diff options
Diffstat (limited to 'src/utils/storage.cc')
| -rw-r--r-- | src/utils/storage.cc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/utils/storage.cc b/src/utils/storage.cc index 4db7f302..4883de6c 100644 --- a/src/utils/storage.cc +++ b/src/utils/storage.cc @@ -29,6 +29,8 @@ // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// --%: Gabriel Dos Reis. + #include "openaxiom-c-macros.h" #ifdef HAVE_SYS_TYPES_H @@ -53,6 +55,7 @@ #include <errno.h> #include <stdlib.h> #include <string.h> +#include <new> // for placement new. #include "storage.H" namespace OpenAxiom { @@ -124,6 +127,40 @@ namespace OpenAxiom { #endif } + // ------------- + // -- Storage -- + // ------------- + Storage* + Storage::acquire(size_t alignment, size_t byte_count) { + // Adjust for overhead, and page boundary. + byte_count = round_up(byte_count + sizeof(Storage), page_size()); + Storage* mem = new(os_acquire_raw_memory(byte_count)) Storage; + mem->limit_top = mem->base() + round_up(sizeof(Storage), alignment); + mem->limit_bot = mem->base() + byte_count; + mem->free = mem->limit_top; + return mem; + } + + void + Storage::release(Storage* store) { + os_release_raw_memory(store, store->extent()); + } + + bool + Storage::align_to(size_t alignment) { + if (alignment == 0) // protect against nuts + return true; + if (alignment == 1) // no preferred alignment at all + return true; + Byte* b = base(); + const size_t offset = round_up(free - b, alignment); + if (offset < size_t(limit_bot - b)) { + free = b + offset; + return true; + } + return false; // not enough room left + } + // ----------------- // -- FileMapping -- // ----------------- |