vbox: implement pthread_create specifically

Issue #1114

ports/src/virtualbox/target.mk

@@ -5,7 +5,7 @@ include $(REP_DIR)/lib/mk/virtualbox-common.inc
 TARGET = virtualbox
 SRC_CC = main.cc cxx_dummies.cc devices.cc drivers.cc dummies.cc libc.cc \
          logger.cc mm.cc pdm.cc pgm.cc rt.cc sup.cc iommio.cc ioport.cc \
-         hwaccm.cc
+         hwaccm.cc thread.cc 
 
 LIBS  += base
 LIBS  += config_args
@@ -16,6 +16,7 @@ LIBS  += virtualbox-bios virtualbox-recompiler virtualbox-runtime \
          virtualbox-hwaccl virtualbox-dis
 
 INC_DIR += $(call select_from_repositories,src/lib/libc)
+INC_DIR += $(call select_from_repositories,src/lib/pthread)
 
 INC_DIR += $(VBOX_DIR)/Runtime/include
 INC_DIR += $(VBOX_DIR)/Frontends/VBoxBFE

ports/src/virtualbox/thread.cc

@@ -0,0 +1,61 @@
+/*
+ * \brief  Virtualbox adjusted pthread_create implementation
+ * \author Alexander Boettcher
+ * \date   2014-04-09
+ */
+
+/*
+ * Copyright (C) 2014 Genode Labs GmbH
+ *
+ * This file is distributed under the terms of the GNU General Public License
+ * version 2.
+ */
+
+/* Genode */
+#include <base/printf.h>
+#include <base/thread.h>
+#include <base/env.h>
+
+/* Genode libc pthread binding */
+#include "thread.h"
+
+/* libc */
+#include <pthread.h>
+#include <errno.h>
+
+/* vbox */
+#include <internal/thread.h>
+
+extern "C" {
+
+	int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+	                   void *(*start_routine) (void *), void *arg)
+	{
+		PRTTHREADINT rtthread = reinterpret_cast<PRTTHREADINT>(arg);
+
+		Assert(rtthread);
+
+		size_t stack_size = Genode::Native_config::context_virtual_size() -
+		                    sizeof(Genode::Native_utcb) - 2 * (1UL << 12);
+
+		if (rtthread->cbStack < stack_size)
+			stack_size = rtthread->cbStack;
+		else
+			PWRN("requested stack for thread '%s' of %zu Bytes is too large, "
+			     "limit to %zu Bytes", rtthread->szName, rtthread->cbStack,
+			     stack_size);
+		
+		pthread_t thread_obj = new (Genode::env()->heap())
+		                           pthread(attr ? *attr : 0, start_routine,
+		                           arg, stack_size, rtthread->szName, nullptr);
+
+		if (!thread_obj)
+			return EAGAIN;
+
+		*thread = thread_obj;
+
+		thread_obj->start();
+
+		return 0;
+	}
+}