Merge branch 'master' of git+ssh://git.freedesktop.org/git/xcb/libxcb

NEWS

@@ -1,3 +1,60 @@
+Release 1.1 (2007-11-04)
+========================
+
+This release requires xcb-proto 1.1, due to the addition of the
+extension-multiword attribute to the XML schema.
+
+This release contains several important bug fixes, summarized below. It
+also contains a patch much like Novell's libxcb-sloppy-lock.diff.
+Rationale from the commit message follows. The patch and this rationale
+were authored by Jamey Sharp <jamey@minilop.net>, with agreement from
+Josh Triplett <josh@freedesktop.org>.
+
+    I strongly opposed proposals like this one for a long time.
+    Originally I had a very good reason: libX11, when compiled to use
+    XCB, would crash soon after a locking correctness violation, so it
+    was better to have an informative assert failure than a mystifying
+    crash soon after.
+
+    It took some time for me to realize that I'd changed the libX11
+    implementation (for unrelated reasons) so that it could survive most
+    invalid locking situations, as long as it wasn't actually being used
+    from multiple threads concurrently.
+
+    The other thing that has changed is that most of the code with
+    incorrect locking has now been fixed. The value of the assert is
+    accordingly lower.
+
+    However, remaining broken callers do need to be fixed. That's why
+    libXCB will still noisily print a stacktrace (if possible) on each
+    assertion failure, even when assert isn't actually invoked to
+    abort() the program; and that's why aborting is still default. This
+    environment variable is provided only for use as a temporary
+    workaround for broken applications.
+
+Enhancements:
+* Print a backtrace, if possible, on locking assertion failures.
+* Skip abort() on locking assertions if LIBXCB_ALLOW_SLOPPY_LOCK is set.
+* xcb_poll_for_event: Return already-read events before reading again.
+* Output a configuration summary at the end of ./configure.
+
+Bug fixes:
+* Don't hold the xlib-xcb lock while sleeping: that allows deadlock.
+* Allow unix:<screen> style display names again.
+* Bug #9119: test xcb_popcount
+* Fix unit tests for FreeBSD
+* NetBSD doesn't have AI_ADDRCONFIG: use it only if it's available.
+* Require libXau >= 0.99.2; earlier versions have a broken .pc file
+* Use substitition variables in xcb-xinerama.pc.in
+* Update autogen.sh to one that does objdir != srcdir
+* Add tools/* and autogen.sh to EXTRA_DIST.
+* Doxygen can now be fully disabled if desired.
+
+Documentation improvements:
+* Many fixes and updates to the tutorial.
+* Iterators, requests, and replies get partial Doxygen documentation.
+
+
 Release 1.0 (2006-11-23)
 ========================
 

README

@@ -1,11 +1,12 @@
 About libxcb
 ============
 
-libxcb provides an interface to the X Window System protocol, which replaces
-the current Xlib interface. It has several advantages over Xlib, including:
-- size: small library and lower memory footprint
+libxcb provides an interface to the X Window System protocol, which
+replaces the current Xlib interface. It has several advantages over
+Xlib, including:
+- size: small, simple library, and lower memory footprint
 - latency hiding: batch several requests and wait for the replies later
-- direct protocol access: one-to-one mapping between interface and protocol
+- direct protocol access: interface and protocol correspond exactly
 - proven thread support: transparently access XCB from multiple threads
 - easy extension implementation: interfaces auto-generated from XML-XCB
 

configure.ac

@@ -3,7 +3,7 @@
 
 AC_PREREQ(2.57)
 AC_INIT([libxcb],
-        1.0,
+        1.1,
         [xcb@lists.freedesktop.org])
 AC_CONFIG_SRCDIR([xcb.pc.in])
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
@@ -30,7 +30,7 @@ fi
 AC_SUBST(HTML_CHECK_RESULT)
 
 # Checks for pkg-config packages
-PKG_CHECK_MODULES(XCBPROTO, xcb-proto >= 1.0)
+PKG_CHECK_MODULES(XCBPROTO, xcb-proto >= 1.1)
 NEEDED="pthread-stubs xau >= 0.99.2"
 PKG_CHECK_MODULES(NEEDED, $NEEDED)
 

src/c-client.xsl

@@ -451,11 +451,6 @@ authorization from the authors.
         </xsl:when>
       </xsl:choose>
     </xsl:variable>
-    <xsl:choose>
-      <xsl:when test="self::error|self::errorcopy">
-        <constant type="number" name="{xcb:xcb-prefix(concat('Bad', @name))}" value="{@number}" />
-      </xsl:when>
-    </xsl:choose>
     <constant type="number" name="{xcb:xcb-prefix(@name)}" value="{@number}" />
     <xsl:choose>
       <xsl:when test="self::event|self::error">

src/xcb_conn.c

@@ -62,6 +62,9 @@ static int set_fd_flags(const int fd)
 static int _xcb_xlib_init(_xcb_xlib *xlib)
 {
     xlib->lock = 0;
+#ifndef NDEBUG
+    xlib->sloppy_lock = (getenv("LIBXCB_ALLOW_SLOPPY_LOCK") != 0);
+#endif
     pthread_cond_init(&xlib->cond, 0);
     return 1;
 }
@@ -285,15 +288,33 @@ void _xcb_unlock_io(xcb_connection_t *c)
     pthread_mutex_unlock(&c->iolock);
 }
 
+void _xcb_wait_io(xcb_connection_t *c, pthread_cond_t *cond)
+{
+    int xlib_locked = c->xlib.lock;
+    if(xlib_locked)
+    {
+        c->xlib.lock = 0;
+        pthread_cond_broadcast(&c->xlib.cond);
+    }
+    pthread_cond_wait(cond, &c->iolock);
+    if(xlib_locked)
+    {
+        while(c->xlib.lock)
+            pthread_cond_wait(&c->xlib.cond, &c->iolock);
+        c->xlib.lock = 1;
+        c->xlib.thread = pthread_self();
+    }
+}
+
 int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
 {
-    int ret;
+    int ret, xlib_locked;
     fd_set rfds, wfds;
 
     /* If the thing I should be doing is already being done, wait for it. */
     if(count ? c->out.writing : c->in.reading)
     {
-        pthread_cond_wait(cond, &c->iolock);
+        _xcb_wait_io(c, cond);
         return 1;
     }
 
@@ -308,6 +329,12 @@ int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vec
         ++c->out.writing;
     }
 
+    xlib_locked = c->xlib.lock;
+    if(xlib_locked)
+    {
+        c->xlib.lock = 0;
+        pthread_cond_broadcast(&c->xlib.cond);
+    }
     _xcb_unlock_io(c);
     do {
 	ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
@@ -318,6 +345,11 @@ int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vec
 	ret = 0;
     }
     _xcb_lock_io(c);
+    if(xlib_locked)
+    {
+        c->xlib.lock = 1;
+        c->xlib.thread = pthread_self();
+    }
 
     if(ret)
     {

src/xcb_out.c

@@ -190,7 +190,7 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
     _xcb_lock_io(c);
     /* wait for other writing threads to get out of my way. */
     while(c->out.writing)
-        pthread_cond_wait(&c->out.cond, &c->iolock);
+        _xcb_wait_io(c, &c->out.cond);
 
     request = ++c->out.request;
     /* send GetInputFocus (sync) when 64k-2 requests have been sent without
@@ -297,7 +297,7 @@ int _xcb_out_flush_to(xcb_connection_t *c, unsigned int request)
         return _xcb_out_send(c, &vec_ptr, &count);
     }
     while(c->out.writing)
-        pthread_cond_wait(&c->out.cond, &c->iolock);
+        _xcb_wait_io(c, &c->out.cond);
     assert(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request));
     return 1;
 }

src/xcb_xlib.c

@@ -55,9 +55,9 @@ static void xcb_xlib_printbt(void)
 }
 
 #ifndef NDEBUG
-#define xcb_assert(x) do { if (!(x)) { xcb_xlib_printbt(); assert(x); } } while(0)
+#define xcb_assert(c,x) do { if (!(x)) { xcb_xlib_printbt(); if (!(c)->xlib.sloppy_lock) assert(x); } } while(0)
 #else
-#define xcb_assert(x)
+#define xcb_assert(c,x)
 #endif
 
 unsigned int xcb_get_request_sent(xcb_connection_t *c)
@@ -70,7 +70,7 @@ unsigned int xcb_get_request_sent(xcb_connection_t *c)
 void xcb_xlib_lock(xcb_connection_t *c)
 {
     _xcb_lock_io(c);
-    xcb_assert(!c->xlib.lock);
+    xcb_assert(c, !c->xlib.lock);
     c->xlib.lock = 1;
     c->xlib.thread = pthread_self();
     _xcb_unlock_io(c);
@@ -79,8 +79,8 @@ void xcb_xlib_lock(xcb_connection_t *c)
 void xcb_xlib_unlock(xcb_connection_t *c)
 {
     _xcb_lock_io(c);
-    xcb_assert(c->xlib.lock);
-    xcb_assert(pthread_equal(c->xlib.thread, pthread_self()));
+    xcb_assert(c, c->xlib.lock);
+    xcb_assert(c, pthread_equal(c->xlib.thread, pthread_self()));
     c->xlib.lock = 0;
     pthread_cond_broadcast(&c->xlib.cond);
     _xcb_unlock_io(c);

src/xcbint.h

@@ -130,6 +130,7 @@ int _xcb_in_read_block(xcb_connection_t *c, void *buf, int nread);
 
 typedef struct _xcb_xlib {
     int lock;
+    int sloppy_lock;
     pthread_t thread;
     pthread_cond_t cond;
 } _xcb_xlib;
@@ -182,6 +183,7 @@ struct xcb_connection_t {
 };
 
 void _xcb_conn_shutdown(xcb_connection_t *c);
+void _xcb_wait_io(xcb_connection_t *c, pthread_cond_t *cond);
 int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count);
 
 

xcb-xselinux.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: XCB SELinux
+Description: XCB SELinux Extension
+Version: @PACKAGE_VERSION@
+Requires: xcb
+Libs: -L${libdir} -lxcb-xselinux
+Cflags: -I${includedir}