1 // Copyright (c) 2010, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 // 30 // Helper program for the linux_dumper class, which creates a bunch of 31 // threads. The first word of each thread's stack is set to the thread 32 // id. 33 34 #include <pthread.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <sys/syscall.h> 39 #include <unistd.h> 40 41 #include "common/scoped_ptr.h" 42 #include "third_party/lss/linux_syscall_support.h" 43 44 #if defined(__ARM_EABI__) 45 #define TID_PTR_REGISTER "r3" 46 #elif defined(__aarch64__) 47 #define TID_PTR_REGISTER "x3" 48 #elif defined(__i386) 49 #define TID_PTR_REGISTER "ecx" 50 #elif defined(__x86_64) 51 #define TID_PTR_REGISTER "rcx" 52 #elif defined(__mips__) 53 #define TID_PTR_REGISTER "$1" 54 #else 55 #error This test has not been ported to this platform. 56 #endif 57 58 void *thread_function(void *data) { 59 int pipefd = *static_cast<int *>(data); 60 volatile pid_t thread_id = syscall(__NR_gettid); 61 // Signal parent that a thread has started. 62 uint8_t byte = 1; 63 if (write(pipefd, &byte, sizeof(byte)) != sizeof(byte)) { 64 perror("ERROR: parent notification failed"); 65 return NULL; 66 } 67 register volatile pid_t *thread_id_ptr asm(TID_PTR_REGISTER) = &thread_id; 68 while (true) 69 asm volatile ("" : : "r" (thread_id_ptr)); 70 return NULL; 71 } 72 73 int main(int argc, char *argv[]) { 74 if (argc < 3) { 75 fprintf(stderr, 76 "usage: linux_dumper_unittest_helper <pipe fd> <# of threads>\n"); 77 return 1; 78 } 79 int pipefd = atoi(argv[1]); 80 int num_threads = atoi(argv[2]); 81 if (num_threads < 1) { 82 fprintf(stderr, "ERROR: number of threads is 0"); 83 return 1; 84 } 85 google_breakpad::scoped_array<pthread_t> threads(new pthread_t[num_threads]); 86 pthread_attr_t thread_attributes; 87 pthread_attr_init(&thread_attributes); 88 pthread_attr_setdetachstate(&thread_attributes, PTHREAD_CREATE_DETACHED); 89 for (int i = 1; i < num_threads; i++) { 90 pthread_create(&threads[i], &thread_attributes, &thread_function, &pipefd); 91 } 92 thread_function(&pipefd); 93 return 0; 94 } 95
