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membarrier.2: ffix 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2018-04-12 13:27:19 +02:00
parent e8edc8917c
commit d8b2fd50e1
1 changed files with 6 additions and 0 deletions
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6
man2/membarrier.2
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@ -92,6 +92,7 @@ All threads on the system are targeted by this command.
Execute a memory barrier on all running threads of all processes that
previously registered with
.BR MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED .
.IP
Upon return from the system call, the calling thread has a guarantee that all
running threads have passed through a state where all memory accesses to
user-space addresses match program order between entry to and return
@ -99,6 +100,7 @@ from the system call (non-running threads are de facto in such a state).
This guarantee is provided only for the threads of processes that
previously registered with
.BR MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED .
.IP
Given that registration is about the intent to receive the barriers, it
is valid to invoke
.BR MEMBARRIER_CMD_GLOBAL_EXPEDITED
@ -116,6 +118,7 @@ memory barriers.
.BR MEMBARRIER_CMD_PRIVATE_EXPEDITED " (since Linux 4.14)"
Execute a memory barrier on each running thread belonging to the same
process as the calling thread.
.IP
Upon return from the system call, the calling
thread has a guarantee that all its running thread siblings have passed
through a state where all memory accesses to user-space addresses match
@ -126,6 +129,7 @@ the same process as the calling thread.
.IP
The "expedited" commands complete faster than the non-expedited ones;
they never block, but have the downside of causing extra overhead.
.IP
A process must register its intent to use the private
expedited command prior to using it.
.TP
@ -140,8 +144,10 @@ upon return from system call the calling thread has a guarantee that all its
running thread siblings have executed a core serializing instruction.
This guarantee is provided only for threads in
the same process as the calling thread.
.IP
The "expedited" commands complete faster than the non-expedited ones,
they never block, but have the downside of causing extra overhead.
.IP
A process must register its intent to use the private expedited sync
core command prior to using it.
.TP