我在这里写一个C pgm，它创建一个线程并处理它。为了避免线程的内存泄漏，我正在使用pthread_cleanup_push和pthread_cleanup_pop函数，并在线程函数上最后调用pthread_exit。在运行程序时，我得到以下错误。
我相信有一些内存分配/免费问题。请帮帮我，如何在没有内存泄漏的情况下安全地终止线程。以下是我的计划： -
struct str_thrd_data
{
SQLHANDLE hstmt;
int rc;
bool thrd_completed_flag;
};
void * str_in_thread_call(void *in_str_arg)
{
int thrd_rc;
struct str_thrd_data *str_arg;
str_arg = in_str_arg;
pthread_cleanup_push(free, str_arg);
thrd_rc = pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
if (thrd_rc != 0)
handle_error_en(thrd_rc, "pthread_setcancelstate");
thrd_rc = pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
if (thrd_rc != 0)
handle_error_en(thrd_rc, "pthread_setcancelstate");
printf("\n*********************Normal Thread termination withing timelimit %d\n",str_arg->rc);
str_arg->thrd_completed_flag = true;
sleep(1);
pthread_cleanup_pop(1);
pthread_exit(1);
}
int main()
{
printf("\nPJH: New THread created.\n");
pthread_attr_t tattr;
pthread_t th;
size_t mysize = 1;
struct str_thrd_data atd;
atd.hstmt = hstmt;
atd.rc= rc;
atd.thrd_completed_flag = false;
thrd_rc = pthread_attr_init(&tattr);
thrd_rc = pthread_attr_setstacksize(&tattr, mysize);
thrd_rc = pthread_create(&th, &tattr, &str_in_thread_call, &atd);
if (thrd_rc != 0)
handle_error_en(thrd_rc, "pthread_create");
while(timeout !=0)
{
printf("%d Value of rc=%d\n",timeout, atd.rc);
if(atd.rc != 999) break;
timeout--;
usleep(10000);
}
rc = atd.rc;
}
以下是我在运行程序时收到的错误消息： -
*** glibc detected *** ./myprocessname: free(): invalid pointer: 0xbc8d9f34 ***
======= Backtrace: =========
/lib/libc.so.6[0x5e0c65]
/lib/libc.so.6(cfree+0x59)[0x5e4c59]
./dcs[0x80a828a]
/lib/libpthread.so.0[0x7c4912]
/lib/libc.so.6(clone+0x5e)[0x64c60e]
======= Memory map: ========
00558000-00573000 r-xp 00000000 fd:00 393227 /lib/ld-2.5.so
00573000-00574000 r--p 0001a000 fd:00 393227 /lib/ld-2.5.so
00574000-00575000 rw-p 0001b000 fd:00 393227 /lib/ld-2.5.so
00577000-006ce000 r-xp 00000000 fd:00 393228 /lib/libc-2.5.so
006ce000-006d0000 r--p 00156000 fd:00 393228 /lib/libc-2.5.so
006d0000-006d1000 rw-p 00158000 fd:00 393228 /lib/libc-2.5.so
006d1000-006d4000 rw-p 006d1000 00:00 0
006d6000-006fd000 r-xp 00000000 fd:00 393234 /lib/libm-2.5.so
006fd000-006fe000 r--p 00026000 fd:00 393234 /lib/libm-2.5.so
006fe000-006ff000 rw-p 00027000 fd:00 393234 /lib/libm-2.5.so
007a1000-007a8000 r-xp 00000000 fd:00 393417 /lib/librt-2.5.so
007a8000-007a9000 r--p 00007000 fd:00 393417 /lib/librt-2.5.so
007a9000-007aa000 rw-p 00008000 fd:00 393417 /lib/librt-2.5.so
007bf000-007d5000 r-xp 00000000 fd:00 393230 /lib/libpthread-2.5.so
007d5000-007d6000 r--p 00015000 fd:00 393230 /lib/libpthread-2.5.so
007d6000-007d7000 rw-p 00016000 fd:00 393230 /lib/libpthread-2.5.so
007d7000-007d9000 rw-p 007d7000 00:00 0
007db000-007e6000 r-xp 00000000 fd:00 393252 /lib/libgcc_s-4.1.20080825.so.1
007e6000-007e7000 rw-p 0000a000 fd:00 393252 /lib/libgcc_s-4.1.2-20080825.so.1
007e9000-007ec000 r-xp 00000000 fd:00 393237 /lib/libdl-2.5.so
007ec000-007ed000 r--p 00002000 fd:00 393237 /lib/libdl-2.5.so
007ed000-007ee000 rw-p 00003000 fd:00 393237 /lib/libdl-2.5.so
00acd000-00adf000 r-xp 00000000 fd:00 393296 /lib/libz.so.1.2.3
00adf000-00ae0000 rw-p 00011000 fd:00 393296 /lib/libz.so.1.2.3
08048000-0810c000 r-xp 00000000 fd:01 1517776 /home/myprocessname
0810c000-08185000 rw-p 000c3000 fd:01 1517776 /home/myprocessname
08185000-08215000 rw-p 08185000 00:00 0
0857b000-08aee000 rw-p 0857b000 00:00 0 [heap]
1ffea000-1ffeb000 ---p 1ffea000 00:00 0
1ffeb000-3f3eb000 rwxp 1ffeb000 00:00 0
3f3eb000-3f42c000 rw-p 3f3eb000 00:00 0
3f42c000-3f44c000 rw-s 00000000 00:09 1570996267 /SYSV00000000 (deleted)
3f44c000-3f48c000 rw-p 3f44c000 00:00 0
3f48c000-3f4ac000 rw-s 00000000 00:09 1570963498 /SYSV00000000 (deleted)
3f4ac000-3f4cc000 rw-s 00000000 00:09 1570930729 /SYSV00000000 (deleted)
3f4cc000-3f58c000 rw-p 3f4cc000 00:00 0
3f58c000-3f5ac000 rw-s 00000000 00:09 1570897960 /SYSV00000000 (deleted)
3f5ac000-3f62c000 rw-p 3f5ac000 00:00 0
3f62c000-3f64c000 rw-s 00000000 00:09 1570865191 /SYSV00000000 (deleted)
3f64c000-3f6cc000 rw-p 3f64c000 00:00 0
3f6cc000-3f6ec000 rw-s 00000000 00:09 1570832422 /SYSV00000000 (deleted)
3f6ec000-3f70c000 rw-s 00000000 00:09 1570799653 /SYSV00000000 (deleted)
3f70c000-3f72c000 rw-s 00000000 00:09 1570766884 /SYSV00000000 (deleted)
3f72c000-3f8ec000 rw-p 3f72c000 00:00 0
3f8ec000-3f8ed000 ---p 3f8ec000 00:00 0
3f8ed000-5eced000 rwxp 3f8ed000 00:00 0
5eced000-5ecee000 ---p 5eced000 00:00 0
5ecee000-7e0ee000 rwxp 5ecee000 00:00 0Aborted (core dumped)
答案 0 :(得分：2)
您正在尝试释放main功能的堆栈内存。这当然行不通。
在您使用pthread_create的{{1}}调用中，这将返回指向&atd函数堆栈上atd结构的指针。这个记忆不能也不应该被你释放。
答案 1 :(得分：1)
上述代码的另一个问题是thrd_rc = pthread_attr_setstacksize(&tattr, mysize);此mysize应该是系统页面大小的倍数，否则函数将失败。