d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Catch up to WAIT/NOWAIT cleanup.

Browse Source
This commit is contained in:
Alfred Perlstein 2003-01-21 08:57:35 +00:00
parent 44956c9863
commit 2a62ffb72d
2 changed files with 3 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
share/man/man9/malloc.9
View File

@ -154,27 +154,8 @@ will return
.Dv NULL
rather than block.
Note that
.Dv M_WAITOK
is defined to be 0, meaning that blocking operation is the default.
Also note that
.Dv M_NOWAIT
is required when running in an interrupt context.
.Pp
Programmers should be careful not to confuse
.Dv M_NOWAIT ,
the
.Fn malloc
flag, with
.Dv M_DONTWAIT ,
an
.Xr mbuf 9
allocation flag, which is not a valid argument to
.Fn malloc .
.It Dv M_WAITOK
Indicates that it is Ok to wait for resources. It is unconveniently
defined as 0 so care should be taken never to compare against this value
directly or try to AND it as a flag. The default operation is to block
until the memory allocation succeeds.
.Fn malloc ,
.Fn realloc ,
and

14
share/man/man9/mbuf.9
View File

@ -278,14 +278,14 @@ on failure.
The
.Fa how
argument is to be set to
.Dv M_TRYWAIT
.Dv 0
or
.Dv M_DONTWAIT .
.Dv M_NOWAIT .
It specifies whether the caller is willing to block if necessary.
If
.Fa how
is set to
.Dv M_TRYWAIT ,
.Dv 0 ,
a failed allocation will result in the caller being put
to sleep for a designated
kern.ipc.mbuf_wait
@ -295,14 +295,6 @@ number of ticks.
A number of other mbuf-related
functions and macros have the same argument because they may
at some point need to allocate new mbufs.
.Pp
Programmers should be careful not to confuse the mbuf allocation flag
.Dv M_DONTWAIT
with the
.Xr malloc 9
allocation flag,
.Dv M_NOWAIT .
They are not the same.
.It Fn MGETHDR mbuf how type
Allocate an mbuf and initialize it to contain a packet header
and internal data.