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authorLasse Collin <lasse.collin@tukaani.org>2009-09-19 09:47:30 +0300
committerLasse Collin <lasse.collin@tukaani.org>2009-09-19 09:47:30 +0300
commite599bba4216c0edb8cc8f40adad3a6dba88685f4 (patch)
treed52c699f599e276ff65302e5854a26998da1a928 /m4/tuklib_cpucores.m4
parentFix incorrect use of "restrict". (diff)
downloadxz-e599bba4216c0edb8cc8f40adad3a6dba88685f4.tar.xz
Various changes.
Separate a few reusable components from XZ Utils specific code. The reusable code is now in "tuklib" modules. A few more could be separated still, e.g. bswap.h. Fix some bugs in lzmainfo. Fix physmem and cpucores code on OS/2. Thanks to Elbert Pol for help. Add OpenVMS support into physmem. Add a few #ifdefs to ease building XZ Utils on OpenVMS. Thanks to Jouk Jansen for the original patch.
Diffstat (limited to 'm4/tuklib_cpucores.m4')
-rw-r--r--m4/tuklib_cpucores.m472
1 files changed, 72 insertions, 0 deletions
diff --git a/m4/tuklib_cpucores.m4 b/m4/tuklib_cpucores.m4
new file mode 100644
index 00000000..9058d445
--- /dev/null
+++ b/m4/tuklib_cpucores.m4
@@ -0,0 +1,72 @@
+#
+# SYNOPSIS
+#
+# TUKLIB_CPUCORES
+#
+# DESCRIPTION
+#
+# Check how to find out the number of available CPU cores in the system.
+# This information is used by tuklib_cpucores.c.
+#
+# Currently this supports sysctl() (BSDs, OS/2) and sysconf() (GNU/Linux,
+# Solaris, Cygwin).
+#
+# COPYING
+#
+# Author: Lasse Collin
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+
+AC_DEFUN_ONCE([TUKLIB_CPUCORES], [
+AC_REQUIRE([TUKLIB_COMMON])
+
+# sys/param.h might be needed by sys/sysctl.h.
+AC_CHECK_HEADERS([sys/param.h])
+
+AC_MSG_CHECKING([how to detect the number of available CPU cores])
+
+# Look for sysctl() solution first, because on OS/2, both sysconf()
+# and sysctl() pass the tests in this file, but only sysctl()
+# actually works.
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/types.h>
+#ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+#include <sys/sysctl.h>
+int
+main(void)
+{
+ int name[2] = { CTL_HW, HW_NCPU };
+ int cpus;
+ size_t cpus_size = sizeof(cpus);
+ sysctl(name, 2, &cpus, &cpus_size, NULL, 0);
+ return 0;
+}
+]])], [
+ AC_DEFINE([TUKLIB_CPUCORES_SYSCTL], [1],
+ [Define to 1 if the number of available CPU cores can be
+ detected with sysctl().])
+ AC_MSG_RESULT([sysctl])
+], [
+
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+ long i;
+ i = sysconf(_SC_NPROCESSORS_ONLN);
+ return 0;
+}
+]])], [
+ AC_DEFINE([TUKLIB_CPUCORES_SYSCONF], [1],
+ [Define to 1 if the number of available CPU cores can be
+ detected with sysconf(_SC_NPROCESSORS_ONLN).])
+ AC_MSG_RESULT([sysconf])
+], [
+ AC_MSG_RESULT([unknown])
+])])
+])dnl