Common configuration methods for using GDB to debug multi-threaded programs under Linux
Introduction:
In multi-threaded programming, debugging is an essential task. GDB is a powerful debugger that can help us locate and solve errors in multi-threaded programs. This article will introduce common configuration methods for using GDB to debug multi-threaded programs under Linux, and provide code examples, hoping to help readers better understand and use GDB.
1. Install GDB
First, we need to install GDB in the Linux system. Enter the following command in the terminal to complete the installation:
$ sudo apt-get install gdb
2. Compile multi-threaded program
Before debugging a multi-threaded program, we first need to write and compile a simple multi-threaded program. The following is the code of a sample program:
#include#include #define NUM_THREADS 5 void* thread_func(void* thread_id) { long tid = (long)thread_id; printf("Hello World! It's me, thread #%ld! ", tid); pthread_exit(NULL); } int main() { pthread_t threads[NUM_THREADS]; int rc; long t; for (t = 0; t < NUM_THREADS; t++) { printf("In main: creating thread %ld ", t); rc = pthread_create(&threads[t], NULL, thread_func, (void*)t); if (rc) { printf("ERROR; return code from pthread_create() is %d ", rc); return -1; } } pthread_exit(NULL); }
We save the above code to a file namedmultithread.c
and compile it using the following command:
$ gcc -g -pthread -o multithread multithread.c
Among them, the-g
option is used to add debugging information to the executable file, and the-pthread
option is used to introduce the multi-thread library.
3. Start GDB debugging
After completing the compilation, we can use GDB to start debugging. Enter the following command in the terminal:
$ gdb multithread
4. Configure GDB debugging options
In GDB, there are some debugging options that can help us better debug multi-threaded programs. We can configure it by entering the following command:
(gdb) set print thread-events off
(gdb) set backtrace limit 10
(gdb) show scheduling
(gdb) set scheduler-locking on
5. Set breakpoints and monitoring points
During the debugging process, we can set breakpoints and monitoring points to control the execution flow of the program. The following are some commonly used command examples:
(gdb) break function_name
(gdb) delete breakpoints
(gdb) watch variable_name
(gdb) delete watchpoints
6. Debugging multi-threaded programs
In GDB , we can use the following command to debug a multi-threaded program:
(gdb) run
(gdb) Ctrl+C
(gdb) info threads
(gdb) thread thread_id
(gdb) continue
7. Summary
This article introduces the common configuration methods for using GDB to debug multi-threaded programs under Linux, and Comes with code examples. By properly configuring debugging options and using corresponding commands, we can well control and locate problems in multi-threaded programs and improve debugging efficiency and accuracy. I hope this article can help readers in multi-thread debugging and inspire more learning and practice.
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