2008-03-01 Neal H. Walfield <neal@gnu.org>

	Add signal implementation.
	* Makefile.am (SYSDEP_PATH): Add $(srcdir)/signal.
	(libpthread_a_SOURCES): Add pt-mutex-transfer-np.c, kill.c,
	killpg.c, pt-kill-siginfo-np.c, raise.c, sigaction.c, sigaddset.c,
	sigaltstack.c, sigdelset.c, sigemptyset.c, sigfillset.c,
	sig-internal.c, sig-internal.h, siginterrupt.c, sigismember.c,
	signal.c, signal-dispatch.c, signal.h, sigpending.c,
	sigprocmask.c, sigsuspend.c, sigtimedwait.c, sigwait.c,
	sigwaiter.c, sigwaitinfo.c, signal-dispatch-lowlevel.c, and
	sigprocmask.c.
	* headers.m4: Link libpthread/signal/signal.h into ../include.
	* sysdeps/generic/pt-mutex-transfer-np.c: New file.
        * signal/README: New file.
        * signal/TODO: Likewise.
        * signal/kill.c: Likewise.
        * signal/pt-kill-siginfo-np.c: Likewise.
        * signal/sig-internal.c: Likewise.
        * signal/sig-internal.h: Likewise.
        * signal/sigaction.c: Likewise.
        * signal/sigaltstack.c: Likewise.
        * signal/signal-dispatch.c: Likewise.
        * signal/signal.h: Likewise.
        * signal/sigpending.c: Likewise.
        * signal/sigsuspend.c: Likewise.
        * signal/sigtimedwait.c: Likewise.
        * signal/sigwaiter.c: Likewise.
        * signal/sigwaitinfo.c: Likewise.
	* sysdeps/l4/hurd/sig-sysdep.h: Likewise.
	* sysdeps/l4/hurd/sigprocmask.c: Likewise.
	* sysdeps/generic/killpg.c: Likewise.
	* sysdeps/generic/pt-kill.c: Likewise.
	* sysdeps/generic/raise.c: Likewise.
	* sysdeps/generic/sigaddset.c: Likewise.
	* sysdeps/generic/sigdelset.c: Likewise.
	* sysdeps/generic/sigemptyset.c: Likewise.
	* sysdeps/generic/sigfillset.c: Likewise.
	* sysdeps/generic/siginterrupt.c: Likewise.
	* sysdeps/generic/sigismember.c: Likewise.
	* sysdeps/generic/signal.c: Likewise.
	* sysdeps/generic/sigwait.c: Likewise.
	* sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c: Likewise.
	* sysdeps/l4/hurd/pt-sysdep.c (sigprocmask): Remove function.
	* sysdeps/l4/hurd/pt-sigstate.c (__pthread_sigstate): Implement
	it.
	* sysdeps/l4/hurd/pt-sigstate-init.c: Include <sig-internal.h>.
	(__pthread_sigstate_init): Initialize THREAD->SS.
	* sysdeps/l4/hurd/pt-kill.c: Remove file.
	* pthread/pt-internal.h: Include <sig-internal.h>.
	(PTHREAD_SIGNAL_MEMBERS) [! PTHREAD_SIGNAL_MEMBERS]: Define.
	(struct __pthread): Add PTHREAD_SIGNAL_MEMBERS.
	* pthread/pt-self.c (pthread_self): Assert that SELF is not NULL.

1 files changed, 29 insertions, 0 deletions

diff --git a/signal/TODO b/signal/TODO
new file mode 100644
index 00000000..1148abb3
--- /dev/null
+++ b/signal/TODO
@@ -0,0 +1,29 @@
+Unimplemented Functionality
+---------------------------
+
+We don't support interruptible functions.  That is, if a signal is
+delivered when a thread is in e.g. the write system call, then the
+write function should be interrupted and return EINTR when the signal
+handler is finished.  To realize this behavior, we could have a thread
+local interruptible flag and a setjmp buffer.  A function that is
+interruptible would fill the jump buffer and set the interruptible
+flag.  If a signal comes in and the interruptible flag is set, rather
+than resuming the thread, we longjmp to the buffer.
+
+If a signal action has set the SA_SIGINFO, the third argument must be
+a pointer to a ucontext describing the thread's interrupted state;
+this implementation passes NULL.  This isn't as bad as it sounds as
+the the ucontext family of functions are marked obsolete in SUSv3 with
+the advisory that any use of them should be replaced by the use of
+pthread functionality (cf. makecontext rationale).
+
+stop and continue signals are not implemented (as we need to stop all
+threads, this requires being in bed with libpthread).
+
+Implementation is not yet cancellation-safe.
+
+There are not even stubs for sighold, sigingore, sigpause, sigrelse,
+however, according to posix: "Use of any of these functions is
+unspecified in a multi-threaded process."
+
+Implement sigtimedwait, sigqueue.
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