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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 22:58:58 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 22:58:58 +0300 |
commit | 486088bc4689f826b80aa317b45ac9e42e8b25ee (patch) | |
tree | adf5847a6119d24da990d9e336f005c4a316e6be /Documentation/robust-futex-ABI.txt | |
parent | 52f6c588c77b76d548201470c2a28263a41b462b (diff) | |
parent | 43e5f7e1fa66531777c49791014c3124ea9208d8 (diff) | |
download | linux-486088bc4689f826b80aa317b45ac9e42e8b25ee.tar.xz |
Merge tag 'standardize-docs' of git://git.lwn.net/linux
Pull documentation format standardization from Jonathan Corbet:
"This series converts a number of top-level documents to the RST format
without incorporating them into the Sphinx tree. The hope is to bring
some uniformity to kernel documentation and, perhaps more importantly,
have our existing docs serve as an example of the desired formatting
for those that will be added later.
Mauro has gone through and fixed up a lot of top-level documentation
files to make them conform to the RST format, but without moving or
renaming them in any way. This will help when we incorporate the ones
we want to keep into the Sphinx doctree, but the real purpose is to
bring a bit of uniformity to our documentation and let the top-level
docs serve as examples for those writing new ones"
* tag 'standardize-docs' of git://git.lwn.net/linux: (84 commits)
docs: kprobes.txt: Fix whitespacing
tee.txt: standardize document format
cgroup-v2.txt: standardize document format
dell_rbu.txt: standardize document format
zorro.txt: standardize document format
xz.txt: standardize document format
xillybus.txt: standardize document format
vfio.txt: standardize document format
vfio-mediated-device.txt: standardize document format
unaligned-memory-access.txt: standardize document format
this_cpu_ops.txt: standardize document format
svga.txt: standardize document format
static-keys.txt: standardize document format
smsc_ece1099.txt: standardize document format
SM501.txt: standardize document format
siphash.txt: standardize document format
sgi-ioc4.txt: standardize document format
SAK.txt: standardize document format
rpmsg.txt: standardize document format
robust-futexes.txt: standardize document format
...
Diffstat (limited to 'Documentation/robust-futex-ABI.txt')
-rw-r--r-- | Documentation/robust-futex-ABI.txt | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/Documentation/robust-futex-ABI.txt b/Documentation/robust-futex-ABI.txt index 16eb314f56cc..8a5d34abf726 100644 --- a/Documentation/robust-futex-ABI.txt +++ b/Documentation/robust-futex-ABI.txt @@ -1,7 +1,9 @@ -Started by Paul Jackson <pj@sgi.com> - +==================== The robust futex ABI --------------------- +==================== + +:Author: Started by Paul Jackson <pj@sgi.com> + 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, |