pthread_join总是导致SIGSEGV

时间:2016-02-24 02:37:21

标签: c pthreads pthread-join

出于某种原因,当我使用Valgrind运行时,pthread_join总是在我的计算机上导致SIGSEGV操作。为了测试这一点,我从https://computing.llnl.gov/tutorials/pthreads/运行了以下代码:

/* pthread.c */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define NUM_THREADS 4

void *BusyWork(void *t)
{
  int i;
  long tid;
  double result=0.0;
  tid = (long)t;
  printf("Thread %ld starting...\n",tid);
  for (i=0; i<1000000; i++)
  {
    result = result + sin(i) * tan(i);

  }
  printf("Thread %ld done. Result = %e\n",tid, result);
  pthread_exit((void*) t);

}

int main (int argc, char *argv[])
{
  pthread_t thread[NUM_THREADS];
  pthread_attr_t attr;
  int rc;
  long t;
  void *status;

  /* Initialize and set thread detached attribute */
  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

  for(t=0; t<NUM_THREADS; t++) {
    printf("Main: creating thread %ld\n", t);
    rc = pthread_create(&thread[t], &attr, BusyWork, (void *)t); 
    if (rc) {
      printf("ERROR; return code from pthread_create() is %d\n", rc);
      exit(-1);

    }

  }

  /* Free attribute and wait for the other threads */
  pthread_attr_destroy(&attr);
  for(t=0; t<NUM_THREADS; t++) {
    rc = pthread_join(thread[t], &status);
    if (rc) {
      printf("ERROR; return code from pthread_join() is %d\n", rc);
      exit(-1);

    }
    printf("Main: completed join with thread %ld having a status   of %ld\n",
        t,(long)status);

  }

  printf("Main: program completed. Exiting.\n");
  pthread_exit(NULL);
}

正在运行

$ clang -g -o pthread pthread.c
$ valgrind --leak-check=full ./pthread

产生以下valgrind错误:

==17283== Process terminating with default action of signal 11 (SIGSEGV)
==17283==  Access not within mapped region at address 0x700002F3CC3E
==17283==    at 0x10044437F: _pthread_find_thread (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100446D52: _pthread_join_cleanup (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100446C63: pthread_join (in /usr/lib/system/libsystem_pthread.dylib)
==17283==    by 0x100000D52: main (pthread.c:50)

我的电脑是Mac OS X(El Capitan)。对于clang,我使用的是Apple LLVM版本7.0.2(clang-700.1.81)。对于Valgrind,我使用的是valgrind-3.11.0。

1 个答案:

答案 0 :(得分:1)

我无法在内核14.5.0的Mac OS X Yosemite(10.10.5)上重现您的问题。我使用的Clang和Valgrind版本与您的相同(请仔细检查以防万一):

$ clang --version
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

$ valgrind --version
valgrind-3.11.0

因此唯一的区别是操作系统版本。以下是我遵循的步骤:

  1. 通过运行刷新开发人员工具的安装 xcode-select --install。没有这样做我无法建立 Valgrind的。
  2. CCCXX环境变量设置为clang和 分别为clang++。我这样做是为了确保Clang,而不是GCC, 用来。设置CXX可能有点过头了。我后来消灭了Valgrind的安装并重新做了 与海湾合作委员会,但它仍然是成功的,即使我认为我是 获得更多警告。
  3. 在{unt}的根目录中./configure --prefix=/usr/local了 Valgrind tarball,然后是makesudo make install
  4. 希望这些步骤可以帮助您解决问题。