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Turn the mutex code back on. It looks like the deadlocks have disappeared as of the cairo_scaled_font_map patch from two days ago.

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Setup an automake conditional for the HAVE_PTHREAD case.
Link all tests with -lpthread if available, so that we can get some testing of cairo with mutexes turned on.
This commit is contained in:
Carl Worth 2005-08-13 03:26:18 +00:00
parent 615a32107d
commit 620de68bea
4 changed files with 31 additions and 37 deletions
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16
ChangeLog
View file

@ -1,3 +1,19 @@
2005-08-13 Carl Worth <cworth@cworth.org>
* src/cairoint.h: Turn the mutex code back on. It looks like the
deadlocks have disappeared as of the cairo_scaled_font_map patch
from two days ago.
* configure.in: Setup an automake conditional for the HAVE_PTHREAD
case.
* test/Makefile.am: Link all tests with -lpthread if available, so
that we can get some testing of cairo with mutexes turned on.
2005-08-13 Carl Worth <cworth@cworth.org>
* src/cairoint.h:
2005-08-13 Carl Worth <cworth@cworth.org>
Minor, cosmetic changes:

7
configure.in
View file

@ -330,11 +330,8 @@ AC_SUBST(FT_FONT_FEATURE)
dnl ===========================================================================
#
# The FreeType backend uses pthread locking when avaialble
#
AC_CHECK_HEADERS([pthread.h])
AC_CHECK_HEADERS([pthread.h], have_pthread=yes, have_pthread=no)
AM_CONDITIONAL(HAVE_PTHREAD, test "x$have_pthread" = "xyes")
dnl ===========================================================================

41
src/cairoint.h
View file

@ -117,43 +117,20 @@
#define __attribute__(x)
#endif
/* XXX: There's a bad bug in the cache locking code that attempts to
* recursively lock a mutex, (which we shouldn't actually need to ever
* do). This leads to deadlocks in even single-threaded applications,
* (if they link with -lpthread).
*
* For now, we're removing all mutex locking, which leaves things at
* the same level of non-thread-safeness that we've had in every
* snapshot since the cache code first landed.
*
* I'm rewriting the cache code now and plan to have thread-safe,
* locking caches working before the next snapshot. CDW.
*/
#if CAIRO_CACHE_CODE_IS_FIXED_TO_NOT_DEADLOCK_SINGLE_THREADED_APPLICATIONS
# if HAVE_PTHREAD_H
# define CAIRO_MUTEX_DECLARE(name) static pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER
# define CAIRO_MUTEX_DECLARE_GLOBAL(name) pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER
# define CAIRO_MUTEX_LOCK(name) pthread_mutex_lock (&name)
# define CAIRO_MUTEX_UNLOCK(name) pthread_mutex_unlock (&name)
# endif
# ifndef CAIRO_MUTEX_DECLARE
# warning "No mutex declarations, assuming single-threaded code"
# define CAIRO_MUTEX_DECLARE(name)
# define CAIRO_MUTEX_DECLARE_GLOBAL(name)
# define CAIRO_MUTEX_LOCK(name)
# define CAIRO_MUTEX_UNLOCK(name)
# endif
#else
#if HAVE_PTHREAD_H
# include <pthread.h>
# define CAIRO_MUTEX_DECLARE(name) static pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER
#define CAIRO_MUTEX_DECLARE_GLOBAL(name) pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER
# define CAIRO_MUTEX_LOCK(name) pthread_mutex_lock (&name)
# define CAIRO_MUTEX_UNLOCK(name) pthread_mutex_unlock (&name)
#endif
#ifndef CAIRO_MUTEX_DECLARE
# warning "No mutex declarations, assuming single-threaded code"
# define CAIRO_MUTEX_DECLARE(name)
# define CAIRO_MUTEX_DECLARE_GLOBAL(name)
# define CAIRO_MUTEX_LOCK(name)
# define CAIRO_MUTEX_UNLOCK(name)
#endif
#define MIN(a, b) ((a) < (b) ? (a) : (b))

4
test/Makefile.am
View file

@ -155,6 +155,10 @@ xmalloc.h
LDADDS = libcairotest.la $(top_builddir)/src/libcairo.la
if HAVE_PTHREAD
LDADDS += -lpthread
endif
# ARGH! I have to repeat the list of tests a third time. Maybe it's
# time to break down and auto-generate the Makefile.am or something
# from autogen.sh. My, but this is painful...