做发包业务网站,导航网站怎么赚钱,出入兰州最新通知今天,wordpress导航栏小图标C/C函数调用栈信息输出#xff08;backtrace backtrace_symbols#xff09;
最近工作#xff0c;搞了一个死锁问题#xff0c;加了好多输出无法定位问题。 就想着在锁操作调用的地方输出函数调用栈信息#xff0c;试了一下#xff0c;竟然实现了。
源代码
#incl…C/C函数调用栈信息输出backtrace backtrace_symbols
最近工作搞了一个死锁问题加了好多输出无法定位问题。 就想着在锁操作调用的地方输出函数调用栈信息试了一下竟然实现了。
源代码
#include iostream
#include mutex
#include execinfo.h#ifndef __STL_LOCKER_H__
#define __STL_LOCKER_H__namespace STL
{class STL_Locker{public:static std::string printStackTrace(){std::string ret ;void *callstack[128];int frames backtrace(callstack, sizeof(callstack) / sizeof(callstack[0]));char **strs backtrace_symbols(callstack, frames);if (strs NULL){return ret;}// 从1开始是不输出最后一层printStackTrace函数的调用信息for (int i 1; i frames; i){ret.append(std::string(strs[i]));ret.append(\n);}free(strs);return ret;}public:STL_Locker(){std::cout LYLOG StackTrace:\n printStackTrace();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () INIT LOCK std::hex _mutex;}~STL_Locker(){std::cout LYLOG StackTrace:\n printStackTrace();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () DESTROY LOCK std::hex _mutex;}void lock(){std::cout LYLOG StackTrace:\n printStackTrace();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () START WRLOCK std::hex _mutex;_mutex.lock();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () ENDED WRLOCK std::hex _mutex;}void unlock(){std::cout LYLOG StackTrace:\n printStackTrace();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () START UNLOCK std::hex _mutex;_mutex.unlock();std::cout LYLOG[ __FILE__ : __LINE__ ] __FUNCTION__ () ENDED UNLOCK std::hex _mutex;}private:std::mutex _mutex;};}#endif //__STL_LOCKER_H__编译配置
如果不加次编译flags只能输出函数地址无法看到函数名称
set(CMAKE_C_FLAGS ${CMAKE_C_FLAGS} -rdynamic)
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} -rdynamic)最终效果
StackTrace:
bin/ConfigService(_ZN3tbb6Locker6unlockEv0x68) [0x556f47bb84]
bin/ConfigService(_ZN3tbb19concurrent_hash_mapINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESt10shared_ptrI16VgAccessDetecterESt4hashIS6_ESt8equal_toIS6_ESaISt4pairIKS6_S9_EEE8AccessorINSt8__detail20_Node_const_iteratorISG_Lb0ELb1EEEED1Ev0x28) [0x556f4c652c]
bin/ConfigService(_ZN8VgAccess9heartbeatERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES7_PKN2vg6access16HeartbeatRequestEPNS9_17HeartbeatResponseE0x57c) [0x556f4c2b34]
bin/ConfigService(_ZN8VgAccess9HeartbeatEPN6google8protobuf13RpcControllerEPKN2vg6access16HeartbeatRequestEPNS5_17HeartbeatResponseEPNS1_7ClosureE0x134) [0x556f4beac8]
/ConfigService/libs/libvg_pb.so(_ZN2vg6access19AccessNotifyService10CallMethodEPKN6google8protobuf16MethodDescriptorEPNS3_13RpcControllerEPKNS3_7MessageEPS9_PNS3_7ClosureE0x104) [0x7f8fdeb028]
/ConfigService/libs/libbrpc.so(_ZN4brpc6policy17ProcessRpcRequestEPNS_16InputMessageBaseE0xad0) [0x7f8ecdd724]
/ConfigService/libs/libbrpc.so(_ZN4brpc19ProcessInputMessageEPv0x10) [0x7f8eccb7d0]
/ConfigService/libs/libbrpc.so(_ZN4brpc14InputMessenger13OnNewMessagesEPNS_6SocketE0x4c0) [0x7f8eccc520]
/ConfigService/libs/libbrpc.so(_ZN4brpc6Socket12ProcessEventEPv0x18) [0x7f8ed80c88]
/ConfigService/libs/libbrpc.so(_ZN7bthread9TaskGroup11task_runnerEl0x94) [0x7f8ec24e08]
/ConfigService/libs/libbrpc.so(bthread_make_fcontext0x18) [0x7f8ec0f350]
LYLOG[/home/work/ConfigService/src/common/concurrent_hash_map.h:60] unlock() START UNLOCK 0x55a9e9baa0
LYLOG[/home/work/ConfigService/src/common/concurrent_hash_map.h:63] unlock() ENDED UNLOCK 0x55a9e9baa0这里面的函数名称是Name Mangling后的结果不懂Name Mangling的自行百度。 似乎有方法获取到原始函数名称但是定位问题这种级别的输出已经足够了没有再继续研究。
注意
次代码为了定位问题定为完问题就删掉了。产品环境下慎用。
