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dc9c271aa1
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Julian Elischer dc9c271aa1 Changes to the LINUX_THREADS support to only allocate extra memory for 
shared signal handling when there is shared signal handling being
used.

This removes the main objection to making the shared signal handling
a standard ability in rfork() and friends and 'unconditionalising'
this code. (i.e. the allocation of an extra 328 bytes per process).

Signal handling information remains in the U area until such a time as
it's reference count would be incremented to > 1. At that point a new
struct is malloc'd and maintained in KVM so that it can be shared between
the processes (threads) using it.

A function to check the reference count and move the struct back to the U
area when it drops back to 1 is also supplied. Signal information is
therefore now swapable for all processes that are not sharing that
information with other processes. THis should addres the concerns raised
by Garrett and others.

Submitted by:	"Richard Seaman, Jr." <dick@tar.com>
1999-01-07 21:23:50 +00:00
..
alpha Add (but don't activate) code for a special VM option to make 1999-01-06 23:05:42 +00:00
amd64 Remove a hard-coded table of kernel console I/O functions exported 1999-01-07 14:14:24 +00:00
boot Alpha-specific help topics (currently empty) 1999-01-05 20:44:26 +00:00
cam Like the problems just fixed in scsi_da.c, make sure 1999-01-07 20:20:57 +00:00
coda Don't pass unused unused timestamp args to UFS_UPDATE() or waste 1999-01-07 16:14:19 +00:00
compat Add (but don't activate) code for a special VM option to make 1999-01-06 23:05:42 +00:00
compile
conf Flip the kernel default to ELF.. Add a test to try and warn people 1999-01-07 06:52:41 +00:00
contrib/softupdates Don't pass unused unused timestamp args to UFS_UPDATE() or waste 1999-01-07 16:14:19 +00:00
ddb Examine all occurrences of sprintf(), strcat(), and str[n]cpy() 1998-12-04 22:54:57 +00:00
dev Remove a hard-coded table of kernel console I/O functions exported 1999-01-07 14:14:24 +00:00
fs Don't pass unused unused timestamp args to UFS_UPDATE() or waste 1999-01-07 16:14:19 +00:00
geom Update system to new device statistics code. 1998-09-15 08:15:30 +00:00
gnu Don't pass unused unused timestamp args to UFS_UPDATE() or waste 1999-01-07 16:14:19 +00:00
i4b Initial entry of ISDN4BSD into the FreeBSD tree. 1998-12-27 21:47:14 +00:00
i386 Remove a hard-coded table of kernel console I/O functions exported 1999-01-07 14:14:24 +00:00
isa Move IO_PSMSIZE from kbdio.h to isareg.h. 1999-01-06 05:49:30 +00:00
isofs/cd9660 Ifdefed conditionally used simplock variables. 1999-01-02 11:34:57 +00:00
kern Changes to the LINUX_THREADS support to only allocate extra memory for 1999-01-07 21:23:50 +00:00
libkern - Fix modulo bug. 1998-12-01 05:29:06 +00:00
miscfs A partial implementation of the procfs cmdline pseudo-file. This 1999-01-05 03:53:06 +00:00
modules Use M_VGA_VG320 if M_VESA_CG800x600 is not available. It looks ugly in 1999-01-01 14:40:49 +00:00
msdosfs Now empty DOS filesystems default to long file names. Non-empty filesystems 1999-01-02 18:52:13 +00:00
net Remove one unused variable. 1998-12-31 07:52:49 +00:00
netatalk The "easy" fixes for compiling the kernel -Wunused: remove unreferenced static 1998-12-07 21:58:50 +00:00
netatm Set and propagate the correct cause code values. 1998-12-11 21:47:47 +00:00
netinet Partial fix for when ipfw is used with bridging. Bridged packets 1998-12-31 07:43:29 +00:00
netipx Back out last change; there was 'fixup' code for the case later. 1998-12-09 13:48:08 +00:00
netkey The "easy" fixes for compiling the kernel -Wunused: remove unreferenced static 1998-12-07 21:58:50 +00:00
netnatm Examine all occurrences of sprintf(), strcat(), and str[n]cpy() 1998-12-04 22:54:57 +00:00
netns Make INET a proper option. 1998-01-08 23:42:31 +00:00
nfs Remove the 'waslocked' parameter to vfs_object_create(). 1999-01-05 18:50:03 +00:00
nfsclient Remove the 'waslocked' parameter to vfs_object_create(). 1999-01-05 18:50:03 +00:00
nfsserver Remove the 'waslocked' parameter to vfs_object_create(). 1999-01-05 18:50:03 +00:00
pc98 Sync with sys/i386/conf/options.i386 revision 1.101. 1999-01-04 08:09:15 +00:00
pccard probe function changed from returning char * to const char *. 1998-12-14 06:37:37 +00:00
pci Add some tweaks to mx_mii_readreg(), mx_phy_readreg(), mx_phy_writereg() 1999-01-06 17:30:06 +00:00
posix4 Set PAGE_SIZE for _SC_PAGESIZE sysconf(). 1998-06-01 21:54:43 +00:00
powerpc Various changes to support OSF1 emulation: 1998-12-30 10:38:59 +00:00
rpc
sys Changes to the LINUX_THREADS support to only allocate extra memory for 1999-01-07 21:23:50 +00:00
tools Make the vnode opv vector construction fully dynamic. Previously we 1998-11-10 09:04:09 +00:00
ufs Don't pass unused unused timestamp args to UFS_UPDATE() or waste 1999-01-07 16:14:19 +00:00
vm Changes to the LINUX_THREADS support to only allocate extra memory for 1999-01-07 21:23:50 +00:00
Makefile Backed out previous commit. It depends on a.out utilities and libraries 1998-12-30 12:06:08 +00:00