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Fix #125: Implement receive loop in async SHM multi-server handle_connection#144

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fix/125-async-shm-multi-server
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Fix #125: Implement receive loop in async SHM multi-server handle_connection#144
mcurrier2 wants to merge 1 commit into
mainfrom
fix/125-async-shm-multi-server

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Summary

  • Add receive loop in handle_connection() that reads messages via receive_message() and forwards them to the message_sender channel
  • Clone connection before inserting into map (use clone for receive, original for send operations)
  • Set ring buffer shutdown flag in close() before clearing connections, so blocked peers wake up cleanly (mirrors shared_memory_blocking.rs)
  • Remove connection from shared map when handler exits

Test plan

  • All shared memory unit tests pass (ring_buffer_wrap_around, communication, backpressure)
  • All integration tests pass
  • Clippy clean, MSRV 1.70 compatible
  • Multi-server path now delivers messages instead of hanging

Fixes #125

Made with Cursor

…nection

The multi-server handle_connection() registered connections in the map
but never read messages from them, causing the multi-client SHM path
to hang indefinitely with no messages delivered. Additionally, close()
did not set the ring buffer shutdown flag, leaving blocked peers
spinning until a 5-second timeout.

Changes:
- Add receive loop in handle_connection() that calls receive_message()
  and forwards to the message_sender channel
- Clone connection before inserting into map (SharedMemoryConnection is
  Clone) to allow concurrent receive and send operations
- Check shutdown flag between receive attempts for clean exit
- Remove connection from map on handler exit
- Set shutdown flag on all ring buffers in close() before clearing
  connections (mirrors shared_memory_blocking.rs behavior)
- All tests passing, clippy clean

AI-assisted-by: Claude Opus 4.6
Co-authored-by: Cursor <cursoragent@cursor.com>
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Reviewing files that changed from the base of the PR and between d586320 and d86f635.

📒 Files selected for processing (1)
  • src/ipc/shared_memory.rs

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📈 Changed lines coverage: 0.00% (0/16)

🚨 Uncovered lines in this PR

  • src/ipc/shared_memory.rs: 512, 520-523, 526-530, 535-537, 545-546, 548

📊 Code Coverage Summary

File Line Coverage Uncovered Lines
src/benchmark.rs 84.13%
(509/605)
75, 78, 89, 93, 102, 105, 107, 124, 424, 429-434, 441-446, 513-516, 621, 705, 717-719, 739, 808-810, 815, 836, 841, 859, 965, 969-972, 974, 983-986, 988, 1064, 1095, 1098, 1100-1101, 1110-1111, 1253, 1266, 1283, 1406, 1415, 1417-1418, 1421-1422, 1428-1429, 1434-1435, 1437, 1442-1443, 1447-1449, 1454-1455, 1458-1459, 1491, 1549-1553, 1555-1561, 1563, 1566, 1723, 1738
src/benchmark_blocking.rs 74.32%
(327/440)
97, 111, 127, 263, 369, 380-382, 402, 434, 495, 594, 607, 621, 651-654, 739-742, 761, 765, 780, 822, 824-826, 830, 833-835, 837, 840, 842-846, 848-849, 857-861, 863-867, 870-871, 875-876, 911, 960, 1042, 1053, 1083, 1086, 1151-1156, 1158, 1216-1219, 1224, 1237, 1240-1243, 1247, 1249-1252, 1254, 1256-1257, 1259-1260, 1263, 1265-1270, 1272, 1276-1277, 1279, 1281, 1305, 1317-1322, 1324, 1344-1347
src/cli.rs 92.39%
(85/92)
691, 790, 830, 832, 853-855
src/execution_mode.rs 100.00%
(14/14)
``
src/ipc/mod.rs 63.64%
(49/77)
134, 458, 460-463, 773-774, 789-790, 808-809, 840, 843, 846, 851, 878-879, 893, 895, 915, 917, 1040-1042, 1231-1233
src/ipc/posix_message_queue.rs 46.09%
(59/128)
139-140, 213-215, 217, 224, 229, 332-335, 337, 345, 437, 441-442, 446, 449-452, 454-458, 539, 679, 782, 789-790, 807-808, 819-820, 831-832, 849-850, 906, 910-911, 914-919, 921-923, 927, 929-931, 933, 935-937, 941-943, 945-947, 994-995, 1017
src/ipc/posix_message_queue_blocking.rs 72.16%
(127/176)
172, 182, 221, 251-255, 274, 325, 368, 387-390, 416-418, 422-423, 425-426, 436, 455, 457-458, 460-461, 474-475, 477-478, 484, 486-491, 493-495, 497-498, 503, 505-506, 508-509
src/ipc/shared_memory.rs 65.46%
(163/249)
69, 152, 156, 257-258, 268-269, 273, 401-402, 428-430, 432, 450-452, 454-455, 457-461, 478, 490, 496, 499-500, 504, 508, 512, 514-515, 520-523, 526-530, 535-537, 545-546, 548, 720-721, 724-725, 728, 730, 735-736, 763-764, 767-768, 775-777, 779, 781-786, 788-789, 792-793, 795-799, 806, 836, 838-839, 841, 845
src/ipc/shared_memory_blocking.rs 77.35%
(222/287)
199-201, 203-204, 207-209, 212-213, 215, 220, 222, 226-228, 233, 241-243, 246-248, 251-252, 254, 257, 260-261, 264-265, 269-270, 272, 276-277, 279, 315-316, 403-404, 428-432, 544, 552, 602, 619, 706, 772, 805-806, 808-809, 816, 833, 835-836, 838, 871, 880, 890, 912
src/ipc/shared_memory_direct.rs 83.25%
(159/191)
400-403, 472-479, 483, 511, 536-539, 543-544, 590-591, 603, 633, 640-641, 697-698, 704, 726, 731-732
src/ipc/tcp_socket.rs 59.43%
(63/106)
31-32, 61, 96, 113-114, 118, 124-125, 129, 136-137, 141, 147-148, 152, 171-172, 175-177, 184-185, 188, 362-363, 366-367, 370-371, 376-377, 422, 429, 447-449, 478, 480-482, 484, 487
src/ipc/tcp_socket_blocking.rs 94.23%
(98/104)
145, 170, 322-325
src/ipc/unix_domain_socket.rs 59.43%
(63/106)
29-30, 58, 93, 103, 122-123, 127, 133-134, 138, 145-146, 150, 156-157, 161, 180-181, 184-186, 193-194, 197, 346-347, 350-351, 354-355, 360-361, 412-414, 443, 445-447, 449, 452, 468
src/ipc/unix_domain_socket_blocking.rs 92.06%
(116/126)
287-288, 294-296, 298, 363-366
src/logging.rs 100.00%
(13/13)
``
src/main.rs 45.76%
(162/354)
85-87, 89, 130-131, 141-145, 149-151, 153-154, 156-157, 177-180, 204-208, 216, 222, 225, 230-233, 238-239, 245, 251, 253-255, 257, 263-264, 270, 275, 278-279, 283, 285-286, 290-291, 293, 299, 303-304, 306-311, 313-314, 317, 326, 329-330, 333, 380-383, 390, 392-396, 399-402, 404-405, 407-408, 410, 412-418, 422, 424-427, 430, 434-436, 440, 442, 445, 449, 454-457, 463-464, 470-471, 477, 479-480, 484, 486, 491-493, 497, 500-501, 503-504, 509, 511-513, 517-518, 520, 527, 532-533, 535-540, 542-543, 547, 556, 559-560, 563, 565, 584, 591, 595-597, 599, 627-628, 636, 669, 704, 729, 733, 736-739, 795-796, 803-804, 807, 834-835, 838, 875, 896-897, 901-904, 926, 953, 962, 967, 972-973
src/metrics.rs 84.04%
(158/188)
455-460, 493-494, 552, 558, 579-582, 732-734, 736, 768, 833, 838, 881, 904, 952, 980, 984, 1005, 1007-1008, 1013
src/results.rs 56.60%
(253/447)
726, 735-737, 739-740, 743-744, 747, 769, 772-773, 776, 778, 781, 785-790, 800-801, 804-809, 826, 838-839, 841, 843, 846-847, 849, 853, 880, 904-906, 909-910, 914-916, 919, 945, 950, 955, 961, 980, 982-983, 985, 987-991, 993, 995-996, 1030, 1071-1072, 1075, 1081-1082, 1086, 1090-1092, 1094-1095, 1119-1123, 1126-1129, 1132-1141, 1151-1152, 1171-1172, 1174-1178, 1180, 1197-1198, 1200-1205, 1207, 1225, 1227-1232, 1250, 1253, 1269-1270, 1285-1287, 1289-1291, 1293-1294, 1296-1297, 1299-1300, 1302, 1304-1305, 1307-1310, 1312-1314, 1316-1318, 1321, 1325-1326, 1334-1339, 1341-1342, 1346-1347, 1351-1353, 1355, 1359-1360, 1369-1372, 1376-1378, 1382, 1384-1385, 1393-1394, 1399, 1406-1410, 1412, 1610-1611, 1831-1832, 1834-1835
src/results_blocking.rs 95.51%
(298/312)
489-490, 492-493, 544, 769, 774, 779, 815, 818-819, 827-828, 886
src/standalone_client.rs 84.57%
(636/752)
40, 68-69, 79, 84-85, 87, 96-99, 109-111, 113, 117, 133, 154, 256, 276, 320, 361, 365, 396, 414, 513, 531, 542, 549, 614, 617-618, 626-646, 648-649, 651, 675, 682, 698, 736, 739, 761-763, 768-769, 857, 877, 893, 921, 924-925, 962, 966, 997, 1001, 1015, 1022, 1105, 1123, 1134, 1141, 1144, 1201, 1204-1205, 1213-1233, 1235-1236, 1238, 1262, 1269, 1272, 1284, 1321, 1324
src/standalone_server.rs 77.97%
(400/513)
138, 161, 187, 204-205, 207, 217-219, 221, 260, 285-286, 309-311, 335-336, 421-422, 425-426, 446-447, 457-458, 461, 463, 465, 475-478, 485, 493-496, 521, 553-554, 569-570, 580-581, 584, 586, 588, 598-601, 608, 619-622, 668, 747-748, 766-768, 772-774, 824-826, 830-831, 834-835, 851-852, 859-862, 871, 876-877, 880, 882, 884, 894, 901-904, 926, 956-958, 962-963, 975-976, 983-986, 995, 1000-1001, 1004, 1006, 1008, 1018, 1027-1030
src/utils.rs 75.00%
(42/56)
143, 147-148, 153, 159, 198-202, 239-242
Total 75.26%
(4016/5336)

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Async SHM multi-server path is non-functional

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