Initial checkin of gRPC to third_party/

third_party/grpc/src/core/iomgr/iomgr.c

+/*
+ *
+ * Copyright 2015-2016, 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 "src/core/iomgr/iomgr.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/iomgr/iomgr_internal.h"
+#include "src/core/iomgr/timer.h"
+#include "src/core/support/env.h"
+#include "src/core/support/string.h"
+
+static gpr_mu g_mu;
+static gpr_cv g_rcv;
+static int g_shutdown;
+static grpc_iomgr_object g_root_object;
+
+void grpc_iomgr_init(void) {
+  g_shutdown = 0;
+  gpr_mu_init(&g_mu);
+  gpr_cv_init(&g_rcv);
+  grpc_timer_list_init(gpr_now(GPR_CLOCK_MONOTONIC));
+  g_root_object.next = g_root_object.prev = &g_root_object;
+  g_root_object.name = "root";
+  grpc_iomgr_platform_init();
+  grpc_pollset_global_init();
+}
+
+static size_t count_objects(void) {
+  grpc_iomgr_object *obj;
+  size_t n = 0;
+  for (obj = g_root_object.next; obj != &g_root_object; obj = obj->next) {
+    n++;
+  }
+  return n;
+}
+
+static void dump_objects(const char *kind) {
+  grpc_iomgr_object *obj;
+  for (obj = g_root_object.next; obj != &g_root_object; obj = obj->next) {
+    gpr_log(GPR_DEBUG, "%s OBJECT: %s %p", kind, obj->name, obj);
+  }
+}
+
+void grpc_iomgr_shutdown(void) {
+  gpr_timespec shutdown_deadline = gpr_time_add(
+      gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_seconds(10, GPR_TIMESPAN));
+  gpr_timespec last_warning_time = gpr_now(GPR_CLOCK_REALTIME);
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+
+  grpc_iomgr_platform_flush();
+
+  gpr_mu_lock(&g_mu);
+  g_shutdown = 1;
+  while (g_root_object.next != &g_root_object) {
+    if (gpr_time_cmp(
+            gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), last_warning_time),
+            gpr_time_from_seconds(1, GPR_TIMESPAN)) >= 0) {
+      if (g_root_object.next != &g_root_object) {
+        gpr_log(GPR_DEBUG, "Waiting for %d iomgr objects to be destroyed",
+                count_objects());
+      }
+      last_warning_time = gpr_now(GPR_CLOCK_REALTIME);
+    }
+    if (grpc_timer_check(&exec_ctx, gpr_inf_future(GPR_CLOCK_MONOTONIC),
+                         NULL)) {
+      gpr_mu_unlock(&g_mu);
+      grpc_exec_ctx_flush(&exec_ctx);
+      gpr_mu_lock(&g_mu);
+      continue;
+    }
+    if (g_root_object.next != &g_root_object) {
+      gpr_timespec short_deadline = gpr_time_add(
+          gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(100, GPR_TIMESPAN));
+      if (gpr_cv_wait(&g_rcv, &g_mu, short_deadline)) {
+        if (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), shutdown_deadline) > 0) {
+          if (g_root_object.next != &g_root_object) {
+            gpr_log(GPR_DEBUG,
+                    "Failed to free %d iomgr objects before shutdown deadline: "
+                    "memory leaks are likely",
+                    count_objects());
+            dump_objects("LEAKED");
+            if (grpc_iomgr_abort_on_leaks()) {
+              abort();
+            }
+          }
+          break;
+        }
+      }
+    }
+  }
+  gpr_mu_unlock(&g_mu);
+
+  grpc_timer_list_shutdown(&exec_ctx);
+  grpc_exec_ctx_finish(&exec_ctx);
+
+  /* ensure all threads have left g_mu */
+  gpr_mu_lock(&g_mu);
+  gpr_mu_unlock(&g_mu);
+
+  grpc_pollset_global_shutdown();
+  grpc_iomgr_platform_shutdown();
+  gpr_mu_destroy(&g_mu);
+  gpr_cv_destroy(&g_rcv);
+}
+
+void grpc_iomgr_register_object(grpc_iomgr_object *obj, const char *name) {
+  obj->name = gpr_strdup(name);
+  gpr_mu_lock(&g_mu);
+  obj->next = &g_root_object;
+  obj->prev = g_root_object.prev;
+  obj->next->prev = obj->prev->next = obj;
+  gpr_mu_unlock(&g_mu);
+}
+
+void grpc_iomgr_unregister_object(grpc_iomgr_object *obj) {
+  gpr_mu_lock(&g_mu);
+  obj->next->prev = obj->prev;
+  obj->prev->next = obj->next;
+  gpr_cv_signal(&g_rcv);
+  gpr_mu_unlock(&g_mu);
+  gpr_free(obj->name);
+}
+
+bool grpc_iomgr_abort_on_leaks(void) {
+  char *env = gpr_getenv("GRPC_ABORT_ON_LEAKS");
+  if (env == NULL) return false;
+  static const char *truthy[] = {"yes",  "Yes",  "YES", "true",
+                                 "True", "TRUE", "1"};
+  for (size_t i = 0; i < GPR_ARRAY_SIZE(truthy); i++) {
+    if (0 == strcmp(env, truthy[i])) return true;
+  }
+  return false;
+}