Initial checkin of gRPC to third_party/

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

Index: third_party/grpc/src/core/iomgr/workqueue_posix.c
diff --git a/third_party/grpc/src/core/iomgr/workqueue_posix.c b/third_party/grpc/src/core/iomgr/workqueue_posix.c
new file mode 100644
index 0000000000000000000000000000000000000000..c096dbfb30caff8166ea24abd6779bcd809aa615
--- /dev/null
+++ b/third_party/grpc/src/core/iomgr/workqueue_posix.c
@@ -0,0 +1,144 @@
+/*
+ *
+ * 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 <grpc/support/port_platform.h>
+
+#ifdef GPR_POSIX_SOCKET
+
+#include "src/core/iomgr/workqueue.h"
+
+#include <stdio.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/iomgr/fd_posix.h"
+#include "src/core/iomgr/pollset_posix.h"
+
+static void on_readable(grpc_exec_ctx *exec_ctx, void *arg, bool success);
+
+grpc_workqueue *grpc_workqueue_create(grpc_exec_ctx *exec_ctx) {
+  char name[32];
+  grpc_workqueue *workqueue = gpr_malloc(sizeof(grpc_workqueue));
+  gpr_ref_init(&workqueue->refs, 1);
+  gpr_mu_init(&workqueue->mu);
+  workqueue->closure_list.head = workqueue->closure_list.tail = NULL;
+  grpc_wakeup_fd_init(&workqueue->wakeup_fd);
+  sprintf(name, "workqueue:%p", (void *)workqueue);
+  workqueue->wakeup_read_fd =
+      grpc_fd_create(GRPC_WAKEUP_FD_GET_READ_FD(&workqueue->wakeup_fd), name);
+  grpc_closure_init(&workqueue->read_closure, on_readable, workqueue);
+  grpc_fd_notify_on_read(exec_ctx, workqueue->wakeup_read_fd,
+                         &workqueue->read_closure);
+  return workqueue;
+}
+
+static void workqueue_destroy(grpc_exec_ctx *exec_ctx,
+                              grpc_workqueue *workqueue) {
+  GPR_ASSERT(grpc_closure_list_empty(workqueue->closure_list));
+  grpc_fd_shutdown(exec_ctx, workqueue->wakeup_read_fd);
+}
+
+#ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG
+void grpc_workqueue_ref(grpc_workqueue *workqueue, const char *file, int line,
+                        const char *reason) {
+  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "WORKQUEUE:%p   ref %d -> %d %s",
+          workqueue, (int)workqueue->refs.count, (int)workqueue->refs.count + 1,
+          reason);
+#else
+void grpc_workqueue_ref(grpc_workqueue *workqueue) {
+#endif
+  gpr_ref(&workqueue->refs);
+}
+
+#ifdef GRPC_WORKQUEUE_REFCOUNT_DEBUG
+void grpc_workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue,
+                          const char *file, int line, const char *reason) {
+  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "WORKQUEUE:%p unref %d -> %d %s",
+          workqueue, (int)workqueue->refs.count, (int)workqueue->refs.count - 1,
+          reason);
+#else
+void grpc_workqueue_unref(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue) {
+#endif
+  if (gpr_unref(&workqueue->refs)) {
+    workqueue_destroy(exec_ctx, workqueue);
+  }
+}
+
+void grpc_workqueue_add_to_pollset(grpc_exec_ctx *exec_ctx,
+                                   grpc_workqueue *workqueue,
+                                   grpc_pollset *pollset) {
+  grpc_pollset_add_fd(exec_ctx, pollset, workqueue->wakeup_read_fd);
+}
+
+void grpc_workqueue_flush(grpc_exec_ctx *exec_ctx, grpc_workqueue *workqueue) {
+  gpr_mu_lock(&workqueue->mu);
+  if (grpc_closure_list_empty(workqueue->closure_list)) {
+    grpc_wakeup_fd_wakeup(&workqueue->wakeup_fd);
+  }
+  grpc_closure_list_move(&exec_ctx->closure_list, &workqueue->closure_list);
+  gpr_mu_unlock(&workqueue->mu);
+}
+
+static void on_readable(grpc_exec_ctx *exec_ctx, void *arg, bool success) {
+  grpc_workqueue *workqueue = arg;
+
+  if (!success) {
+    gpr_mu_destroy(&workqueue->mu);
+    /* HACK: let wakeup_fd code know that we stole the fd */
+    workqueue->wakeup_fd.read_fd = 0;
+    grpc_wakeup_fd_destroy(&workqueue->wakeup_fd);
+    grpc_fd_orphan(exec_ctx, workqueue->wakeup_read_fd, NULL, NULL, "destroy");
+    gpr_free(workqueue);
+  } else {
+    gpr_mu_lock(&workqueue->mu);
+    grpc_closure_list_move(&workqueue->closure_list, &exec_ctx->closure_list);
+    grpc_wakeup_fd_consume_wakeup(&workqueue->wakeup_fd);
+    gpr_mu_unlock(&workqueue->mu);
+    grpc_fd_notify_on_read(exec_ctx, workqueue->wakeup_read_fd,
+                           &workqueue->read_closure);
+  }
+}
+
+void grpc_workqueue_push(grpc_workqueue *workqueue, grpc_closure *closure,
+                         int success) {
+  gpr_mu_lock(&workqueue->mu);
+  if (grpc_closure_list_empty(workqueue->closure_list)) {
+    grpc_wakeup_fd_wakeup(&workqueue->wakeup_fd);
+  }
+  grpc_closure_list_add(&workqueue->closure_list, closure, success);
+  gpr_mu_unlock(&workqueue->mu);
+}
+
+#endif /* GPR_POSIX_SOCKET */