freebsd-skq/sys/i386
jhb 279b2b8278 Locking for the per-process resource limits structure.
- struct plimit includes a mutex to protect a reference count.  The plimit
  structure is treated similarly to struct ucred in that is is always copy
  on write, so having a reference to a structure is sufficient to read from
  it without needing a further lock.
- The proc lock protects the p_limit pointer and must be held while reading
  limits from a process to keep the limit structure from changing out from
  under you while reading from it.
- Various global limits that are ints are not protected by a lock since
  int writes are atomic on all the archs we support and thus a lock
  wouldn't buy us anything.
- All accesses to individual resource limits from a process are abstracted
  behind a simple lim_rlimit(), lim_max(), and lim_cur() API that return
  either an rlimit, or the current or max individual limit of the specified
  resource from a process.
- dosetrlimit() was renamed to kern_setrlimit() to match existing style of
  other similar syscall helper functions.
- The alpha OSF/1 compat layer no longer calls getrlimit() and setrlimit()
  (it didn't used the stackgap when it should have) but uses lim_rlimit()
  and kern_setrlimit() instead.
- The svr4 compat no longer uses the stackgap for resource limits calls,
  but uses lim_rlimit() and kern_setrlimit() instead.
- The ibcs2 compat no longer uses the stackgap for resource limits.  It
  also no longer uses the stackgap for accessing sysctl's for the
  ibcs2_sysconf() syscall but uses kernel_sysctl() instead.  As a result,
  ibcs2_sysconf() no longer needs Giant.
- The p_rlimit macro no longer exists.

Submitted by:	mtm (mostly, I only did a few cleanups and catchups)
Tested on:	i386
Compiled on:	alpha, amd64
2004-02-04 21:52:57 +00:00
..
acpica - Call acpi_Startup() before parsing interrupt-related APIC resources so we 2004-01-26 19:34:24 +00:00
bios - Implement selwakeuppri() which allows raising the priority of a 2003-11-09 09:17:26 +00:00
compile Don't need the .keep_me files. Obrien and I committed past each other. 2001-07-01 23:35:44 +00:00
conf Consistently capitalize acronyms like POSIX and NIC. Style. 2004-01-29 21:24:53 +00:00
cpufreq - Move performance-controlling sysctls into hw.p4tcc.* tree; 2004-01-24 21:13:13 +00:00
i386 Revert the skipping of segment register reloads as it appears to actually 2004-02-03 22:00:42 +00:00
ibcs2 Locking for the per-process resource limits structure. 2004-02-04 21:52:57 +00:00
include Add new CPU_ENABLE_TCC option, from NOTES: 2004-01-18 21:18:00 +00:00
isa Revert the skipping of segment register reloads as it appears to actually 2004-02-03 22:00:42 +00:00
linux Locking for the per-process resource limits structure. 2004-02-04 21:52:57 +00:00
pci Replace an outb() during the test for configuration mechanism #1 with a 2003-12-31 16:56:32 +00:00
svr4 Attempt to make the proper changes here for the proc.h commit: 2004-01-05 00:29:00 +00:00
Makefile This commit adds basic support for the UFS2 filesystem. The UFS2 2002-06-21 06:18:05 +00:00