1 files changed, 58 insertions, 0 deletions
diff --git a/util/thread-utils.c b/util/thread-utils.c
new file mode 100644
index 000000000..e5ec6a843
--- /dev/null
+++ b/util/thread-utils.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "common.h"
+#include "thread-utils.h"
+
+#ifdef _WIN32
+#ifndef WIN32_LEAN_AND_MEAN
+#	define WIN32_LEAN_AND_MEAN
+#endif
+#	include <windows.h>
+#elif defined(hpux) || defined(__hpux) || defined(_hpux)
+#	include <sys/pstat.h>
+#endif
+
+/*
+ * By doing this in two steps we can at least get
+ * the function to be somewhat coherent, even
+ * with this disgusting nest of #ifdefs.
+ */
+#ifndef _SC_NPROCESSORS_ONLN
+#	ifdef _SC_NPROC_ONLN
+#		define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
+#	elif defined _SC_CRAY_NCPU
+#		define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
+#	endif
+#endif
+
+int git_online_cpus(void)
+{
+#ifdef _SC_NPROCESSORS_ONLN
+	long ncpus;
+#endif
+
+#ifdef _WIN32
+	SYSTEM_INFO info;
+	GetSystemInfo(&info);
+
+	if ((int)info.dwNumberOfProcessors > 0)
+		return (int)info.dwNumberOfProcessors;
+#elif defined(hpux) || defined(__hpux) || defined(_hpux)
+	struct pst_dynamic psd;
+
+	if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
+		return (int)psd.psd_proc_cnt;
+#endif
+
+#ifdef _SC_NPROCESSORS_ONLN
+	if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
+		return (int)ncpus;
+#endif
+
+	return 1;
+}