add thread safety queue
add periodical threads for get perf data from xenserver
finish function peroidical_10m; add error message print when execute python script; use strip() to strip content
fix memory leaking bug
fix bug in memory leaking, may be problem not solved...
注释Pyhon C API，标示出borrowed ref和new ref，并增加Py_DecRef
remove set NUL in memory block
remove unused variables
remove debug printf
remove redifined macros
修正head_data和write_data函数返回类型和参数的类型，使用size_t代替int
fix bug in strlen
完善定期执行的函数；在virtual_hosts表中增加根据type的查询
修复hosts指针BUG；增加忽略SIGALRM信号
修复curl关于signal的BUG
修复更新virtual_host表的BUG
完善周期执行函数
减少PyEval_CallObject返回的引用计数
add note for convert function