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win: optimize udp receive performance (libuv#3807)
Do at most 32 nonblocking udp receive in a row. Fixes: libuv#3704
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| /* Copyright The libuv project and contributors. All rights reserved. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to | ||
| * deal in the Software without restriction, including without limitation the | ||
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
| * IN THE SOFTWARE. | ||
| */ | ||
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| #include "uv.h" | ||
| #include "task.h" | ||
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| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| static uv_udp_t server; | ||
| static uv_udp_t client; | ||
| static uv_check_t check_handle; | ||
| static uv_buf_t buf; | ||
| static struct sockaddr_in addr; | ||
| static char send_data[10]; | ||
| static int check_cb_called; | ||
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| #define N 5 | ||
| static int recv_cnt; | ||
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| static void alloc_cb(uv_handle_t* handle, | ||
| size_t suggested_size, | ||
| uv_buf_t* buf) { | ||
| static char slab[sizeof(send_data)]; | ||
| buf->base = slab; | ||
| buf->len = sizeof(slab); | ||
| } | ||
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| static void sv_recv_cb(uv_udp_t* handle, | ||
| ssize_t nread, | ||
| const uv_buf_t* rcvbuf, | ||
| const struct sockaddr* addr, | ||
| unsigned flags) { | ||
| if (++ recv_cnt < N) { | ||
| ASSERT_EQ(sizeof(send_data), nread); | ||
| } else { | ||
| ASSERT_EQ(0, nread); | ||
| } | ||
| } | ||
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| static void check_cb(uv_check_t* handle) { | ||
| ASSERT_PTR_EQ(&check_handle, handle); | ||
|
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| /** | ||
| * sv_recv_cb() is called with nread set to zero to indicate | ||
| * there is no more udp packet in the kernel, so the actual | ||
| * recv_cnt is one larger than N. | ||
| */ | ||
| ASSERT_EQ(N+1, recv_cnt); | ||
| check_cb_called = 1; | ||
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| /* we are done */ | ||
| ASSERT_EQ(0, uv_check_stop(handle)); | ||
| uv_close((uv_handle_t*) &client, NULL); | ||
| uv_close((uv_handle_t*) &check_handle, NULL); | ||
| uv_close((uv_handle_t*) &server, NULL); | ||
| } | ||
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| TEST_IMPL(udp_recv_in_a_row) { | ||
| int i, r; | ||
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| ASSERT_EQ(0, uv_check_init(uv_default_loop(), &check_handle)); | ||
| ASSERT_EQ(0, uv_check_start(&check_handle, check_cb)); | ||
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| ASSERT_EQ(0, uv_ip4_addr("127.0.0.1", TEST_PORT, &addr)); | ||
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| ASSERT_EQ(0, uv_udp_init(uv_default_loop(), &server)); | ||
| ASSERT_EQ(0, uv_udp_bind(&server, (const struct sockaddr*) &addr, 0)); | ||
| ASSERT_EQ(0, uv_udp_recv_start(&server, alloc_cb, sv_recv_cb)); | ||
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| ASSERT_EQ(0, uv_udp_init(uv_default_loop(), &client)); | ||
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| /* send N-1 udp packets */ | ||
| buf = uv_buf_init(send_data, sizeof(send_data)); | ||
| for (i = 0; i < N - 1; i ++) { | ||
| r = uv_udp_try_send(&client, | ||
| &buf, | ||
| 1, | ||
| (const struct sockaddr*) &addr); | ||
| ASSERT_EQ(sizeof(send_data), r); | ||
| } | ||
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| /* send an empty udp packet */ | ||
| buf = uv_buf_init(NULL, 0); | ||
| r = uv_udp_try_send(&client, | ||
| &buf, | ||
| 1, | ||
| (const struct sockaddr*) &addr); | ||
| ASSERT_EQ(0, r); | ||
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| /* check_cb() asserts that the N packets can be received | ||
| * before it gets called. | ||
| */ | ||
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| ASSERT_EQ(0, uv_run(uv_default_loop(), UV_RUN_DEFAULT)); | ||
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| ASSERT(check_cb_called); | ||
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| MAKE_VALGRIND_HAPPY(); | ||
| return 0; | ||
| } |