land libtorrent_aio branch in trunk

src/platform_util.cpp

@@ -0,0 +1,100 @@
+/*
+
+Copyright (c) 2012-2013, Arvid Norberg
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in
+      the documentation and/or other materials provided with the distribution.
+    * Neither the name of the author nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 "libtorrent/config.hpp"
+#include <boost/cstdint.hpp>
+
+#if TORRENT_USE_RLIMIT
+#include <sys/resource.h>
+#endif
+
+#ifdef TORRENT_BSD
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
+#if defined TORRENT_WINDOWS
+#include <windows.h>
+#endif
+
+namespace libtorrent
+{
+
+	boost::uint64_t total_physical_ram()
+	{
+		// figure out how much physical RAM there is in
+		// this machine. This is used for automatically
+		// sizing the disk cache size when it's set to
+		// automatic.
+		boost::uint64_t ret = 0;
+	
+#ifdef TORRENT_BSD
+#ifdef HW_MEMSIZE
+		int mib[2] = { CTL_HW, HW_MEMSIZE };
+#else
+		// not entirely sure this sysctl supports 64
+		// bit return values, but it's probably better
+		// than not building
+		int mib[2] = { CTL_HW, HW_PHYSMEM };
+#endif
+		size_t len = sizeof(ret);
+		if (sysctl(mib, 2, &ret, &len, NULL, 0) != 0)
+			ret = 0;
+#elif defined TORRENT_WINDOWS
+		MEMORYSTATUSEX ms;
+		ms.dwLength = sizeof(MEMORYSTATUSEX);
+		if (GlobalMemoryStatusEx(&ms))
+			ret = ms.ullTotalPhys;
+		else
+			ret = 0;
+#elif defined TORRENT_LINUX
+		ret = sysconf(_SC_PHYS_PAGES);
+		ret *= sysconf(_SC_PAGESIZE);
+#elif defined TORRENT_AMIGA
+		ret = AvailMem(MEMF_PUBLIC);
+#endif
+
+#if TORRENT_USE_RLIMIT
+		if (ret > 0)
+		{
+			struct rlimit r;
+			if (getrlimit(RLIMIT_AS, &r) == 0 && r.rlim_cur != RLIM_INFINITY)
+			{
+				if (ret > r.rlim_cur)
+					ret = r.rlim_cur;
+			}
+		}
+#endif
+		return ret;
+	}
+}
+