From 8a647d436fbbeaec3838781280e74ef531917f61 Mon Sep 17 00:00:00 2001
From: Bartosz Sosnowski <bartosz@janeasystems.com>
Date: Thu, 1 Nov 2018 11:10:03 +0100
Subject: [PATCH] win, tcp: avoid starving the loop

Limit the time a TCP read callback can be called on a single loop
iteration to 32.

Ref: https://github.com/libuv/libuv/commit/738b31eb3aff440ae75ff9f32ba61086a948c3f4
Fixes: https://github.com/libuv/libuv/issues/2027
PR-URL: https://github.com/libuv/libuv/pull/2049
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
---
 src/win/tcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/win/tcp.c b/src/win/tcp.c
index 8b6f0a5c99b..3ce5548c0a4 100644
--- a/src/win/tcp.c
+++ b/src/win/tcp.c
@@ -945,6 +945,7 @@ void uv_process_tcp_read_req(uv_loop_t* loop, uv_tcp_t* handle,
     uv_req_t* req) {
   DWORD bytes, flags, err;
   uv_buf_t buf;
+  int count;
 
   assert(handle->type == UV_TCP);
 
@@ -999,7 +1000,8 @@ void uv_process_tcp_read_req(uv_loop_t* loop, uv_tcp_t* handle,
     }
 
     /* Do nonblocking reads until the buffer is empty */
-    while (handle->flags & UV_HANDLE_READING) {
+    count = 32;
+    while ((handle->flags & UV_HANDLE_READING) && (count-- > 0)) {
       buf = uv_buf_init(NULL, 0);
       handle->alloc_cb((uv_handle_t*) handle, 65536, &buf);
       if (buf.base == NULL || buf.len == 0) {