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| author | pluknet <pluknet@FreeBSD.org> | 2014-09-26 04:33:27 +0000 |
|---|---|---|
| committer | pluknet <pluknet@FreeBSD.org> | 2014-09-26 04:33:27 +0000 |
| commit | f0e5f3d683f5f84b8732becc468828e23f59d837 (patch) | |
| tree | a4673ed00be84ecdcf02d164bb14830ada06e7fa /lib | |
| parent | 7165803bdb14ecb429fc730ee2dee9ff3d164e13 (diff) | |
| download | FreeBSD-src-f0e5f3d683f5f84b8732becc468828e23f59d837.zip FreeBSD-src-f0e5f3d683f5f84b8732becc468828e23f59d837.tar.gz | |
Fix description of mutex acquisition.
Reviewed by: kib
X-MFC with: r272070
Sponsored by: Nginx, Inc.
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libthr/libthr.3 | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/libthr/libthr.3 b/lib/libthr/libthr.3 index a5b75d4..4b636ce 100644 --- a/lib/libthr/libthr.3 +++ b/lib/libthr/libthr.3 @@ -29,7 +29,7 @@ .\" .\" $FreeBSD$ .\" -.Dd September 20, 2014 +.Dd September 26, 2014 .Dt LIBTHR 3 .Os .Sh NAME @@ -85,8 +85,14 @@ owning the lock. .Nm performs a contested mutex acquisition in three stages, each of which is more resource-consuming than the previous. +The first two stages are only applied for a mutex of +.Dv PTHREAD_MUTEX_ADAPTIVE_NP +type and +.Dv PTHREAD_PRIO_NONE +protocol (see +.Xr pthread_mutexattr 3 ) . .Pp -First, a spin loop +First, on SMP systems, a spin loop is performed, where the library attempts to acquire the lock by .Xr atomic 9 operations. |
