[Bug gcov-profile/49484] gcov crash if two(or more) forks happen at the same time

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49484

--- Comment #14 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-12 
14:23:32 UTC ---
Author: rguenth
Date: Mon Mar 12 14:23:27 2012
New Revision: 185231

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185231
Log:
2012-03-12  Richard Guenther  <rguent...@suse.de>

    * gthr.h (__GTHREAD_MUTEX_INIT_FUNCTION): Adjust specification.
    * gthr-posix.h (__GTHREAD_MUTEX_INIT_FUNCTION): Define.
    (__gthread_mutex_init_function): New function.
    * gthr-single.h (__GTHREAD_MUTEX_INIT_FUNCTION): Define.

    PR gcov/49484
    * libgcov.c: Include gthr.h.
    (__gcov_flush_mx): New global variable.
    (init_mx, init_mx_once): New functions.
    (__gcov_flush): Protect self with a mutex.
    (__gcov_fork): Re-initialize mutex after forking.
    * unwind-dw2-fde.c: Change condition under which to use
    __GTHREAD_MUTEX_INIT_FUNCTION.

Modified:
    trunk/libgcc/ChangeLog
    trunk/libgcc/gthr-posix.h
    trunk/libgcc/gthr-single.h
    trunk/libgcc/gthr.h
    trunk/libgcc/libgcov.c
    trunk/libgcc/unwind-dw2-fde.c