From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2432 invoked by alias); 18 Jan 2012 14:21:25 -0000 Received: (qmail 2421 invoked by uid 22791); 18 Jan 2012 14:21:23 -0000 X-SWARE-Spam-Status: No, hits=-3.2 required=5.0 tests=AWL,BAYES_00,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from cantor2.suse.de (HELO mx2.suse.de) (195.135.220.15) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 18 Jan 2012 14:21:09 +0000 Received: from relay2.suse.de (unknown [195.135.220.254]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id E684F8C061 for ; Wed, 18 Jan 2012 15:21:07 +0100 (CET) Date: Wed, 18 Jan 2012 14:21:00 -0000 From: Richard Guenther To: gcc-patches@gcc.gnu.org Subject: [PATCH] Fix PR49484, gthr requirements update (target maintainers have a looksee) Message-ID: User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org X-SW-Source: 2012-01/txt/msg00906.txt.bz2 This fixes PR49484 by protecting __gcov_flush against concurrent execution. To be able to use the gthread facility I have to introduce the requirement that __GTHREAD_MUTEX_INIT_FUNCTION is always available, even if __GTHREAD_MUTEX_INIT is available as otherwise no dynamic initialization of a mutex is possible. I have adjusted gthr-posix.h and gthr-single.h only - target maintainers, please update your ports accordingly in advance. Boostrap and regtest on x86_64-unknown-linux-gnu is ongoing, but this looks like something for stage1 anyway. Richard. 2012-01-18 Richard Guenther * 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. Index: libgcc/libgcov.c =================================================================== *** libgcc/libgcov.c (revision 183270) --- libgcc/libgcov.c (working copy) *************** see the files COPYING3 and COPYING.RUNTI *** 30,35 **** --- 30,36 ---- #include "coretypes.h" #include "tm.h" #include "libgcc_tm.h" + #include "gthr.h" #if defined(inhibit_libc) #define IN_LIBGCOV (-1) *************** __gcov_init (struct gcov_info *info) *** 705,710 **** --- 706,730 ---- info->version = 0; } + #ifdef __GTHREAD_MUTEX_INIT + ATTRIBUTE_HIDDEN __gthread_mutex_t __gcov_flush_mx = __GTHREAD_MUTEX_INIT; + #define init_mx_once() + #else + __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN; + + static void + init_mx (void) + { + __GTHREAD_MUTEX_INIT_FUNCTION (&mx); + } + static void + init_mx_once (void) + { + static __gthread_once_t once = __GTHREAD_ONCE_INIT; + __gthread_once (&once, init_mx); + } + #endif + /* Called before fork or exec - write out profile information gathered so far and reset it to zero. This avoids duplication or loss of the profile information gathered so far. */ *************** __gcov_flush (void) *** 714,719 **** --- 734,742 ---- { const struct gcov_info *gi_ptr; + init_mx_once (); + __gthread_mutex_lock (&__gcov_flush_mx); + gcov_exit (); for (gi_ptr = gcov_list; gi_ptr; gi_ptr = gi_ptr->next) { *************** __gcov_flush (void) *** 737,742 **** --- 760,767 ---- } } } + + __gthread_mutex_unlock (&__gcov_flush_mx); } #endif /* L_gcov */ *************** __gcov_ior_profiler (gcov_type *counters *** 975,982 **** pid_t __gcov_fork (void) { __gcov_flush (); ! return fork (); } #endif --- 1000,1012 ---- pid_t __gcov_fork (void) { + pid_t pid; + extern __gthread_mutex_t __gcov_flush_mx; __gcov_flush (); ! pid = fork (); ! if (pid == 0) ! __GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx); ! return pid; } #endif Index: libgcc/unwind-dw2-fde.c =================================================================== *** libgcc/unwind-dw2-fde.c (revision 183270) --- libgcc/unwind-dw2-fde.c (working copy) *************** static struct object *seen_objects; *** 47,57 **** #ifdef __GTHREAD_MUTEX_INIT static __gthread_mutex_t object_mutex = __GTHREAD_MUTEX_INIT; #else static __gthread_mutex_t object_mutex; - #endif - #ifdef __GTHREAD_MUTEX_INIT_FUNCTION static void init_object_mutex (void) { --- 47,56 ---- #ifdef __GTHREAD_MUTEX_INIT static __gthread_mutex_t object_mutex = __GTHREAD_MUTEX_INIT; + #define init_object_mutex_once() #else static __gthread_mutex_t object_mutex; static void init_object_mutex (void) { *************** init_object_mutex_once (void) *** 64,71 **** static __gthread_once_t once = __GTHREAD_ONCE_INIT; __gthread_once (&once, init_object_mutex); } - #else - #define init_object_mutex_once() #endif /* Called from crtbegin.o to register the unwind info for an object. */ --- 63,68 ---- Index: libgcc/gthr-posix.h =================================================================== *** libgcc/gthr-posix.h (revision 183270) --- libgcc/gthr-posix.h (working copy) *************** typedef struct timespec __gthread_time_t *** 63,68 **** --- 63,69 ---- #define __GTHREAD_HAS_COND 1 #define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER + #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function #define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT #if defined(PTHREAD_RECURSIVE_MUTEX_INITIALIZER) #define __GTHREAD_RECURSIVE_MUTEX_INIT PTHREAD_RECURSIVE_MUTEX_INITIALIZER *************** __gthread_setspecific (__gthread_key_t _ *** 731,736 **** --- 732,745 ---- } static inline int + __gthread_mutex_init_function (__gthread_mutex_t *__mutex) + { + if (__gthread_active_p ()) + return __gthrw_(pthread_mutex_init) (__mutex, NULL); + return 0; + } + + static inline int __gthread_mutex_destroy (__gthread_mutex_t *__mutex) { if (__gthread_active_p ()) Index: libgcc/gthr-single.h =================================================================== *** libgcc/gthr-single.h (revision 183270) --- libgcc/gthr-single.h (working copy) *************** typedef int __gthread_recursive_mutex_t; *** 36,41 **** --- 36,42 ---- #define __GTHREAD_ONCE_INIT 0 #define __GTHREAD_MUTEX_INIT 0 + #define __GTHREAD_MUTEX_INIT_FUNCTION (mx) #define __GTHREAD_RECURSIVE_MUTEX_INIT 0 #define UNUSED __attribute__((unused)) Index: libgcc/gthr.h =================================================================== --- libgcc/gthr.h (revision 183270) +++ libgcc/gthr.h (working copy) @@ -52,11 +52,12 @@ see the files COPYING3 and COPYING.RUNTI to initialize __gthread_mutex_t to get a fast non-recursive mutex. __GTHREAD_MUTEX_INIT_FUNCTION - some systems can't initialize a mutex without a - function call. On such systems, define this to a - function which looks like this: + to initialize __gthread_mutex_t to get a fast + non-recursive mutex. + Define this to a function which looks like this: void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *) - Don't define __GTHREAD_MUTEX_INIT in this case + Some systems can't initialize a mutex without a + function call. Don't define __GTHREAD_MUTEX_INIT in this case. __GTHREAD_RECURSIVE_MUTEX_INIT __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION as above, but for a recursive mutex.