From 2c287ca750c114c7230e57a1231d7e22863ab53d Mon Sep 17 00:00:00 2001
From: murgatroid99 <mlumish@google.com>
Date: Fri, 7 Oct 2016 09:55:35 -0700
Subject: UV tests pass on linux

---
 src/core/lib/iomgr/pollset_uv.c | 77 +++++++++++++++++++++++++++++++++++++----
 1 file changed, 71 insertions(+), 6 deletions(-)

(limited to 'src/core/lib/iomgr/pollset_uv.c')

diff --git a/src/core/lib/iomgr/pollset_uv.c b/src/core/lib/iomgr/pollset_uv.c
index b304eb64de..8f4e20f296 100644
--- a/src/core/lib/iomgr/pollset_uv.c
+++ b/src/core/lib/iomgr/pollset_uv.c
@@ -35,40 +35,105 @@
 
 #ifdef GRPC_UV
 
+#include <uv.h>
+
+#include <string.h>
+
+#include <grpc/support/log.h>
 #include <grpc/support/sync.h>
 
 #include "src/core/lib/iomgr/pollset.h"
 #include "src/core/lib/iomgr/pollset_uv.h"
 
+struct grpc_pollset {
+  uv_timer_t timer;
+  int shutting_down;
+};
+
+/* Indicates that grpc_pollset_work should run an iteration of the UV loop
+   before running callbacks. This defaults to 1, and should be disabled if
+   grpc_pollset_work will be called within the callstack of uv_run */
+int grpc_pollset_work_run_loop;
+
 gpr_mu grpc_polling_mu;
 
-size_t grpc_pollset_size() { return 1; }
+size_t grpc_pollset_size() { return sizeof(grpc_pollset); }
 
-void grpc_pollset_global_init(void) { gpr_mu_init(&grpc_polling_mu); }
+void grpc_pollset_global_init(void) {
+  gpr_mu_init(&grpc_polling_mu);
+  grpc_pollset_work_run_loop = 1;
+}
 
 void grpc_pollset_global_shutdown(void) { gpr_mu_destroy(&grpc_polling_mu); }
 
 void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) {
   *mu = &grpc_polling_mu;
+  memset(pollset, 0, sizeof(grpc_pollset));
+  uv_timer_init(uv_default_loop(), &pollset->timer);
+  pollset->shutting_down = 0;
+}
+
+static void timer_close_cb(uv_handle_t *handle) {
+  handle->data = (void *)1;
 }
 
 void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
                            grpc_closure *closure) {
+  GPR_ASSERT(!pollset->shutting_down);
+  pollset->shutting_down = 1;
+  if (grpc_pollset_work_run_loop) {
+    // Drain any pending UV callbacks without blocking
+    uv_run(uv_default_loop(), UV_RUN_NOWAIT);
+  }
   grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL);
 }
 
-void grpc_pollset_destroy(grpc_pollset *pollset) {}
+void grpc_pollset_destroy(grpc_pollset *pollset) {
+  uv_close((uv_handle_t*)&pollset->timer, timer_close_cb);
+  // timer.data is a boolean indicating that the timer has finished closing
+  pollset->timer.data = (void *)0;
+  if (grpc_pollset_work_run_loop) {
+    while (!pollset->timer.data) {
+      uv_run(uv_default_loop(), UV_RUN_NOWAIT);
+    }
+  }
+}
 
-void grpc_pollset_reset(grpc_pollset *pollset) {}
+void grpc_pollset_reset(grpc_pollset *pollset) {
+  GPR_ASSERT(pollset->shutting_down);
+  pollset->shutting_down = 0;
+}
+
+static void timer_run_cb(uv_timer_t *timer) {
+}
 
 grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
                               grpc_pollset_worker **worker_hdl,
                               gpr_timespec now, gpr_timespec deadline) {
+  uint64_t timeout;
+  gpr_mu_unlock(&grpc_polling_mu);
+  if (grpc_pollset_work_run_loop) {
+    if (gpr_time_cmp(deadline, now) >= 0) {
+      timeout = (uint64_t)gpr_time_to_millis(gpr_time_sub(deadline, now));
+    } else {
+      timeout = 0;
+    }
+    /* We special-case timeout=0 so that we don't bother with the timer when
+       the loop won't block anyway */
+    if (timeout > 0) {
+      uv_timer_start(&pollset->timer, timer_run_cb, timeout, 0);
+      /* Run until there is some I/O activity or the timer triggers. It doesn't
+         matter which happens */
+      uv_run(uv_default_loop(), UV_RUN_ONCE);
+      uv_timer_stop(&pollset->timer);
+    } else {
+      uv_run(uv_default_loop(), UV_RUN_NOWAIT);
+    }
+  }
   if (!grpc_closure_list_empty(exec_ctx->closure_list)) {
-    gpr_mu_unlock(&grpc_polling_mu);
     grpc_exec_ctx_flush(exec_ctx);
-    gpr_mu_lock(&grpc_polling_mu);
   }
+  gpr_mu_lock(&grpc_polling_mu);
   return GRPC_ERROR_NONE;
 }
 
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