1 files changed, 106 insertions, 0 deletions

diff --git a/src/universe.cpp b/src/universe.cpp
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+++ b/src/universe.cpp
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+/*
+ * UNIVERSE.C                  Copyright (c) 2017, Benoit Germain
+ */
+
+/*
+===============================================================================
+
+Copyright (C) 2017 Benoit Germain <bnt.germain@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+===============================================================================
+*/
+
+#include <string.h>
+#include <assert.h>
+
+#include "universe.h"
+#include "compat.h"
+#include "macros_and_utils.h"
+#include "uniquekey.h"
+
+// xxh64 of string "UNIVERSE_FULL_REGKEY" generated at http://www.nitrxgen.net/hashgen/
+static constexpr UniqueKey UNIVERSE_FULL_REGKEY{ 0x99CA130C09EDC074ull };
+// xxh64 of string "UNIVERSE_LIGHT_REGKEY" generated at http://www.nitrxgen.net/hashgen/
+static constexpr UniqueKey UNIVERSE_LIGHT_REGKEY{ 0x3663C07C742CEB81ull };
+
+// ################################################################################################
+
+Universe::Universe()
+{
+    //---
+    // Linux needs SCHED_RR to change thread priorities, and that is only
+    // allowed for sudo'ers. SCHED_OTHER (default) has no priorities.
+    // SCHED_OTHER threads are always lower priority than SCHED_RR.
+    //
+    // ^-- those apply to 2.6 kernel.  IF **wishful thinking** these
+    //     constraints will change in the future, non-sudo priorities can
+    //     be enabled also for Linux.
+    //
+#ifdef PLATFORM_LINUX
+    // If lower priorities (-2..-1) are wanted, we need to lift the main
+    // thread to SCHED_RR and 50 (medium) level. Otherwise, we're always below
+    // the launched threads (even -2).
+    //
+#ifdef LINUX_SCHED_RR
+    if (m_sudo)
+    {
+        struct sched_param sp;
+        sp.sched_priority = _PRIO_0;
+        PT_CALL(pthread_setschedparam(pthread_self(), SCHED_RR, &sp));
+    }
+#endif // LINUX_SCHED_RR
+#endif // PLATFORM_LINUX
+}
+
+// ################################################################################################
+
+// only called from the master state
+Universe* universe_create(lua_State* L)
+{
+    ASSERT_L(universe_get(L) == nullptr);
+    Universe* const U = static_cast<Universe*>(lua_newuserdatauv(L, sizeof(Universe), 0));         // universe
+    U->Universe::Universe();
+    STACK_CHECK_START_REL(L, 1);
+    UNIVERSE_FULL_REGKEY.setValue(L, [](lua_State* L) { lua_pushvalue(L, -2); });
+    UNIVERSE_LIGHT_REGKEY.setValue(L, [U](lua_State* L) { lua_pushlightuserdata(L, U); });
+    STACK_CHECK(L, 1);
+    return U;
+}
+
+// ################################################################################################
+
+void universe_store(lua_State* L, Universe* U)
+{
+    ASSERT_L(!U || universe_get(L) == nullptr);
+    STACK_CHECK_START_REL(L, 0);
+    UNIVERSE_LIGHT_REGKEY.setValue(L, [U](lua_State* L) { U ? lua_pushlightuserdata(L, U) : lua_pushnil(L); });
+    STACK_CHECK(L, 0);
+}
+
+// ################################################################################################
+
+Universe* universe_get(lua_State* L)
+{
+    STACK_CHECK_START_REL(L, 0);
+    Universe* const universe{ UNIVERSE_LIGHT_REGKEY.readLightUserDataValue<Universe>(L) };
+    STACK_CHECK(L, 0);
+    return universe;
+}