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| author | Mikael Ronstrom <mikael@mysql.com> | 2008-12-10 14:02:52 +0100 |
|---|---|---|
| committer | Mikael Ronstrom <mikael@mysql.com> | 2008-12-10 14:02:52 +0100 |
| commit | 8e2b83e73332e6d28af06a51a457e2d6b323620b (patch) | |
| tree | c534f41e5f21a97c83c4e7699f4cb734b690bbd5 /configure.in | |
| parent | abae8a2c9c969f98ef72b818e3147cf314fd284b (diff) | |
| download | mariadb-git-8e2b83e73332e6d28af06a51a457e2d6b323620b.tar.gz | |
Added a PAUSE instruction to the SPIN loop
according to recommendation from Intel.
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/configure.in b/configure.in index d7f250959d1..be6a4a33c65 100644 --- a/configure.in +++ b/configure.in @@ -2342,6 +2342,17 @@ fi fi #---END: +#Check for x86 PAUSE instruction +AC_MSG_CHECKING("for x86 PAUSE instruction") +AC_TRY_COMPILE( +[], +[{__asm__ __volatile__ ("pause");}], +x86_pause_exists=yes, x86_pause_exists=no) +if test "$x86_pause_exists" = "yes" +then + AC_DEFINE([HAVE_PAUSE_INSTRUCTION], [1], [Does x86 PAUSE instruction exist]) +fi + # Check if pthread_attr_setscope() exists AC_CACHE_CHECK("for pthread_attr_setscope", mysql_cv_pthread_attr_setscope, AC_TRY_LINK( |