Index: libcfa/src/concurrency/coroutine.cfa
===================================================================
--- libcfa/src/concurrency/coroutine.cfa	(revision 97229d6d4d0603b4f97fac22b55c583eb89341e1)
+++ libcfa/src/concurrency/coroutine.cfa	(revision dd92fe99b48e772fd64dd9ca1fcbf9c8f552133a)
@@ -10,6 +10,6 @@
 // Created On       : Mon Nov 28 12:27:26 2016
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Fri Oct 23 23:05:24 2020
-// Update Count     : 22
+// Last Modified On : Tue Dec 15 12:06:04 2020
+// Update Count     : 23
 //
 
@@ -88,4 +88,5 @@
 static const size_t MinStackSize = 1000;
 extern size_t __page_size;				// architecture pagesize HACK, should go in proper runtime singleton
+extern int __map_prot;
 
 void __stack_prepare( __stack_info_t * this, size_t create_size );
@@ -206,5 +207,5 @@
 		__cfaabi_dbg_debug_do(
 			storage = (char*)(storage) - __page_size;
-			if ( mprotect( storage, __page_size, PROT_READ | PROT_WRITE ) == -1 ) {
+			if ( mprotect( storage, __page_size, __map_prot ) == -1 ) {
 				abort( "(coStack_t *)%p.^?{}() : internal error, mprotect failure, error(%d) %s.", &this, errno, strerror( errno ) );
 			}
Index: libcfa/src/concurrency/kernel/startup.cfa
===================================================================
--- libcfa/src/concurrency/kernel/startup.cfa	(revision 97229d6d4d0603b4f97fac22b55c583eb89341e1)
+++ libcfa/src/concurrency/kernel/startup.cfa	(revision dd92fe99b48e772fd64dd9ca1fcbf9c8f552133a)
@@ -117,5 +117,5 @@
 }
 
-size_t __page_size = 0;
+extern size_t __page_size;
 
 //-----------------------------------------------------------------------------
@@ -161,6 +161,4 @@
 	/* paranoid */ verify( ! __preemption_enabled() );
 	__cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
-
-	__page_size = sysconf( _SC_PAGESIZE );
 
 	__cfa_dbg_global_clusters.list{ __get };
@@ -681,5 +679,5 @@
 	#if CFA_PROCESSOR_USE_MMAP
 		stacksize = ceiling( stacksize, __page_size ) + __page_size;
-		stack = mmap(0p, stacksize, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+		stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
 		if(stack == ((void*)-1)) {
 			abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );