GDB debugging OpenMP Multi-threaded Routines Sample Introduction

First, a simple program source code:

  1 #include <stdio.h>  2 #include <stdlib.h>  3 #include <omp.h>  4 int main (int argc, char * ar Gv[]) {  5   int i, k,m,n;  6   printf ("i=%d,threads_num=%d\n", I, Omp_get_num_threads ());  7   printf ("i=%d,thread_id=%d\n", I, Omp_get_thread_num ());  8 #pragma omp parallel for  9 for (i=0;i<4;i++) Ten {one    k=10;    m=10;    n=k+m;    printf ("i=% D,n=%d,thread_id=%d\n ", I,n, Omp_get_thread_num ());    if (k>1)    printf ("ok\n"); +    1; 19}

Compile into Test_omp

Step 1:gdb Test_omp

Step 2:break 15

Step 3:run

(GDB) rstarting program:/home/xqc/gmptest/test_omp [Thread Debugging using libthread_db enabled]i=0,threads_num=1i=0, Thread_id=0[new thread 0x7ffff740f700 (LWP 17108)][new thread 0x7ffff6c0e700 (LWP 17109)][new thread 0x7ffff640d700 (LWP 1 7110)]breakpoint 1, main.omp_fn.0 (. omp_data_i=0x7fffffffe3b0) at test_omp.c:1515         k=10; (gdb)

(GDB) Info Threads  4 Thread 0x7ffff640d700 (LWP 17110)  main.omp_fn.0 (. omp_data_i=0x7fffffffe3b0) at Test_omp.c :  3 Thread 0x7ffff6c0e700 (LWP 17109)  main.omp_fn.0 (. omp_data_i=0x7fffffffe3b0) at Test_omp.c:15  2 Thread 0x7ffff740f700 (LWP 17108)  main.omp_fn.0 (. omp_data_i=0x7fffffffe3b0) at test_omp.c:15* 1 Thread 0x7ffff7fdf780 (LWP 17105)  

Step4:thread 2

(GDB) thread 2[switching to thread 2 (thread 0x7ffff740f700 (LWP 17108))] #0  main.omp_fn.0 (. omp_data_i= 0x7fffffffe3b0) at    test_omp.c:1515         

At this point, you can debug the thread Line 2 line.