取消调用pthread_cond_wait（）与PRIO_INHERIT互斥挂起(Cancellin

更新4/10 2012： 由libc的补丁修复

我在取消线程的问题pthread_cond_wait ，使用互斥与PTHREAD_PRIO_INHERIT设置属性。这只是发生在某些平台上虽然。

以下最小示例演示此：（与编译g++ <filename>.cpp -lpthread ）

#include <pthread.h>
#include <iostream>

pthread_mutex_t mutex;
pthread_cond_t cond;

void clean(void *arg) {
    std::cout << "clean: Unlocking mutex..." << std::endl;
    pthread_mutex_unlock((pthread_mutex_t*)arg);
    std::cout << "clean: Mutex unlocked..." << std::endl;
}

void *threadFunc(void *arg) {
    int ret = 0;
    pthread_mutexattr_t mutexAttr;
    ret = pthread_mutexattr_init(&mutexAttr); std::cout << "ret = " << ret << std::endl;

    //Comment out the following line, and everything works
    ret = pthread_mutexattr_setprotocol(&mutexAttr, PTHREAD_PRIO_INHERIT); std::cout << "ret = " << ret << std::endl;

    ret = pthread_mutex_init(&mutex, &mutexAttr); std::cout << "ret = " << ret << std::endl;
    ret = pthread_cond_init(&cond, 0); std::cout << "ret = " << ret << std::endl;

    std::cout << "threadFunc: Init done, entering wait..." << std::endl;

    pthread_cleanup_push(clean, (void *) &mutex);
    ret = pthread_mutex_lock(&mutex); std::cout << "ret = " << ret << std::endl;
    while(1) {
        ret = pthread_cond_wait(&cond, &mutex); std::cout << "ret = " << ret << std::endl;
    }
    pthread_cleanup_pop(1);

    return 0;
}

int main() {
    pthread_t thread;
    int ret = 0;
    ret = pthread_create(&thread, 0, threadFunc, 0); std::cout << "ret = " << ret << std::endl;

    std::cout << "main: Thread created, waiting a bit..." << std::endl;
    sleep(2);

    std::cout << "main: Cancelling threadFunc..." << std::endl;
    ret = pthread_cancel(thread); std::cout << "ret = " << ret << std::endl;

    std::cout << "main: Joining threadFunc..." << std::endl;
    ret = pthread_join(thread, NULL); std::cout << "ret = " << ret << std::endl;

    std::cout << "main: Joined threadFunc, done!" << std::endl;
    return 0;
}

我每次运行它， main()挂在pthread_join() 一个GDB回溯显示以下内容：

Thread 2 (Thread 0xb7d15b70 (LWP 257)):
#0  0xb7fde430 in __kernel_vsyscall ()
#1  0xb7fcf362 in __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:142
#2  0xb7fcc9f9 in __condvar_w_cleanup () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:434
#3  0x08048fbe in threadFunc (arg=0x0) at /home/pthread_cond_wait.cpp:22
#4  0xb7fc8ca0 in start_thread (arg=0xb7d15b70) at pthread_create.c:301
#5  0xb7de73ae in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7d166d0 (LWP 254)):
#0  0xb7fde430 in __kernel_vsyscall ()
#1  0xb7fc9d64 in pthread_join (threadid=3083950960, thread_return=0x0) at pthread_join.c:89
#2  0x0804914a in main () at /home/pthread_cond_wait.cpp:41

如果PTHREAD_PRIO_INHERIT对互斥没有设置，一切正常，因为它应该，程序干净地退出。

平台与问题：

嵌入的AMD Fusion板，运行一个PTXDist基于32位Linux 3.2.9-RT16（带RTpatch 16）。我们使用最新的OSELAS i686的交叉工具链（2011年11月1日），使用gcc 4.6.2，glibc的2.14.1，binutils的2.21.1a，内核2.6.39。
相同的电路板与2011年3月1日的工具链也（GCC 4.5.2 / glibc的2.13 / 2.18的binutils /内核2.6.36）。

平台，没有任何问题：

我们自己的ARM板，还运行一个PTXDist的Linux（32位2.6.29.6-RT23），采用OSELAS臂-4T版交叉工具链（1.99.3）用gcc 4.3.2 / glibc的2.8 / 2.18的binutils /内核2.6.27 。
我的笔记本电脑（英特尔酷睿i7），运行64位的Ubuntu 11.04（虚拟化/内核2.6.38.15，通用），GCC 4.5.2 / eglibc 2.13-0ubuntu13.1 / binutils的2.21.0.20110327。

我一直在寻找周围的净解决办法，和所遇到的，我已经尝试了几个补丁，但没有任何效果：