Cleanups to the code that detects the amount of RAM and

the number of CPU cores. Added support for using sysinfo()
on Linux systems whose libc lacks appropriate sysconf()
support (at least dietlibc). The Autoconf macros were
split into separate files, and CPU core count detection
was moved from hardware.c to cpucores.h. The core count
isn't used for anything real for now, so a problematic
part in process.c was commented out.

2 files changed, 131 insertions, 0 deletions

diff --git a/m4/lc_cpucores.m4 b/m4/lc_cpucores.m4
new file mode 100644
index 0000000..5e4e02d
--- /dev/null
+++ b/m4/lc_cpucores.m4
@@ -0,0 +1,57 @@
+dnl ###########################################################################
+dnl
+dnl lc_CPUCORES - Check how to find out the number of online CPU cores
+dnl
+dnl Check how to find out the number of available CPU cores in the system.
+dnl sysconf(_SC_NPROCESSORS_ONLN) works on most systems, except that BSDs
+dnl use sysctl().
+dnl
+dnl ###########################################################################
+dnl
+dnl Author: Lasse Collin
+dnl
+dnl This file has been put into the public domain.
+dnl You can do whatever you want with this file.
+dnl
+dnl ###########################################################################
+AC_DEFUN([lc_CPUCORES], [
+AC_MSG_CHECKING([how to detect the number of available CPU cores])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+	long i;
+	i = sysconf(_SC_NPROCESSORS_ONLN);
+	return 0;
+}
+]])], [
+	AC_DEFINE([HAVE_NCPU_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_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, NULL);
+	return 0;
+}
+]])], [
+	AC_DEFINE([HAVE_NCPU_SYSCTL], [1],
+		[Define to 1 if the number of available CPU cores can be
+		detected with sysctl().])
+	AC_MSG_RESULT([sysctl])
+], [
+	AC_MSG_RESULT([unknown])
+])])
+])dnl lc_CPUCORES
diff --git a/m4/lc_physmem.m4 b/m4/lc_physmem.m4
new file mode 100644
index 0000000..8633f4a
--- /dev/null
+++ b/m4/lc_physmem.m4
@@ -0,0 +1,74 @@
+dnl ###########################################################################
+dnl
+dnl lc_PHYSMEM - Check how to find out the amount of physical memory
+dnl
+dnl - sysconf() gives all the needed info on GNU+Linux and Solaris.
+dnl - BSDs use sysctl().
+dnl - sysinfo() works on Linux/dietlibc and probably on other Linux systems
+dnl   whose libc may lack sysconf().
+dnl
+dnl ###########################################################################
+dnl
+dnl Author: Lasse Collin
+dnl
+dnl This file has been put into the public domain.
+dnl You can do whatever you want with this file.
+dnl
+dnl ###########################################################################
+AC_DEFUN([lc_PHYSMEM], [
+AC_MSG_CHECKING([how to detect the amount of physical memory])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int
+main(void)
+{
+	long i;
+	i = sysconf(_SC_PAGESIZE);
+	i = sysconf(_SC_PHYS_PAGES);
+	return 0;
+}
+]])], [
+	AC_DEFINE([HAVE_PHYSMEM_SYSCONF], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
+	AC_MSG_RESULT([sysconf])
+], [
+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_PHYSMEM };
+	unsigned long mem;
+	size_t mem_ptr_size = sizeof(mem);
+	sysctl(name, 2, &mem, &mem_ptr_size, NULL, NULL);
+	return 0;
+}
+]])], [
+	AC_DEFINE([HAVE_PHYSMEM_SYSCTL], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysctl().])
+	AC_MSG_RESULT([sysctl])
+], [
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
+#include <sys/sysinfo.h>
+int
+main(void)
+{
+	struct sysinfo si;
+	sysinfo(&si);
+	return 0;
+}
+]])], [
+	AC_DEFINE([HAVE_PHYSMEM_SYSINFO], [1],
+		[Define to 1 if the amount of physical memory can be detected
+		with sysinfo().])
+	AC_MSG_RESULT([sysinfo])
+], [
+	AC_MSG_RESULT([unknown])
+])])])
+])dnl lc_PHYSMEM