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authorSander Vrijders <sander.vrijders@intec.ugent.be>2016-05-17 22:18:09 +0200
committerSander Vrijders <sander.vrijders@intec.ugent.be>2016-05-17 22:18:09 +0200
commit39c326d7cc333e88cc6a608853290132299fae0d (patch)
treea9c9a626da1d143edd45a04cbbeb215debeebb1d /src
parent81e32e5d19bdc0dabd7473a31ddb0d6f1c95e18e (diff)
downloadouroboros-39c326d7cc333e88cc6a608853290132299fae0d.tar.gz
ouroboros-39c326d7cc333e88cc6a608853290132299fae0d.zip
lib: Add missing check upon garbage collection
There was a check missing upon garbage collection. If the whole DU map has been used once, all DUs will have their garbage bit set to one. This meant that the garbage collector would keep moving the tail indefinitely.
Diffstat (limited to 'src')
-rw-r--r--src/lib/shm_du_map.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/lib/shm_du_map.c b/src/lib/shm_du_map.c
index 1bd89744..e207c05e 100644
--- a/src/lib/shm_du_map.c
+++ b/src/lib/shm_du_map.c
@@ -334,7 +334,6 @@ int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx)
long sz;
long blocks = 0;
-
if (idx > SHM_BLOCKS_IN_MAP)
return -1;
@@ -352,7 +351,8 @@ int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx)
return 0;
}
- while (get_tail_ptr(dum)->garbage == 1) {
+ while (get_tail_ptr(dum)->garbage == 1 &&
+ *dum->ptr_tail != *dum->ptr_head) {
sz = get_tail_ptr(dum)->size;
while (sz + (long) sizeof(struct shm_du_buff) > 0) {
sz -= SHM_DU_BUFF_BLOCK_SIZE;
@@ -361,6 +361,7 @@ int shm_release_du_buff(struct shm_du_map * dum, ssize_t idx)
*(dum->ptr_tail) =
(*dum->ptr_tail + blocks) & (SHM_BLOCKS_IN_MAP - 1);
+
blocks = 0;
}