fix bug where settings_pack::file_pool_size setting was not being honored

ChangeLog

@@ -1,3 +1,4 @@
+	* fix bug where settings_pack::file_pool_size setting was not being honored
 	* add feature to periodically close files (to make windows clear disk cache)
 	* fix bug in torrent_handle::file_status
 	* fix issue with peers not updated on metadata from magnet links

include/libtorrent/settings_pack.hpp

@@ -786,9 +786,7 @@ namespace libtorrent
 			// for viruses. deferring the closing of the files will be the
 			// difference between a usable system and a completely hogged down
 			// system. Most operating systems also has a limit on the total number
-			// of file descriptors a process may have open. It is usually a good
-			// idea to find this limit and set the number of connections and the
-			// number of files limits so their sum is slightly below it.
+			// of file descriptors a process may have open.
 			file_pool_size,
 
 			// ``max_failcount`` is the maximum times we try to connect to a peer

simulation/test_file_pool.cpp

@@ -38,6 +38,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "libtorrent/session.hpp"
 #include "libtorrent/session_stats.hpp"
 #include "libtorrent/file.hpp"
+#include "libtorrent/torrent_info.hpp"
 
 using namespace libtorrent;
 
@@ -84,3 +85,55 @@ TORRENT_TEST(close_file_interval)
 	TEST_CHECK(ran_to_completion);
 }
 
+TORRENT_TEST(file_pool_size)
+{
+	bool ran_to_completion = false;
+	int max_files = 0;
+
+	setup_swarm(2, swarm_test::download
+		// add session
+		, [](lt::settings_pack& pack)
+		{
+			pack.set_int(lt::settings_pack::file_pool_size, 5);
+		}
+		// add torrent
+		, [](lt::add_torrent_params& atp) {
+			// we need a torrent with lots of files in it, to hit the
+			// file_size_limit we set.
+			file_storage fs;
+			for (int i = 0; i < 0x10 * 9; ++i)
+			{
+				char filename[50];
+				snprintf(filename, sizeof(filename), "root/file-%d", i);
+				fs.add_file(filename, 0x400);
+			}
+			atp.ti = boost::make_shared<torrent_info>(*atp.ti);
+			atp.ti->remap_files(fs);
+		}
+		// on alert
+		, [&](lt::alert const* a, lt::session&)
+		{}
+		// terminate
+		, [&](int ticks, lt::session& ses) -> bool
+		{
+			if (ticks > 80)
+			{
+				TEST_ERROR("timeout");
+				return true;
+			}
+
+			std::vector<pool_file_status> status;
+			ses.get_torrents().at(0).file_status(status);
+			printf("open files: %d\n", int(status.size()));
+			max_files = std::max(max_files, int(status.size()));
+			if (!is_seed(ses)) return false;
+			printf("completed in %d ticks\n", ticks);
+			ran_to_completion = true;
+			return true;
+		});
+
+	TEST_CHECK(max_files <= 5);
+	TEST_CHECK(max_files >= 4);
+	TEST_CHECK(ran_to_completion);
+}
+

src/disk_io_thread.cpp

@@ -57,10 +57,6 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "libtorrent/debug.hpp"
 
-#if TORRENT_USE_RLIMIT
-#include <sys/resource.h>
-#endif
-
 #define DEBUG_DISK_THREAD 0
 
 #if __cplusplus >= 201103L || defined __clang__
@@ -172,7 +168,7 @@ namespace libtorrent
 		// futexes, shared objects etc.
 		// 80% of the available file descriptors should go to connections
 		// 20% goes towards regular files
-		const int max_files = (std::min)((std::max)(5
+		const int max_files = std::min((std::max)(5
 				, (max_open_files() - 20) * 2 / 10)
 			, m_file_pool.size_limit());
 		m_file_pool.resize(max_files);
@@ -282,6 +278,7 @@ namespace libtorrent
 		apply_pack(pack, m_settings);
 		error_code ec;
 		m_disk_cache.set_settings(m_settings, ec);
+		m_file_pool.resize(m_settings.get_int(settings_pack::file_pool_size));
 #ifndef TORRENT_NO_DEPRECATE
 		if (ec && alerts.should_post<mmap_cache_alert>())
 		{

src/session_impl.cpp

@@ -57,24 +57,6 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <valgrind/memcheck.h>
 #endif
 
-#if TORRENT_USE_RLIMIT
-
-#ifdef __GNUC__
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wlong-long"
-#endif // __GNUC__
-
-#include <sys/resource.h>
-
-// capture this here where warnings are disabled (the macro generates warnings)
-const rlim_t rlim_infinity = RLIM_INFINITY;
-
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif // __GNUC__
-
-#endif // TORRENT_USE_RLIMIT
-
 #include "libtorrent/aux_/disable_warnings_pop.hpp"
 
 #include "libtorrent/aux_/openssl.hpp"