sheet extension and index cleanup

fix possible race condition w uibuff->index_started
on extension build, rebuild libzsvutil if stale
to do: consolidate index.c and transformation.c
       remove index.h from external api
       review writer.c for performance

app/Makefile

@@ -316,7 +316,6 @@ uninstall:
 	rm -rf ${ZSV}
 
 ZSV_UTIL_A=${LIBDIR}/libzsvutil.a
-
 ${ZSV_UTIL_A}:SQLITE_EXT=
 ${ZSV_UTIL_A}:SQLITE_EXT_INCLUDE=
 ${ZSV_UTIL_A}: ${BUILD_DIR}/objs/utils/util.a

app/ext_example/Makefile

@@ -221,4 +221,4 @@ ${TARGET} ${TARGET_SHEET}: ${BUILD_DIR}/bin/zsvext%.${SO} : %_extension.c ${LIBZ
 	@mkdir -p `dirname "$@"`
 	${CC} ${CFLAGS} ${CFLAGS_SHARED} $< -o $@ ${LIBS} ${YAJL_INCLUDE} ${YAJL_HELPER_INCLUDE}
 
-.PHONY: all test test-% clean install
+.PHONY: all test test-% clean install ${PREFIX}/lib/libzsvutil.a

app/sheet/read-data.c

@@ -207,6 +207,8 @@ static int read_data(struct zsvsheet_ui_buffer **uibufferp,   // a new zsvsheet_
   pthread_mutex_lock(&uibuff->mutex);
   char need_index = !uibuff->index_started && !uibuff->write_in_progress;
   char *old_ui_status = uibuff->status;
+  if(need_index)
+    uibuff->index_started = 1;
   pthread_mutex_unlock(&uibuff->mutex);
 
   if (need_index) {
@@ -215,7 +217,6 @@ static int read_data(struct zsvsheet_ui_buffer **uibufferp,   // a new zsvsheet_
 
     uibuff->buff_used_rows = rows_read;
     uibuff->dimensions.row_count = rows_read;
-    uibuff->index_started = 1;
     if (original_row_num > 1 && rows_read > 0) {
       opts.stream = NULL;
       get_data_index_async(uibuff, filename, &opts, custom_prop_handler, old_ui_status);