freebsd-dev/sys/powerpc
David Xu 9104847f21 1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most
changes in MD code are trivial, before this change, trapsignal and
   sendsig use discrete parameters, now they uses member fields of
   ksiginfo_t structure. For sendsig, this change allows us to pass
   POSIX realtime signal value to user code.

2. Remove cpu_thread_siginfo, it is no longer needed because we now always
   generate ksiginfo_t data and feed it to libpthread.

3. Add p_sigqueue to proc structure to hold shared signals which were
   blocked by all threads in the proc.

4. Add td_sigqueue to thread structure to hold all signals delivered to
   thread.

5. i386 and amd64 now return POSIX standard si_code, other arches will
   be fixed.

6. In this sigqueue implementation, pending signal set is kept as before,
   an extra siginfo list holds additional siginfo_t data for signals.
   kernel code uses psignal() still behavior as before, it won't be failed
   even under memory pressure, only exception is when deleting a signal,
   we should call sigqueue_delete to remove signal from sigqueue but
   not SIGDELSET. Current there is no kernel code will deliver a signal
   with additional data, so kernel should be as stable as before,
   a ksiginfo can carry more information, for example, allow signal to
   be delivered but throw away siginfo data if memory is not enough.
   SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can
   not be caught or masked.
   The sigqueue() syscall allows user code to queue a signal to target
   process, if resource is unavailable, EAGAIN will be returned as
   specification said.
   Just before thread exits, signal queue memory will be freed by
   sigqueue_flush.
   Current, all signals are allowed to be queued, not only realtime signals.

Earlier patch reviewed by: jhb, deischen
Tested on: i386, amd64
2005-10-14 12:43:47 +00:00
..
aim 1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most 2005-10-14 12:43:47 +00:00
compile
conf Introduce a kernel config for the Mandatory Access Control framework. 2005-09-18 03:15:36 +00:00
include Add a new atomic_fetchadd() primitive that atomically adds a value to a 2005-09-27 17:39:11 +00:00
ofw Add a font width argument to vi_load_font_t, vi_save_font_t and vi_putm_t 2005-09-28 14:54:07 +00:00
powermac The end values passed to rman_manage_region() for PCI i/o and mem 2005-05-29 08:51:21 +00:00
powerpc 1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most 2005-10-14 12:43:47 +00:00
psim Remove bus_{mem,p}io.h and related code for a micro-optimization on i386 2005-05-29 04:42:30 +00:00