Merge branch 'feature/fix-posix_memalign-usage' into 'master'

The point of the matter is that posix_memalign() is not allowed in this
context according to the relevant standards, so we use mmap() instad.

`mprotect` can only be used for `mmap`'ed memory

Makes testdebugallocator pass on OS X, too.

See merge request !43

dune/common/debugallocator.cc

@@ -15,7 +15,7 @@ namespace Dune
   namespace DebugMemory
   {
     // system constant for page size
-    const std::ptrdiff_t page_size = getpagesize();
+    const std::ptrdiff_t page_size = sysconf(_SC_PAGESIZE);
 
     // implement member functions
     void AllocationManager::allocation_error(const char* msg)

dune/common/debugallocator.hh

@@ -106,7 +106,7 @@ namespace Dune
             it->capacity << " bytes at " << it->ptr << std::endl;
             error = true;
           }
-          free(it->page_ptr);
+          munmap(it->page_ptr, it->pages * page_size);
         }
         if (error)
           allocation_error("lost allocations");
@@ -122,8 +122,10 @@ namespace Dune
         ai.pages = (ai.capacity) / page_size + 2;
         ai.not_free = true;
         size_type overlap = ai.capacity % page_size;
-        int result = posix_memalign(&(ai.page_ptr), page_size, ai.pages * page_size);
-        if (0 != result)
+        ai.page_ptr = mmap(NULL, ai.pages * page_size,
+                           PROT_READ | PROT_WRITE,
+                           MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+        if (MAP_FAILED == ai.page_ptr)
         {
           throw std::bad_alloc();
         }
@@ -171,7 +173,7 @@ namespace Dune
             memprotect(it->page_ptr,
                        (it->pages) * page_size,
                        PROT_READ | PROT_WRITE);
-            std::free(it->page_ptr);
+            munmap(it->page_ptr, it->pages * page_size);
             // remove chunk info
             allocation_list.erase(it);
 #endif

dune/common/test/CMakeLists.txt

@@ -116,7 +116,7 @@ dune_add_test(SOURCES testdebugallocator.cc
 dune_add_test(NAME testdebugallocator_fail1
               SOURCES testdebugallocator.cc
               LINK_LIBRARIES dunecommon
-              COMPILE_DEFINITIONS "FAILURE1;EXPECTED_SIGNAL=SIGSEGV"
+              COMPILE_DEFINITIONS "FAILURE1;EXPECTED_SIGNAL=SIGSEGV;EXPECTED_ALT_SIGNAL=SIGBUS"
               EXPECT_FAIL)
 
 dune_add_test(NAME testdebugallocator_fail2
@@ -134,13 +134,13 @@ dune_add_test(NAME testdebugallocator_fail3
 dune_add_test(NAME testdebugallocator_fail4
               SOURCES testdebugallocator.cc
               LINK_LIBRARIES dunecommon
-              COMPILE_DEFINITIONS "FAILURE4;DEBUG_ALLOCATOR_KEEP=1;EXPECTED_SIGNAL=SIGSEGV"
+              COMPILE_DEFINITIONS "FAILURE4;DEBUG_ALLOCATOR_KEEP=1;EXPECTED_SIGNAL=SIGSEGV;EXPECTED_ALT_SIGNAL=SIGBUS"
               EXPECT_FAIL)
 
 dune_add_test(NAME testdebugallocator_fail5
               SOURCES testdebugallocator.cc
               LINK_LIBRARIES dunecommon
-              COMPILE_DEFINITIONS "FAILURE5;EXPECTED_SIGNAL=SIGSEGV"
+              COMPILE_DEFINITIONS "FAILURE5;EXPECTED_SIGNAL=SIGSEGV;EXPECTED_ALT_SIGNAL=SIGBUS"
               EXPECT_FAIL)
 
 dune_add_test(SOURCES testfloatcmp.cc)

dune/common/test/testdebugallocator.cc

@@ -93,9 +93,16 @@ int main(int, char**)
 #if EXPECTED_SIGNAL
   std::signal(EXPECTED_SIGNAL, std::_Exit);
 #endif
+#if EXPECTED_ALT_SIGNAL
+  std::signal(EXPECTED_ALT_SIGNAL, std::_Exit);
+#endif
 
   basic_tests();
   allocator_tests();
   new_delete_tests();
+#ifdef EXPECTED_SIGNAL
+  return 1;
+#else
   return 0;
+#endif
 }