main线程阻塞，如何找到原因

发布于 2022-02-19 19:41:26 浏览：1138 订阅该版

[tocm]

ps内容如下
```
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
tshell    21  ready   0x00000200 0x00000400    50%   0x00000004 000
tidle     31  ready   0x00000044 0x00000100    32%   0x00000019 000
timer      4  suspend 0x0000005c 0x00000200    46%   0x00000002 000
main      10  suspend 0x000001f4 0x00000400    50%   0x00000003 000
```

list_sem内容如下
```
semaphor v   suspend thread
-------- --- --------------
at_rx2#  016 0
at_rx#   344 0
at_q2#   002 0
at_q#    001 0
shrx     000 0
heap     001 0
```
可能的卡住的位置，这部分来自于github, paho-mqtt例程
```
while (1)
	{
		/* handle timeouts */
		if (MQTTPacket_readnb(buf, buflen, &mytransport) == PUBLISH)
		{
			unsigned char dup;
			int qos;
			unsigned char retained;
			unsigned short msgid;
			int payloadlen_in;
			unsigned char* payload_in;
			int rc;
			MQTTString receivedTopic;

rc = MQTTDeserialize_publish(&dup, &qos, &retained, &msgid, &receivedTopic,
					&payload_in, &payloadlen_in, buf, buflen);
			rt_kprintf("message arrived %.*s\n", payloadlen_in, payload_in);
			rt_kprintf("publishing reading\n");
			len = MQTTSerialize_publish(buf, buflen, 0, 0, 0, 0, topicString, (unsigned char*)payload, payloadlen);
			rc = transport_sendPacketBuffer(mysock, buf, len);
		}

}
```