C++ std::map clear()中崩溃-多线程
我在多线程应用程序中面临一个奇怪的崩溃:C++ std::map clear()中崩溃-多线程,c++,multithreading,crash,mutex,stdmap,C++,Multithreading,Crash,Mutex,Stdmap,我在多线程应用程序中面临一个奇怪的崩溃: static std::map<int, std::string> g_params; Thread 1 (void)lock(map_mutex); g_params[iParamID] = sValue; (void)unlock(map_mutex); Thread 2 (void)lock(map_mutex); std::map<int, std::string>::itera
static std::map<int, std::string> g_params;
Thread 1
(void)lock(map_mutex);
g_params[iParamID] = sValue;
(void)unlock(map_mutex);
Thread 2
(void)lock(map_mutex);
std::map<int, std::string>::iterator it;
for (it = g_params.begin(); it != g_params.end(); ++it)
{
// process it->first and it->second, w/o modifying them
}
g_params.clear(); // the crash occurs here: #5 0x76a3d08c in *__GI___libc_free (mem=0x703070c8) at malloc.c:3672
//#14 std::map<int, std::string, std::less<int>, std::allocator<std::pair<int const, std::string> > >::clear (this=0xb4b060)
(void)unlock(map_mutex);
这次坠机事件非常罕见,很难预测一个情景来重现它。互斥体应该保证映射不会从一个线程更改到另一个线程,对吗?我猜您是在复制互斥体,这可能会阻止它作为一个线程工作。尝试使用指针:
int lock(pthread_mutex_t* mutex)
{
return pthread_mutex_lock(mutex);
}
int unlock(pthread_mutex_t* mutex)
{
return pthread_mutex_unlock(mutex);
}
编辑
或者,参考文献似乎也会起作用:
int lock(pthread_mutex_t& mutex)
{
return pthread_mutex_lock(&mutex);
}
int unlock(pthread_mutex_t& mutex)
{
return pthread_mutex_unlock(&mutex);
}
您通过值传递,并获取临时地址。那不太好。。。
int lock(pthread_mutex_t& mutex)
{
return pthread_mutex_lock(&mutex);
}
int unlock(pthread_mutex_t& mutex)
{
return pthread_mutex_unlock(&mutex);
}