1 //===-- main.cpp ------------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // This test is intended to create a situation in which two threads are stopped 11 // at a breakpoint and the debugger issues a step-out command. 12 13 #include <pthread.h> 14 #include <atomic> 15 16 // Note that although hogging the CPU while waiting for a variable to change 17 // would be terrible in production code, it's great for testing since it 18 // avoids a lot of messy context switching to get multiple threads synchronized. 19 #define do_nothing() 20 21 #define pseudo_barrier_wait(bar) \ 22 --bar; \ 23 while (bar > 0) \ 24 do_nothing(); 25 26 #define pseudo_barrier_init(bar, count) (bar = count) 27 28 std::atomic_int g_barrier; 29 30 volatile int g_test = 0; 31 32 void step_out_of_here() { 33 g_test += 5; // Set breakpoint here 34 } 35 36 void * 37 thread_func (void *input) 38 { 39 // Wait until both threads are running 40 pseudo_barrier_wait(g_barrier); 41 42 // Do something 43 step_out_of_here(); // Expect to stop here after step-out (clang) 44 45 // Return 46 return NULL; // Expect to stop here after step-out (icc and gcc) 47 } 48 49 int main () 50 { 51 pthread_t thread_1; 52 pthread_t thread_2; 53 54 // Don't let either thread do anything until they're both ready. 55 pseudo_barrier_init(g_barrier, 2); 56 57 // Create two threads 58 pthread_create (&thread_1, NULL, thread_func, NULL); 59 pthread_create (&thread_2, NULL, thread_func, NULL); 60 61 // Wait for the threads to finish 62 pthread_join(thread_1, NULL); 63 pthread_join(thread_2, NULL); 64 65 return 0; 66 } 67
