diff options
Diffstat (limited to 'src/core/lib/iomgr/network_status_tracker.c')
-rw-r--r-- | src/core/lib/iomgr/network_status_tracker.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/network_status_tracker.c b/src/core/lib/iomgr/network_status_tracker.c new file mode 100644 index 0000000000..38a1c9b7d4 --- /dev/null +++ b/src/core/lib/iomgr/network_status_tracker.c @@ -0,0 +1,121 @@ +/* + * + * Copyright 2015, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include "src/core/lib/iomgr/endpoint.h" + +typedef struct endpoint_ll_node { + grpc_endpoint *ep; + struct endpoint_ll_node *next; +} endpoint_ll_node; + +static endpoint_ll_node *head = NULL; +static gpr_mu g_endpoint_mutex; +static bool g_init_done = false; + +void grpc_initialize_network_status_monitor() { + g_init_done = true; + gpr_mu_init(&g_endpoint_mutex); + // TODO(makarandd): Install callback with OS to monitor network status. +} + +void grpc_destroy_network_status_monitor() { + for (endpoint_ll_node *curr = head; curr != NULL;) { + endpoint_ll_node *next = curr->next; + gpr_free(curr); + curr = next; + } + gpr_mu_destroy(&g_endpoint_mutex); +} + +void grpc_network_status_register_endpoint(grpc_endpoint *ep) { + if (!g_init_done) { + grpc_initialize_network_status_monitor(); + } + gpr_mu_lock(&g_endpoint_mutex); + if (head == NULL) { + head = (endpoint_ll_node *)gpr_malloc(sizeof(endpoint_ll_node)); + head->ep = ep; + head->next = NULL; + } else { + endpoint_ll_node *prev_head = head; + head = (endpoint_ll_node *)gpr_malloc(sizeof(endpoint_ll_node)); + head->ep = ep; + head->next = prev_head; + } + gpr_mu_unlock(&g_endpoint_mutex); +} + +void grpc_network_status_unregister_endpoint(grpc_endpoint *ep) { + gpr_mu_lock(&g_endpoint_mutex); + GPR_ASSERT(head); + bool found = false; + endpoint_ll_node *prev = head; + // if we're unregistering the head, just move head to the next + if (ep == head->ep) { + head = head->next; + gpr_free(prev); + found = true; + } else { + for (endpoint_ll_node *curr = head->next; curr != NULL; curr = curr->next) { + if (ep == curr->ep) { + prev->next = curr->next; + gpr_free(curr); + found = true; + break; + } + prev = curr; + } + } + gpr_mu_unlock(&g_endpoint_mutex); + GPR_ASSERT(found); +} + +// Walk the linked-list from head and execute shutdown. It is possible that +// other threads might be in the process of shutdown as well, but that has +// no side effect since endpoint shutdown is idempotent. +void grpc_network_status_shutdown_all_endpoints() { + gpr_mu_lock(&g_endpoint_mutex); + if (head == NULL) { + gpr_mu_unlock(&g_endpoint_mutex); + return; + } + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + + for (endpoint_ll_node *curr = head; curr != NULL; curr = curr->next) { + curr->ep->vtable->shutdown(&exec_ctx, curr->ep); + } + gpr_mu_unlock(&g_endpoint_mutex); + grpc_exec_ctx_finish(&exec_ctx); +} |