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win, tcp: avoid starving the loop

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

Ref: 738b31eb3a
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>
This commit is contained in:
Bartosz Sosnowski 2018-11-01 11:10:03 +01:00
parent 6dd44caa35
commit 8a647d436f
1 changed files with 3 additions and 1 deletions
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4
src/win/tcp.c
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@ -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) {