1 files changed, 72 insertions, 0 deletions
diff --git a/src/libmowgli/platform/cacheline.c b/src/libmowgli/platform/cacheline.c
new file mode 100644
index 0000000..90c803f
--- /dev/null
+++ b/src/libmowgli/platform/cacheline.c
@@ -0,0 +1,72 @@
+/*
+ * libmowgli: A collection of useful routines for programming.
+ * cacheline.c: Platform specific routines to get L1 cache line size
+ *
+ * Copyright (c) 2013 Patrick McFarland <pmcfarland@adterrasperaspera.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "mowgli.h"
+
+#ifdef MOWGLI_OS_OSX
+# include <sys/sysctl.h>
+#endif
+
+size_t cacheline_size;
+
+void
+mowgli_cacheline_bootstrap(void)
+{
+#ifdef MOWGLI_OS_LINUX
+	cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
+#elif defined(MOWGLI_OS_OSX)
+	size_t size = sizeof(size_t);
+	sysctlbyname("hw.cachelinesize", &cacheline_size, &size, 0, 0);
+#elif defined(MOWGLI_OS_WIN)
+	DWORD buf_size = 0;
+	DWORD i = 0;
+	SYSTEM_LOGICAL_PROCESSOR_INFORMATION *buf = 0;
+
+	GetLogicalProcessorInformation(0, &buf_size);
+	buf = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION *) mowgli_alloc(buf_size);
+	GetLogicalProcessorInformation(&buf[0], &buf_size);
+
+	for (i = 0; i != buf_size / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ++i)
+		if ((buf[i].Relationship == RelationCache) && (buf[i].Cache.Level == 1))
+		{
+			cacheline_size = buf[i].Cache.LineSize;
+			break;
+		}
+
+	mowgli_free(buf);
+#else
+
+	// This is often true
+# ifdef MOWGLI_CPU_BITS_32
+	cacheline_size = 32;
+# else
+	cacheline_size = 64;
+# endif
+#endif
+}
+
+size_t
+mowgli_cacheline_size(void)
+{
+	return cacheline_size;
+}