consumer 28204 exit\n", 20) = 20
task.28205 生产者进程
write(1, "producer begin:\n", 16) = 16
/*向队列中放入任务*/
msgsnd...(7176192, {2, "{\"data\":0}"}, 10, 0) = 0
msgsnd(7176192, {2, "{\"data\":1}"}, 10, 0) = 0
msgsnd(7176192..., {2, "{\"data\":2}"}, 10, 0) = 0
msgsnd(7176192, {2, "{\"data\":3}"}, 10, 0) = 0
msgsnd(7176192, {2,..."{\"data\":4}"}, 10, 0) = 0
/*放入完成标识*/
msgsnd(7176192, {1, "ALLDONE"}, 7, 0) = 0
/*标签队列长度*/
msgctl(7176192