 317a8455
Started by Paul Jackson <>
The robust futex ABI
:Author: Started by Paul Jackson <>
Robust_futexes provide a mechanism that is used in addition to normal
futexes, for kernel assist of cleanup of held locks on task exit.
......@@ -32,7 +34,7 @@ probably causing deadlock or other such failure of the other threads
waiting on the same locks.
A thread that anticipates possibly using robust_futexes should first
issue the system call:
issue the system call::
asmlinkage long
sys_set_robust_list(struct robust_list_head __user *head, size_t len);
......@@ -91,7 +93,7 @@ that lock using the futex mechanism.
When a thread has invoked the above system call to indicate it
anticipates using robust_futexes, the kernel stores the passed in 'head'
pointer for that task. The task may retrieve that value later on by
using the system call:
using the system call::
asmlinkage long
sys_get_robust_list(int pid, struct robust_list_head __user **head_ptr,
......@@ -135,6 +137,7 @@ manipulating this list), the user code must observe the following
protocol on 'lock entry' insertion and removal:
On insertion:
1) set the 'list_op_pending' word to the address of the 'lock entry'
to be inserted,
2) acquire the futex lock,
......@@ -143,6 +146,7 @@ On insertion:
4) clear the 'list_op_pending' word.
On removal:
1) set the 'list_op_pending' word to the address of the 'lock entry'
to be removed,
2) remove the lock entry for this lock from the 'head' list,
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