Program Crash debug record and summary

1. Multi-threaded access to shared resources is not locked

Error Tip: Segmentation fault!
Workaround:

• Multi-threaded read no need to lock
• Multi-threaded simultaneous read and write requires lock
  The method of locking is the event notification mechanism provided by the combination of mutex, semaphore, read-write lock, record lock, mutex and condition variable.
  C++11, Lock_guard,unique_lock. Both are locked at the time of construction, and when the destruction is locked. But Unique_lock provides more features, such as the ability to specify that it is not locked at construction time, and then called when needed. Lock () lock. If combined with condition_variable, use only unqiue_lock.

2. The pointer variable is not initialized to nullptr at the time of definition, or at some point execution becomes a dangling pointer, causing unpredictable errors.

Error tip: Segmentaion fault!
Workaround:

• Pointer variables are initialized to nullptr at the time of declaration, and when used to determine if (!PTR)
• Check the code carefully to avoid hanging hands.

3. Std::thread in joinalble state causes terminate

Error message: Terminate called without an active exception. Aborted
Workaround:

• Call detach to detach thread when creating thread
• Call join after thread executes to wait for thread to end normally
  However, after writing a lot of code, sometimes in a code branch prematurely exit and cause thread destruction without running to the join statement, which will lead to terminate;
  The sample code is as follows:

2. void foo()
4. {
6. //do something;
8. }
12. int main()
14. {
16. std::thread t(foo);
18. if(true)return1;
20. t.join();
22. return0;
24. }

Code 8 o'clock T constructs and runs with Foo, this is for the joinable state, the Code 9 o'clock program exits, causing T to be refactored before T.join (), and thread will cause terminate under joinable state destruction. The ~thread function is described in Cplusplus as follows:
If the thread is joinable -Destroyed, terminate () is called.

From for notes (Wiz)

Program crashes debug logging and summary