Write out to the backing store asynchronously.

Despite the fact AmigaOS filesystems run as separate processes,
DOS filesystem writes occur synchronously waiting for the disk
write to finish before returning.  Here we have effectively taken
the core's fs backing store and extended it slightly so the store
operation is spun off into a new process, running at a lower task
priority than NetSurf itself.  This stops the UI pauses that occur
shortly after loading pages as NetSurf commits the cache to disk.

Somewhat experimental, pending more extensive user testing.

5 files changed, 123 insertions, 7 deletions

diff --git a/amiga/Makefile.defaults b/amiga/Makefile.defaults
index 20022bb98..2134e8373 100644
--- a/amiga/Makefile.defaults
+++ b/amiga/Makefile.defaults
@@ -26,10 +26,6 @@ NETSURF_USE_AMIGA_DATATYPES := YES
 # Valid options: YES, NO
 NETSURF_USE_NSSVG := YES
 
-# Enable building the source object cache filesystem based backing store.
-# Valid options: YES, NO
-NETSURF_FS_BACKING_STORE := YES
-
 # Enable NetSurf's use of Spidermonkey 1.80+
 # Only here to stop the build complaining;
 # enable NETSURF_USE_MOZJS instead for JavaScript support
diff --git a/amiga/Makefile.target b/amiga/Makefile.target
index bb8b8173d..21a482d95 100644
--- a/amiga/Makefile.target
+++ b/amiga/Makefile.target
@@ -72,7 +72,7 @@ S_AMIGA := gui.c tree.c history.c hotlist.c schedule.c file.c		\
 	sslcert.c gui_options.c print.c	theme.c	drag.c icon.c libs.c	\
 	datatypes.c dt_picture.c dt_anim.c dt_sound.c plugin_hack.c	\
 	stringview/stringview.c stringview/urlhistory.c			\
-	agclass/amigaguide_class.c
+	agclass/amigaguide_class.c fs_backing_store.c
 S_AMIGA := $(addprefix amiga/,$(S_AMIGA))
 
 # This is the final source build list
diff --git a/amiga/fs_backing_store.c b/amiga/fs_backing_store.c
new file mode 100644
index 000000000..94ab6cc61
--- /dev/null
+++ b/amiga/fs_backing_store.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2014 Chris Young <chris@unsatisfactorysoftware.co.uk>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf 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.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <proto/dos.h>
+#include <proto/exec.h>
+
+#include "content/fs_backing_store.c"
+
+struct ami_backing_store_write {
+	nsurl *url;
+	enum backing_store_flags flags;
+	uint8_t *data;
+	size_t datalen;
+};
+
+
+static int32 ami_backing_store_write_process(STRPTR args, int32 length, APTR execbase)
+{
+	struct Process *proc = (struct Process *)FindTask(NULL);
+	struct ami_backing_store_write *absw = proc->pr_Task.tc_UserData;
+
+	filesystem_llcache_table->store(absw->url, absw->flags, absw->data, absw->datalen);
+	FreeVec(absw);
+
+	return RETURN_OK;
+}
+
+
+/**
+ * Place an object in the backing store.
+ * This implementation starts a new process and calls the core routine.
+ *
+ * @param url The url is used as the unique primary key for the data.
+ * @param flags The flags to control how the object is stored.
+ * @param data The objects source data.
+ * @param datalen The length of the \a data.
+ * @return NSERROR_OK on success or error code on faliure.
+ */
+static nserror
+ami_backing_store_store(nsurl *url,
+      enum backing_store_flags flags,
+      const uint8_t *data,
+      const size_t datalen)
+{
+	struct ami_backing_store_write *absw =
+		AllocVecTagList(sizeof(struct ami_backing_store_write), NULL);
+
+	if(absw == NULL) return NSERROR_NOMEM;
+
+	absw->url = url;
+	absw->flags = flags;
+	absw->data = (uint8_t *)data;
+	absw->datalen = datalen;
+
+	struct Process *proc = CreateNewProcTags(
+		NP_Name, "NetSurf backing store write process",
+		NP_Entry, ami_backing_store_write_process,
+		NP_Child, TRUE,
+		NP_StackSize, 16384,
+		NP_Priority, -1,
+		NP_UserData, absw,
+		TAG_DONE);
+
+	if(proc == NULL) {
+		FreeVec(absw);
+		return NSERROR_NOMEM;
+	}
+
+	return NSERROR_OK;
+}
+
+
+static struct gui_llcache_table amiga_llcache_table = {
+	.initialise = initialise,
+	.finalise = finalise,
+	.store = ami_backing_store_store,
+	.fetch = fetch,
+	.invalidate = invalidate,
+};
+
+struct gui_llcache_table *amiga_filesystem_llcache_table = &amiga_llcache_table;
+
diff --git a/amiga/fs_backing_store.h b/amiga/fs_backing_store.h
new file mode 100644
index 000000000..89a67fb79
--- /dev/null
+++ b/amiga/fs_backing_store.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2014 Chris Young <chris@unsatisfactorysoftware.co.uk>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf 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.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef AMIGA_FS_BACKING_STORE_H
+#define AMIGA_FS_BACKING_STORE_H
+extern struct gui_llcache_table *amiga_filesystem_llcache_table;
+#endif
+
diff --git a/amiga/gui.c b/amiga/gui.c
index e76a01e66..2419e23b8 100644
--- a/amiga/gui.c
+++ b/amiga/gui.c
@@ -93,7 +93,6 @@
 #include "utils/utils.h"
 #include "utils/nsurl.h"
 #include "utils/file.h"
-#include "content/backing_store.h"
 #include "content/fetchers.h"
 #include "content/fetchers/resource.h"
 #include "content/urldb.h"
@@ -126,6 +125,7 @@
 #include "amiga/file.h"
 #include "amiga/filetype.h"
 #include "amiga/font.h"
+#include "amiga/fs_backing_store.h"
 #include "amiga/gui_options.h"
 #include "amiga/help.h"
 #include "amiga/history.h"
@@ -5311,7 +5311,7 @@ int main(int argc, char** argv)
 		.utf8 = amiga_utf8_table,
 		.search = amiga_search_table,
 		.search_web = &amiga_search_web_table,
-		.llcache = filesystem_llcache_table,
+		.llcache = amiga_filesystem_llcache_table,
 	};
 
 	signal(SIGINT, SIG_IGN);