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Bruce Evans 0410dc5f5d Fix races in mouse signal handling almost properly using the INTOFF/INTON
method as in /bin/sh.

We still do technically undefined things in the signal handler, but it
is safe in practice to access state that is protected by INTOFF/INTON.

In a recent commit, I sprinkled VGLMouseFrozen++/-- operations in
places that need INTOFF/INTON.  This prevented clobbering of pixels
under the mouse, but left mouse signals deferred for too long.  It is
necessary to call the signal handler when the count goes to 0.  Old
versions did this in the unfreeze function, but didn't block actual
signals, so the signal handler raced itself.  The sprinkled operations
reduced the races, but when then worked to block a race they left
signals deferred for too long.

Use INTOFF/INTON to fix complete loss of mouse signals while reading
the mouse status.  Clobbering of the state was prevented by SIG_IGN'ing
mouse signals, but that has a high overhead and broke more than it
fixed by losing mouse signals completely.  sigprocmask() works to block
signals without losing them completely, but its overhead is also too
high.

libvgl's mouse signal handling is often worse than none.  Applications
can't block waiting for a mouse or keyboard or other event, but have
to busy-wait.  The SIG_IGN's lost about half of all mouse events while
busy-waiting for mouse events.
2019-03-29 15:20:48 +00:00
bin .Xr trim(8) from dd(1). 2019-03-26 15:44:06 +00:00
cddl Ensure that we use a 64-bit value for the last mmap() argument. 2019-03-20 23:35:15 +00:00
contrib readelf: add newline after dumping dynamic FLAGS / FLAGS_1 2019-03-28 17:30:47 +00:00
crypto Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
etc Compile and install most of the googletest examples 2019-03-11 19:50:44 +00:00
gnu Apply WITH_PIE changes to other binutils components 2019-03-25 01:18:26 +00:00
include Add verifying manifest loader for mac_veriexec 2019-02-26 06:17:23 +00:00
kerberos5 Add WITH_PIE knob to build Position Independent Executables 2019-02-15 22:22:38 +00:00
lib Fix races in mouse signal handling almost properly using the INTOFF/INTON 2019-03-29 15:20:48 +00:00
libexec rtld: attempt to fix reloc_non_plt TLS allocation on MIPS 2019-03-29 15:07:00 +00:00
release Bump the IMAGE_SIZE for arm64 SoC images to prevent failures due 2019-03-21 14:17:55 +00:00
rescue rescue: set NO_SHARED in Makefile 2018-11-19 22:18:18 +00:00
sbin Distinguish between lseek errors and read errores. 2019-03-28 18:20:47 +00:00
secure Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
share Add man page for VOP_FDATASYNC(9) 2019-03-29 02:44:20 +00:00
stand stand: remove CLANG_NO_IAS from zfsldr 2019-03-26 20:32:05 +00:00
sys fix the GENERIC-NODEBUG build after r345675 2019-03-29 14:07:30 +00:00
targets retire LINKER_FEATURES filter flag 2018-11-12 20:44:22 +00:00
tests Skip test if feature security_capabilities is not available 2019-03-29 08:43:21 +00:00
tools revert r302146: makeroot: zero out subsecond component of time= keywords 2019-03-27 17:28:23 +00:00
usr.bin dtc(1): Update to 1a79f5f26631 2019-03-28 03:48:51 +00:00
usr.sbin Make the "KB/s" field one character shorter (by reducing the precision) 2019-03-28 20:16:19 +00:00
.arcconfig
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.gitattributes MK_ZFS -> {MK_ZFS|MK_LOADER_ZFS}, this is so we can diable userland / kernel 2019-01-05 22:45:20 +00:00
.gitignore Ignore _.universe-toolchain file. 2018-07-01 13:50:37 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Update maintainers for libunwind and lldb. 2019-03-16 13:26:42 +00:00
Makefile Import tzdata 2019a 2019-03-26 07:55:48 +00:00
Makefile.inc1 pkgbase: Use uname as ABI_FILE 2019-03-27 17:55:39 +00:00
Makefile.libcompat Use ...-freebsd13.0 in -target strings. 2018-11-12 16:55:20 +00:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc Set tentative merge date, and bump __FreeBSD_version. 2019-03-04 19:23:11 +00:00
README Import tzdata 2019a 2019-03-26 07:55:48 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
UPDATING Add UPDATING note for geom_uzip(4)/xz, and bump geom_uzip(4) man page date. 2019-03-23 10:13:01 +00:00

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.

Source Roadmap:

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

gnu		Various commands and libraries under the GNU Public License.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

stand		Boot loader sources.

sys		Kernel sources.

sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
		used in release builds. NOTES contains documentation of
		all possible entries.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html