llvm-project/lldb/test/functionalities/watchpoint/watchpoint_set_command/main.cpp

116 lines
3.1 KiB
C++

//===-- main.cpp ------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C includes
#include <pthread.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
pthread_t g_thread_1 = NULL;
pthread_t g_thread_2 = NULL;
pthread_t g_thread_3 = NULL;
char *g_char_ptr = NULL;
void
do_bad_thing_with_location(unsigned index, char *char_ptr, char new_val)
{
unsigned what = new_val;
printf("new value written to array(%p) and index(%u) = %u\n", char_ptr, index, what);
char_ptr[index] = new_val;
}
uint32_t access_pool (uint32_t flag = 0);
uint32_t
access_pool (uint32_t flag)
{
static pthread_mutex_t g_access_mutex = PTHREAD_MUTEX_INITIALIZER;
static unsigned idx = 0; // Well-behaving thread only writes into indexs from 0..6.
if (flag == 0)
::pthread_mutex_lock (&g_access_mutex);
// idx valid range is [0, 6].
if (idx > 6)
idx = 0;
if (flag != 0) {
// Write into a forbidden area.
do_bad_thing_with_location(7, g_char_ptr, 99);
}
unsigned index = idx++;
if (flag == 0)
::pthread_mutex_unlock (&g_access_mutex);
return g_char_ptr[index];
}
void *
thread_func (void *arg)
{
uint32_t thread_index = *((uint32_t *)arg);
printf ("%s (thread index = %u) startng...\n", __FUNCTION__, thread_index);
uint32_t count = 0;
uint32_t val;
while (count++ < 15)
{
// random micro second sleep from zero to 3 seconds
int usec = ::rand() % 3000000;
printf ("%s (thread = %u) doing a usleep (%d)...\n", __FUNCTION__, thread_index, usec);
::usleep (usec);
if (count < 7)
val = access_pool ();
else
val = access_pool (1);
printf ("%s (thread = %u) after usleep access_pool returns %d (count=%d)...\n", __FUNCTION__, thread_index, val, count);
}
printf ("%s (thread index = %u) exiting...\n", __FUNCTION__, thread_index);
return NULL;
}
int main (int argc, char const *argv[])
{
int err;
void *thread_result = NULL;
uint32_t thread_index_1 = 1;
uint32_t thread_index_2 = 2;
uint32_t thread_index_3 = 3;
g_char_ptr = (char *)malloc (10);
for (int i = 0; i < 10; ++i)
*g_char_ptr = 0;
// Create 3 threads
err = ::pthread_create (&g_thread_1, NULL, thread_func, &thread_index_1);
err = ::pthread_create (&g_thread_2, NULL, thread_func, &thread_index_2);
err = ::pthread_create (&g_thread_3, NULL, thread_func, &thread_index_3);
struct {
int a;
int b;
int c;
} MyAggregateDataType;
printf ("Before turning all three threads loose...\n"); // Set break point at this line.
// Join all of our threads
err = ::pthread_join (g_thread_1, &thread_result);
err = ::pthread_join (g_thread_2, &thread_result);
err = ::pthread_join (g_thread_3, &thread_result);
return 0;
}