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freebsd/sys/dev
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Alfred Perlstein 85f190e4d1 Fixes to make select/poll mpsafe. 
Problem:
  selwakeup required calling pfind which would cause lock order
  reversals with the allproc_lock and the per-process filedesc lock.
Solution:
  Instead of recording the pid of the select()'ing process into the
  selinfo structure, actually record a pointer to the thread.  To
  avoid dereferencing a bad address all the selinfo structures that
  are in use by a thread are kept in a list hung off the thread
  (protected by sellock).  When a selwakeup occurs the selinfo is
  removed from that threads list, it is also removed on the way out
  of select or poll where the thread will traverse its list removing
  all the selinfos from its own list.

Problem:
  Previously the PROC_LOCK was used to provide the mutual exclusion
  needed to ensure proper locking, this couldn't work because there
  was a single condvar used for select and poll and condvars can
  only be used with a single mutex.
Solution:
  Introduce a global mutex 'sellock' which is used to provide mutual
  exclusion when recording events to wait on as well as performing
  notification when an event occurs.

Interesting note:
  schedlock is required to manipulate the per-thread TDF_SELECT
  flag, however if given its own field it would not need schedlock,
  also because TDF_SELECT is only manipulated under sellock one
  doesn't actually use schedlock for syncronization, only to protect
  against corruption.

Proc locks are no longer used in select/poll.

Portions contributed by: davidc
2002-03-14 01:32:30 +00:00
..
aac Add ID's for a couple of upcoming cards. 2002-02-13 07:44:43 +00:00
acpica Only i386 has wbinvd(). 2002-03-12 09:45:17 +00:00
advansys
agp Correctly identify the Intel 82830 AGP bridge. 2002-02-05 23:13:25 +00:00
aha
ahb
aic Back out the hack from rev 1.13 that was done to initiate a bus rescan 2002-01-17 20:34:58 +00:00
aic7xxx Due to changes in the handling of the #line directive by GCC(cpp) 3.1, 2002-03-11 06:45:31 +00:00
amd
amr Staticise the amr devclass. 2002-01-08 06:47:02 +00:00
an In ad-hoc mode, the "associate" bit is valid to check to see if it is 2002-02-26 05:43:05 +00:00
ar
asr If we're going to ifdef out the only reference to asr_drvinit, then 2002-02-26 03:22:44 +00:00
ata Add new support for locking an ATA channel and use that throughout 2002-03-11 21:04:32 +00:00
atkbdc Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
awi Set ifp->if_name to "awi" instead of device_get_name(dev) to avoid 2002-02-26 20:09:19 +00:00
bge Remove mbuf exhaustion warning messages; these are handled by the 2002-02-11 23:29:15 +00:00
bktr Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
buslogic Use ANSI C string contatenation instead of a multi-line string literal. 2001-12-13 11:14:28 +00:00
cardbus Cleanup the recent cardbus cleanups. This fixes some of the panics 2002-03-13 05:38:19 +00:00
ccd Simple p_ucred -> td_ucred changes to start using the per-thread ucred 2002-02-27 18:32:23 +00:00
ciss Fix warning; line 1640: ciss_abort_request defined but not used. 2001-12-18 08:01:48 +00:00
cm - generic Arcnet framework 2002-01-08 20:03:13 +00:00
cnw Get rid of the twisted MFREE() macro entirely. 2002-02-05 02:00:56 +00:00
cs Migrate to PCMCIA_CARD() macros 2001-11-15 07:52:49 +00:00
ct
cy Initialize a variable bogusly to avoid a gcc bug that causes a spurious 2002-02-26 17:04:29 +00:00
dc Forgot one part of the VLAN support for the dc(4) driver. 2002-01-16 21:34:11 +00:00
de
dec
dgb Repair some warnings. These are accessing idle portions of shared memory 2002-02-27 23:43:19 +00:00
digi Fix warnings. The driver would be more useful with a DRIVER_MODULE() 2002-02-27 23:47:45 +00:00
dpt Fix a couple of bogus enums. 2002-01-08 06:47:55 +00:00
ed Add EDIMAX ethernet card for NEWCARD from NetBSD 2002-01-29 07:08:56 +00:00
eisa
em - Added support for receive in multiple 2002-02-13 18:19:27 +00:00
en
ep Two fixes from Jonathan Hanna: 2002-02-12 05:32:58 +00:00
ex
exca Default debugging to OFF now. 2002-02-04 15:55:21 +00:00
fb Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
fdc Disksort will not "munge" requests, BIO_ORDERED or not, so remove 2002-02-22 09:14:06 +00:00
fe Supported C-NET(98)P2 PnP mode. 2002-02-04 14:01:27 +00:00
fxp Remove mbuf exhaustion warning messages; these are handled by the 2002-02-04 03:15:27 +00:00
gem Use the pci_enable_* functions instead of manually fiddling with the 2002-03-11 02:37:19 +00:00
gfb
gx Don't pass an interface pointer to VLAN_INPUT{,_TAG}. Get it from the 2001-12-03 17:28:27 +00:00
hea Fix warnings 2002-02-27 23:53:02 +00:00
hfa
hme Use the pci_enable_* functions instead of manually fiddling with the 2002-03-11 02:37:19 +00:00
ic Oops, forgot to commit one file in the fd driver mega update. Here it 2001-12-16 07:52:13 +00:00
ichsmb Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
ida Fix a signed bug in the crashdump code for systems with > 2GB of ram. 2001-11-13 01:08:54 +00:00
ie
iicbus Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
iir Add the following functions/macros to support byte order conversions and 2002-02-27 17:16:18 +00:00
isp Disable RIO (reduced interrupt operation) for 2200 boards- it seemed like 2002-03-07 17:32:45 +00:00
ispfw Roll to latest production level firmware. 2002-01-23 06:42:54 +00:00
joy Revert change that breaks the joy module. joydevclass must not be static. 2002-01-08 18:27:49 +00:00
kbd Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
lge
lmc
lnc Get rid of the twisted MFREE() macro entirely. 2002-02-05 02:00:56 +00:00
mc146818
mca
mcd
md Simple p_ucred -> td_ucred changes to start using the per-thread ucred 2002-02-27 18:32:23 +00:00
mii Remove problematic PHY_WRITE so that autoneg to 10 Mbps 2002-02-27 02:11:34 +00:00
mlx Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
mly Fix warnings (comment out unused tables that are taking space in the 2002-02-27 23:57:18 +00:00
mse
musycc
ncv Staticise a couple of debugging variables. 2002-01-08 19:37:12 +00:00
nge Remove errors in LINT (now that they are fatal) 2002-02-27 02:21:43 +00:00
nmdm Simple p_ucred -> td_ucred changes to start using the per-thread ucred 2002-02-27 18:32:23 +00:00
nsp o Add KLD support for scsi_low. 2001-12-15 12:32:23 +00:00
null
ofw Move the make_dev call from the cn_probe to a sysinit that runs at 2002-01-09 04:03:55 +00:00
pccard Make hw.pccard.debug and hw.pccard.cis_debug tunable/sysctl. Setting to 1 2002-03-07 08:03:53 +00:00
pccbb Check the status of the card bridge first thing, rather than last in 2002-02-20 16:20:27 +00:00
pcf Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
pci Add 5th parameter to pci_read_device specifying the size of the object 2002-03-13 16:32:11 +00:00
pcic Fix missing comma in previous commit. 2001-12-28 23:51:48 +00:00
pdq Fix warning (passing wrong arg to arp_ifinit()) 2002-02-27 23:28:57 +00:00
ppbus Make this driver a better citizen by moving dev creation and 2001-12-19 19:37:31 +00:00
ppc Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
puc Remove the #if __FreeBSD_version glue now that the puc driver is part of 2002-03-08 17:41:22 +00:00
random Provide infrastructure for harvesting SWI entropy. 2002-03-03 20:09:42 +00:00
ray Update to C99, s/__FUNCTION__/__func__/, 2001-12-10 08:09:49 +00:00
rc Change the preemption code for software interrupt thread schedules and 2002-01-05 08:47:13 +00:00
rp #include "opt_compat.h" so that the support for old ioctls can actually 2002-02-15 08:28:34 +00:00
sbni Rename a variable that might accidentally be duplicated elsewhere. 2002-01-08 19:36:54 +00:00
scd
sf Remove printf's on mbuf/cluster allocation failures. There are now 2001-12-14 05:56:35 +00:00
si
sio Add pc98 support. 2002-03-08 12:41:32 +00:00
sk Remove printf's on mbuf/cluster allocation failures. There are now 2001-12-14 05:56:35 +00:00
smbus
sn Migrate to PCMCIA_CARD() macros 2001-11-15 07:52:49 +00:00
snc
snp Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
sound Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
speaker Add missing destroy_dev(). 2002-01-23 01:11:52 +00:00
sr
stg Staticise a couple of debugging variables. 2002-01-08 19:37:12 +00:00
streams Simple p_ucred -> td_ucred changes to start using the per-thread ucred 2002-02-27 18:32:23 +00:00
sym Comment tokens after #undef <macroname> and #endif. 2001-12-13 11:12:30 +00:00
syscons Fixed compilation warnings. 2002-03-06 08:55:34 +00:00
tdfx Replace ffind_* with fget calls. 2002-01-14 00:13:45 +00:00
tga
ti Remove mbuf exhaustion warning messages; these are handled by the 2002-02-11 23:38:30 +00:00
twe Update for the 6.9 firmware family (6xxx controllers), as well as for 2002-03-07 09:55:41 +00:00
tx Remove mbuf exhaustion warning messages; these are handled by the 2002-02-11 23:38:30 +00:00
txp Don't pass an interface pointer to VLAN_INPUT{,_TAG}. Get it from the 2001-12-03 17:28:27 +00:00
usb Fixes to make select/poll mpsafe. 2002-03-14 01:32:30 +00:00
vinum GC: BIO_ORDERED going away. 2002-02-22 09:18:46 +00:00
vr Remove printf's on mbuf/cluster allocation failures. There are now 2001-12-14 05:56:35 +00:00
vx Get rid of the twisted MFREE() macro entirely. 2002-02-05 02:00:56 +00:00
wds
wi Add support for 3Com Airconnect PCI cards. 2002-03-11 23:29:59 +00:00
wl Remove support for FreeBSD 2.x from this driver. 2002-02-27 23:34:02 +00:00
xe Remove an unused variable. 2002-02-26 03:37:35 +00:00