Factor out the mmap window code

This code is useful for more things than just the packfile handling
code. Factor it out so it can be reused.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/mwindow.h b/src/mwindow.h
new file mode 100644
index 000000000..971d1eee8
--- /dev/null
+++ b/src/mwindow.h
@@ -0,0 +1,64 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDE_mwindow__
+#define INCLUDE_mwindow__
+
+#include "map.h"
+#include "vector.h"
+#include "fileops.h"
+
+typedef struct git_mwindow {
+	struct git_mwindow *next;
+	git_map window_map;
+	off_t offset;
+	unsigned int last_used;
+	unsigned int inuse_cnt;
+} git_mwindow;
+
+typedef struct git_mwindow_file {
+	git_mwindow *windows;
+} git_mwindow_file;
+
+typedef struct git_mwindow_ctl {
+	size_t mapped;
+	unsigned int open_windows;
+	size_t window_size; /* needs default value */
+	size_t mapped_limit; /* needs default value */
+	unsigned int mmap_calls;
+	unsigned int peak_open_windows;
+	size_t peak_mapped;
+	size_t used_ctr;
+	git_vector windowfiles;
+} git_mwindow_ctl;
+
+int git_mwindow_contains(git_mwindow *win, off_t offset);
+void git_mwindow_free_all(git_mwindow_file *mwf);
+unsigned char *git_mwindow_open(git_mwindow_file *mwf, git_mwindow **cursor, git_file fd, size_t size, off_t offset, int extra, unsigned int *left);
+void git_mwindow_scan_lru(git_mwindow_file *mwf, git_mwindow **lru_w, git_mwindow **lru_l);
+int git_mwindow_file_register(git_mwindow_file *mwf);
+void git_mwindow_close(git_mwindow **w_cursor);
+
+#endif