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futex.2: clarify address mapping 

Using the word "physical" address should make the text easier to
make.

Avoid negations like "may not be equal".

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Heinrich Schuchardt 2015-03-29 20:38:13 +02:00 committed by Michael Kerrisk
parent 594536fb2c
commit 344df36631
1 changed files with 4 additions and 6 deletions
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10
man2/futex.2
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@ -54,12 +54,10 @@ The condition is represented by the futex word, which is an address
in memory supplied to the
.BR futex ()
system call, and the value at this memory location.
(While the virtual addresses for the same memory in separate
processes may not be equal,
the kernel maps them internally so that the same memory mapped
in different locations will correspond for
.BR futex ()
calls.)
(While the virtual addresses for the same physical memory address
in separate processes may be different,
the same physical address may be shared by the processes using
.BR mmap (2).)
When executing a futex operation that requests to block a thread,
the kernel will only block if the futex word has the value that the