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-rw-r--r--src/H5Cpkg.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/H5Cpkg.h b/src/H5Cpkg.h
index 3ea5144..321f1fb 100644
--- a/src/H5Cpkg.h
+++ b/src/H5Cpkg.h
@@ -4104,6 +4104,23 @@ typedef struct H5C_tag_info_t {
* of changes to the file driver info superblock extension
* management code needed to support rings.
*
+ * msic_in_progress: As the metadata cache has become re-entrant, and as
+ * the free space manager code has become more tightly
+ * integrated with the metadata cache, it is possible that
+ * a call to H5C_insert_entry() may trigger a call to
+ * H5C_make_space_in_cache(), which, via H5C__flush_single_entry()
+ * and client callbacks, may trigger an infinite regression
+ * of calls to H5C_make_space_in_cache().
+ *
+ * The msic_in_progress boolean flag is used to detect this,
+ * and prevent the infinite regression that would otherwise
+ * occur.
+ *
+ * Note that this is issue is not hypothetical -- this field
+ * was added 2/16/17 to address this issue when it was
+ * exposed by modifications to test/fheap.c to cause it to
+ * use paged allocation.
+ *
* resize_ctl: Instance of H5C_auto_size_ctl_t containing configuration
* data for automatic cache resizing.
*
@@ -4743,6 +4760,7 @@ struct H5C_t {
hbool_t cache_full;
hbool_t size_decreased;
hbool_t resize_in_progress;
+ hbool_t msic_in_progress;
H5C_auto_size_ctl_t resize_ctl;
/* Fields for epoch markers used in automatic cache size adjustment */