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。
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:
xcode-select --install
。没有这样做我无法建立
Valgrind的。 CC
和CXX
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。./configure --prefix=/usr/local
了
Valgrind tarball,然后是make
和sudo make install
。希望这些步骤可以帮助您解决问题。