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fix race conditions in instance id-to-key lookup

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this is just an intermediate step: firstly, iid-to-key lookup is a linear scan; secondly, the lookup should happen on the RHC or the WHC and not on some internal map to associates key values with instance handles and is independent of entities

Signed-off-by: Erik Boasson <eb@ilities.com>
This commit is contained in:
Erik Boasson 2018-12-19 13:29:53 +01:00
parent 0f7ce1ac43
commit 179a35d192
3 changed files with 45 additions and 74 deletions
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44
src/core/ddsc/src/dds_instance.c
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@ -250,9 +250,7 @@ dds_unregister_instance_ih_ts(
bool autodispose = true;
dds_write_action action = DDS_WR_ACTION_UNREGISTER;
dds_entity *wr;
struct ddsi_tkmap *map;
const dds_topic *topic;
void *sample;
struct ddsi_tkmap_instance *tk;
rc = dds_entity_lock(writer, DDS_KIND_WRITER, &wr);
if (rc != DDS_RETCODE_OK) {
@ -269,19 +267,21 @@ dds_unregister_instance_ih_ts(
action |= DDS_WR_DISPOSE_BIT;
}
map = gv.m_tkmap;
if (asleep) {
thread_state_awake(thr);
}
topic = dds_instance_info((dds_entity*)wr);
sample = ddsi_sertopic_alloc_sample (topic->m_stopic);
if (ddsi_tkmap_get_key (map, topic->m_stopic, handle, sample)) {
tk = ddsi_tkmap_find_by_id (gv.m_tkmap, handle);
if (tk) {
struct ddsi_sertopic *tp = ((dds_writer*) wr)->m_topic->m_stopic;
void *sample = ddsi_sertopic_alloc_sample (tp);
ddsi_serdata_topicless_to_sample (tp, tk->m_sample, sample, NULL, NULL);
ddsi_tkmap_instance_unref (tk);
ret = dds_write_impl ((dds_writer*)wr, sample, timestamp, action);
} else{
ddsi_sertopic_free_sample (tp, sample, DDS_FREE_ALL);
} else {
DDS_ERROR("No instance related with the provided handle is found\n");
ret = DDS_ERRNO(DDS_RETCODE_PRECONDITION_NOT_MET);
}
ddsi_sertopic_free_sample (topic->m_stopic, sample, DDS_FREE_ALL);
if (asleep) {
thread_state_asleep(thr);
}
@ -387,14 +387,17 @@ dds_dispose_ih_ts(
if (rc == DDS_RETCODE_OK) {
struct thread_state1 * const thr = lookup_thread_state();
const bool asleep = !vtime_awake_p(thr->vtime);
struct ddsi_tkmap *map = gv.m_tkmap;
const dds_topic *topic = dds_instance_info((dds_entity*)wr);
void *sample = ddsi_sertopic_alloc_sample (topic->m_stopic);
struct ddsi_tkmap_instance *tk;
if (asleep) {
thread_state_awake(thr);
}
if (ddsi_tkmap_get_key (map, topic->m_stopic, handle, sample)) {
ret = dds_dispose_impl(wr, sample, handle, timestamp);
if ((tk = ddsi_tkmap_find_by_id (gv.m_tkmap, handle)) != NULL) {
struct ddsi_sertopic *tp = ((dds_writer*) wr)->m_topic->m_stopic;
void *sample = ddsi_sertopic_alloc_sample (tp);
ddsi_serdata_topicless_to_sample (tp, tk->m_sample, sample, NULL, NULL);
ddsi_tkmap_instance_unref (tk);
ret = dds_dispose_impl (wr, sample, handle, timestamp);
ddsi_sertopic_free_sample (tp, sample, DDS_FREE_ALL);
} else {
DDS_ERROR("No instance related with the provided handle is found\n");
ret = DDS_ERRNO(DDS_RETCODE_PRECONDITION_NOT_MET);
@ -402,7 +405,6 @@ dds_dispose_ih_ts(
if (asleep) {
thread_state_asleep(thr);
}
ddsi_sertopic_free_sample (topic->m_stopic, sample, DDS_FREE_ALL);
dds_writer_unlock(wr);
} else {
DDS_ERROR("Error occurred on locking writer\n");
@ -461,14 +463,14 @@ _Pre_satisfies_(entity & DDS_ENTITY_KIND_MASK)
dds_return_t
dds_instance_get_key(
dds_entity_t entity,
dds_instance_handle_t inst,
dds_instance_handle_t ih,
void *data)
{
struct thread_state1 * const thr = lookup_thread_state();
const bool asleep = !vtime_awake_p(thr->vtime);
dds_return_t ret;
const dds_topic * topic;
struct ddsi_tkmap * map = gv.m_tkmap;
struct ddsi_tkmap_instance * tk;
if(data == NULL){
DDS_ERROR("Argument data is NULL\n");
@ -482,13 +484,15 @@ dds_instance_get_key(
ret = DDS_ERRNO(DDS_RETCODE_BAD_PARAMETER);
goto err;
}
ddsi_sertopic_zero_sample (topic->m_stopic, data);
if (asleep) {
thread_state_awake(thr);
}
if (ddsi_tkmap_get_key (map, topic->m_stopic, inst, data)) {
if ((tk = ddsi_tkmap_find_by_id(gv.m_tkmap, ih)) != NULL) {
ddsi_sertopic_zero_sample (topic->m_stopic, data);
ddsi_serdata_topicless_to_sample (topic->m_stopic, tk->m_sample, data, NULL, NULL);
ddsi_tkmap_instance_unref (tk);
ret = DDS_RETCODE_OK;
} else{
} else {
DDS_ERROR("No instance related with the provided entity is found\n");
ret = DDS_ERRNO(DDS_RETCODE_BAD_PARAMETER);
}