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 // C includes 11 #include <pthread.h> 12 #include <stdio.h> 13 #include <stdint.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 17 pthread_t g_thread_1 = NULL; 18 pthread_t g_thread_2 = NULL; 19 pthread_t g_thread_3 = NULL; 20 21 uint32_t g_val = 0; 22 23 uint32_t access_pool (uint32_t flag = 0); 24 25 uint32_t 26 access_pool (uint32_t flag) 27 { 28 static pthread_mutex_t g_access_mutex = PTHREAD_MUTEX_INITIALIZER; 29 if (flag == 0) 30 ::pthread_mutex_lock (&g_access_mutex); 31 32 uint32_t old_val = g_val; 33 if (flag != 0) 34 g_val = old_val + 1; 35 36 if (flag == 0) 37 ::pthread_mutex_unlock (&g_access_mutex); 38 return g_val; 39 } 40 41 void * 42 thread_func (void *arg) 43 { 44 uint32_t thread_index = *((uint32_t *)arg); // Break here to test that the stop-hook mechanism works for multiple threads. 45 printf ("%s (thread index = %u) startng...\n", __FUNCTION__, thread_index); 46 47 uint32_t count = 0; 48 uint32_t val; 49 while (count++ < 15) 50 { 51 // random micro second sleep from zero to 3 seconds 52 int usec = ::rand() % 3000000; 53 printf ("%s (thread = %u) doing a usleep (%d)...\n", __FUNCTION__, thread_index, usec); 54 ::usleep (usec); 55 56 if (count < 7) 57 val = access_pool (); 58 else 59 val = access_pool (1); 60 61 printf ("%s (thread = %u) after usleep access_pool returns %d (count=%d)...\n", __FUNCTION__, thread_index, val, count); 62 } 63 printf ("%s (thread index = %u) exiting...\n", __FUNCTION__, thread_index); 64 return NULL; 65 } 66 67 68 int main (int argc, char const *argv[]) 69 { 70 int err; 71 void *thread_result = NULL; 72 uint32_t thread_index_1 = 1; 73 uint32_t thread_index_2 = 2; 74 uint32_t thread_index_3 = 3; 75 76 printf ("Before turning all three threads loose...\n"); // Set break point at this line, and add a stop-hook. 77 // Create 3 threads 78 err = ::pthread_create (&g_thread_1, NULL, thread_func, &thread_index_1); 79 err = ::pthread_create (&g_thread_2, NULL, thread_func, &thread_index_2); 80 err = ::pthread_create (&g_thread_3, NULL, thread_func, &thread_index_3); 81 82 // Join all of our threads 83 err = ::pthread_join (g_thread_1, &thread_result); 84 err = ::pthread_join (g_thread_2, &thread_result); 85 err = ::pthread_join (g_thread_3, &thread_result); 86 87 return 0; 88 } 89
