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Fix refcounting problem, closure reordering problem

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reviewable/pr4232/r5
Craig Tiller 9 years ago
parent 2a1bb7f0ca
commit e2a6510ab9
1 changed files with 68 additions and 83 deletions
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  1. 151
      src/core/client_config/lb_policies/round_robin.c

151
src/core/client_config/lb_policies/round_robin.c
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@ -38,6 +38,8 @@
#include <grpc/support/alloc.h>
#include "src/core/transport/connectivity_state.h"
typedef struct round_robin_lb_policy round_robin_lb_policy;
int grpc_lb_round_robin_trace = 0;
/** List of entities waiting for a pick.
@ -58,22 +60,27 @@ typedef struct ready_list {
} ready_list;
typedef struct {
size_t subchannel_idx; /**< Index over p->subchannels */
void *p; /**< round_robin_lb_policy instance */
} connectivity_changed_cb_arg;
typedef struct {
/** index within policy->subchannels */
size_t index;
/** backpointer to owning policy */
round_robin_lb_policy *policy;
/** subchannel itself */
grpc_subchannel *subchannel;
/** notification that connectivity has changed on subchannel */
grpc_closure connectivity_changed_closure;
/** this subchannels current position in subchannel->ready_list */
ready_list *ready_list_node;
/** last observed connectivity */
grpc_connectivity_state connectivity_state;
} subchannel_data;
struct round_robin_lb_policy {
/** base policy: must be first */
grpc_lb_policy base;
/** all our subchannels */
grpc_subchannel **subchannels;
size_t num_subchannels;
/** Callbacks, one per subchannel being watched, to be called when their
* respective connectivity changes */
grpc_closure *connectivity_changed_cbs;
connectivity_changed_cb_arg *cb_args;
subchannel_data **subchannels;
/** mutex protecting remaining members */
gpr_mu mu;
@ -81,8 +88,6 @@ typedef struct {
int started_picking;
/** are we shutting down? */
int shutdown;
/** Connectivity state of the subchannels being watched */
grpc_connectivity_state *subchannel_connectivity;
/** List of picks that are waiting on connectivity */
pending_pick *pending_picks;
@ -93,13 +98,7 @@ typedef struct {
ready_list ready_list;
/** Last pick from the ready list. */
ready_list *ready_list_last_pick;
/** Subchannel index to ready_list node.
*
* Kept in order to remove nodes from the ready list associated with a
* subchannel */
ready_list **subchannel_index_to_readylist_node;
} round_robin_lb_policy;
};
/** Returns the next subchannel from the connected list or NULL if the list is
* empty.
@ -205,10 +204,10 @@ void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
size_t i;
ready_list *elem;
for (i = 0; i < p->num_subchannels; i++) {
GRPC_SUBCHANNEL_UNREF(exec_ctx, p->subchannels[i], "round_robin");
subchannel_data *sd = p->subchannels[i];
GRPC_SUBCHANNEL_UNREF(exec_ctx, sd->subchannel, "round_robin");
gpr_free(sd);
}
gpr_free(p->connectivity_changed_cbs);
gpr_free(p->subchannel_connectivity);
grpc_connectivity_state_destroy(exec_ctx, &p->state_tracker);
gpr_free(p->subchannels);
@ -224,8 +223,6 @@ void rr_destroy(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol) {
gpr_free(elem);
elem = tmp;
}
gpr_free(p->subchannel_index_to_readylist_node);
gpr_free(p->cb_args);
gpr_free(p);
}
@ -248,10 +245,11 @@ gpr_log(GPR_DEBUG, "LB_POLICY: rr_shutdown: p=%p num_subchannels=%d", p, p->num_
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
GRPC_CHANNEL_FATAL_FAILURE, "shutdown");
for (i = 0; i < p->num_subchannels; i++) {
grpc_subchannel_notify_on_state_change(exec_ctx, p->subchannels[i],
subchannel_data *sd = p->subchannels[i];
grpc_subchannel_notify_on_state_change(exec_ctx, sd->subchannel,
NULL,
NULL,
&p->connectivity_changed_cbs[i]);
&sd->connectivity_changed_closure);
}
gpr_mu_unlock(&p->mu);
}
@ -286,11 +284,12 @@ static void start_picking(grpc_exec_ctx *exec_ctx, round_robin_lb_policy *p) {
gpr_log(GPR_DEBUG, "LB_POLICY: p=%p num_subchannels=%d", p, p->num_subchannels);
for (i = 0; i < p->num_subchannels; i++) {
p->subchannel_connectivity[i] = GRPC_CHANNEL_IDLE;
grpc_subchannel_notify_on_state_change(exec_ctx, p->subchannels[i],
subchannel_data *sd = p->subchannels[i];
sd->connectivity_state = GRPC_CHANNEL_IDLE;
grpc_subchannel_notify_on_state_change(exec_ctx, sd->subchannel,
&p->base.interested_parties,
&p->subchannel_connectivity[i],
&p->connectivity_changed_cbs[i]);
&sd->connectivity_state,
&sd->connectivity_changed_closure);
GRPC_LB_POLICY_WEAK_REF(&p->base, "round_robin_connectivity");
}
}
@ -340,33 +339,26 @@ int rr_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *pol, grpc_pollset *pollset,
static void rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg,
int iomgr_success) {
connectivity_changed_cb_arg *cb_arg = arg;
round_robin_lb_policy *p = cb_arg->p;
/* index over p->subchannels of this cb's subchannel */
const size_t this_idx = cb_arg->subchannel_idx;
subchannel_data *sd = arg;
round_robin_lb_policy *p = sd->policy;
pending_pick *pp;
ready_list *selected;
int unref = 0;
/* connectivity state of this cb's subchannel */
grpc_connectivity_state *this_connectivity;
gpr_mu_lock(&p->mu);
this_connectivity = &p->subchannel_connectivity[this_idx];
if (p->shutdown) {
unref = 1;
} else {
switch (*this_connectivity) {
switch (sd->connectivity_state) {
case GRPC_CHANNEL_READY:
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
GRPC_CHANNEL_READY, "connecting_ready");
/* add the newly connected subchannel to the list of connected ones.
* Note that it goes to the "end of the line". */
p->subchannel_index_to_readylist_node[this_idx] =
add_connected_sc_locked(p, p->subchannels[this_idx]);
sd->ready_list_node =
add_connected_sc_locked(p, sd->subchannel);
/* at this point we know there's at least one suitable subchannel. Go
* ahead and pick one and notify the pending suitors in
* p->pending_picks. This preemtively replicates rr_pick()'s actions. */
@ -391,52 +383,54 @@ static void rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg,
}
grpc_subchannel_notify_on_state_change(
exec_ctx,
p->subchannels[this_idx],
sd->subchannel,
&p->base.interested_parties,
this_connectivity,
&p->connectivity_changed_cbs[this_idx]);
&sd->connectivity_state,
&sd->connectivity_changed_closure);
break;
case GRPC_CHANNEL_CONNECTING:
case GRPC_CHANNEL_IDLE:
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
*this_connectivity, "connecting_changed");
sd->connectivity_state, "connecting_changed");
grpc_subchannel_notify_on_state_change(
exec_ctx, p->subchannels[this_idx],
exec_ctx, sd->subchannel,
&p->base.interested_parties,
this_connectivity,
&p->connectivity_changed_cbs[this_idx]);
&sd->connectivity_state,
&sd->connectivity_changed_closure);
break;
case GRPC_CHANNEL_TRANSIENT_FAILURE:
/* renew state notification */
grpc_subchannel_notify_on_state_change(
exec_ctx, p->subchannels[this_idx],
exec_ctx, sd->subchannel,
&p->base.interested_parties,
this_connectivity,
&p->connectivity_changed_cbs[this_idx]);
&sd->connectivity_state,
&sd->connectivity_changed_closure);
/* remove from ready list if still present */
if (p->subchannel_index_to_readylist_node[this_idx] != NULL) {
remove_disconnected_sc_locked(
p, p->subchannel_index_to_readylist_node[this_idx]);
p->subchannel_index_to_readylist_node[this_idx] = NULL;
if (sd->ready_list_node != NULL) {
remove_disconnected_sc_locked(p, sd->ready_list_node);
sd->ready_list_node = NULL;
}
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
GRPC_CHANNEL_TRANSIENT_FAILURE,
"connecting_transient_failure");
break;
case GRPC_CHANNEL_FATAL_FAILURE:
if (p->subchannel_index_to_readylist_node[this_idx] != NULL) {
if (sd->ready_list_node != NULL) {
remove_disconnected_sc_locked(
p, p->subchannel_index_to_readylist_node[this_idx]);
p->subchannel_index_to_readylist_node[this_idx] = NULL;
p, sd->ready_list_node);
sd->ready_list_node = NULL;
}
GPR_SWAP(grpc_subchannel *, p->subchannels[this_idx],
p->subchannels[p->num_subchannels - 1]);
p->num_subchannels--;
GRPC_SUBCHANNEL_UNREF(exec_ctx, p->subchannels[p->num_subchannels],
GPR_SWAP(subchannel_data *, p->subchannels[sd->index],
p->subchannels[p->num_subchannels]);
GRPC_SUBCHANNEL_UNREF(exec_ctx, sd->subchannel,
"round_robin");
p->subchannels[sd->index]->index = sd->index;
gpr_free(sd);
unref = 1;
if (p->num_subchannels == 0) {
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
GRPC_CHANNEL_FATAL_FAILURE,
@ -447,7 +441,6 @@ static void rr_connectivity_changed(grpc_exec_ctx *exec_ctx, void *arg,
grpc_exec_ctx_enqueue(exec_ctx, pp->on_complete, 1);
gpr_free(pp);
}
unref = 1;
} else {
grpc_connectivity_state_set(exec_ctx, &p->state_tracker,
GRPC_CHANNEL_TRANSIENT_FAILURE,
@ -499,27 +492,23 @@ static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
GPR_ASSERT(args->num_subchannels > 0);
memset(p, 0, sizeof(*p));
grpc_lb_policy_init(&p->base, &round_robin_lb_policy_vtable);
p->subchannels =
gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
p->num_subchannels = args->num_subchannels;
p->subchannels =
gpr_malloc(sizeof(*p->subchannels) * p->num_subchannels);
memset(p->subchannels, 0, sizeof(*p->subchannels) * p->num_subchannels);
grpc_connectivity_state_init(&p->state_tracker, GRPC_CHANNEL_IDLE,
"round_robin");
memcpy(p->subchannels, args->subchannels,
sizeof(grpc_subchannel *) * args->num_subchannels);
gpr_mu_init(&p->mu);
p->connectivity_changed_cbs =
gpr_malloc(sizeof(grpc_closure) * args->num_subchannels);
p->subchannel_connectivity =
gpr_malloc(sizeof(grpc_connectivity_state) * args->num_subchannels);
p->cb_args =
gpr_malloc(sizeof(connectivity_changed_cb_arg) * args->num_subchannels);
for (i = 0; i < args->num_subchannels; i++) {
p->cb_args[i].subchannel_idx = i;
p->cb_args[i].p = p;
grpc_closure_init(&p->connectivity_changed_cbs[i], rr_connectivity_changed,
&p->cb_args[i]);
subchannel_data *sd = gpr_malloc(sizeof(*sd));
memset(sd, 0, sizeof(*sd));
p->subchannels[i] = sd;
sd->policy = p;
sd->index = i;
sd->subchannel = args->subchannels[i];
grpc_closure_init(&sd->connectivity_changed_closure, rr_connectivity_changed,
sd);
}
/* The (dummy node) root of the ready list */
@ -528,10 +517,6 @@ static grpc_lb_policy *create_round_robin(grpc_lb_policy_factory *factory,
p->ready_list.next = NULL;
p->ready_list_last_pick = &p->ready_list;
p->subchannel_index_to_readylist_node =
gpr_malloc(sizeof(grpc_subchannel *) * args->num_subchannels);
memset(p->subchannel_index_to_readylist_node, 0,
sizeof(grpc_subchannel *) * args->num_subchannels);
return &p->base;
}

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