Attachment 146158 Details for Bug 192918 – Test case

Test case

umtx_suspend.c (text/x-c), 1.69 KB, created by eric on 2014-08-22 15:10:32 UTC

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Creator: eric

Created: 2014-08-22 15:10:32 UTC

Size: 1.69 KB

patch

obsolete

>// cc -lpthread -o umtx_suspend umtx_suspend.c
>//
>// failure: a thread spins around "umtxpi" the kernel, ignoring signals
>// success: the process exits
>
>#include <sys/cdefs.h>
>
>#include <err.h>
>#include <pthread.h>
>#include <pthread_np.h>
>#include <stdio.h>
>#include <unistd.h>
>
>pthread_mutex_t the_mutex;
>
>void *
>spinning_thread_func(void *arg __unused)
>{
>    int error;
>
>    error = pthread_mutex_lock(&the_mutex);
>    if (error)
>        errc(1, error, "%s: pthread_mutex_lock", __func__);
>
>    return (NULL);
>}
>
>int
>main(int argc __unused, char *argv[] __unused)
>{
>    int error;
>    pthread_t spinning_thread;
>    pthread_mutexattr_t the_mutex_attr;
>
>    error = pthread_mutexattr_init(&the_mutex_attr);
>    if (error)
>        errc(1, error, "pthread_mutexattr_init");
>
>    error = pthread_mutexattr_setprotocol(&the_mutex_attr, PTHREAD_PRIO_INHERIT);
>    if (error)
>        errc(1, error, "pthread_mutexattr_setprotocol");
>
>    error = pthread_mutex_init(&the_mutex, &the_mutex_attr);
>    if (error)
>        errc(1, error, "pthread_mutex_init");
>
>    error = pthread_mutex_lock(&the_mutex);
>    if (error)
>        errc(1, error, "pthread_mutex_lock");
>
>    error = pthread_create(&spinning_thread, NULL, spinning_thread_func, NULL);
>    if (error)
>        errc(1, error, "pthread_create");
>
>    // Wait for the spinning_thread to call pthread_mutex_lock(3)
>    // and enter the kernel.
>    (void) sleep(1);
>
>    error = pthread_suspend_np(spinning_thread);
>    if (error)
>        errc(1, error, "pthread_suspend_np");
>
>    // The spinning_thread should be spinning in the kernel.
>    // This thread should be blocked in pthread_suspend_np(3).
>    fputs("This test failed to reproduce the bug.\n", stderr);
>
>    return (0);
>}

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Attachments on bug 192918: 146158 | 146159