diff options
author | Roland McGrath <roland@gnu.org> | 1996-05-04 09:46:57 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 1996-05-04 09:46:57 +0000 |
commit | 8f0c527e13b836a44fedbf6abc84e1901e2cc10d (patch) | |
tree | 2ef83b10742b3fa4e7dd89b7b55229ebf48c6818 /hurd/hurd/signal.h | |
parent | 7a12c6bba750ca500009854db3a0fcdfb1ad61a7 (diff) |
Sat May 4 05:44:25 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* hurd/hurd-raise.c (_hurd_raise_signal): Pass sigcode in msg_sig_post
rpc.
* hurd/hurdmsg.c (_S_msg_set_environment): Use argz.h functions
instead of _hurd_split_args.
(_S_msg_*_exec_flags): Functions removed.
(_S_msg_startup_dosync): Stub removed.
Sat May 4 02:11:55 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* sysdeps/mach/hurd/ptrace.c: Set _hurdsig_traced instead of
EXEC_TRACED bit in _hurd_exec_flags.
Pass sigcode arg in msg_sig_post_untraced rpc.
* sysdeps/mach/hurd/access.c: Don't pass io port in
auth_user_authenticate rpc.
* posix/sched.h: Fix typos.
* sysdeps/mach/hurd/fork.c: Use new critical section lock.
Clear _hurdsig_traced instead of EXEC_TRACED.
* sysdeps/stub/nanosleep.c (nanosleep): Fix typo.
* wcsmbs/wcstol.c: Find strtol.c in ../stdlib.
* wcsmbs/wcstof.c: Find strtod.c in ../stdlib.
* wcsmbs/wcstod.c: Likewise.
* wcsmbs/wcstold.c: Likewise.
* wcsmbs/wcwidth.h: Find cname-lookup.h in ../wctype.
* string/envz.c (envz_entry): Use const.
(envz_get, envz_remove): Likewise.
(envz_entry): Return char *, not const char *.
* string/envz.h: Fix decl.
* string/argz-create.c: Use const in prototype.
* string/argz-next.c: Likewise.
* sysdeps/mach/hurd/sigprocmask.c: Pass sigcode arg to msg_sig_post.
* sysdeps/mach/hurd/i386/sigreturn.c: Likewise.
* sysdeps/mach/hurd/sigsuspend.c: Likewise.
* sysdeps/mach/hurd/kill.c: Likewise.
* hurd/hurdexec.c (_hurd_exec): Use new critical section lock.
* hurd/catch-exc.c (_S_catch_exception_raise): Likewise.
* hurd/sigunwind.c (_hurdsig_longjmp_from_handler): Likewise.
* hurd/thread-cancel.c (hurd_thread_cancel, hurd_check_cancel):
Likewise.
* sysdeps/mach/hurd/jmp-unwind.c (_longjmp_unwind): Likewise.
* sysdeps/mach/hurd/sigaction.c: Likewise.
* sysdeps/mach/hurd/errnos.awk: Don't use ARGV in comment; it can
change meaninglessly.
* hurd/hurd/signal.h (struct hurd_sigstate): Replace critical section
flag with a spin lock.
(_hurd_critical_section_lock): Use spin_try_lock on that to see if we
get it. No need to take SS->lock at all.
(_hurd_critical_section_unlock): Unlock SS->critical_section_lock
instead of clearing the old flag member.
* hurd/hurdsig.c (_hurd_internal_post_signal): Use spin_lock_locked to
test the critical section state.
* hurd/hurdinit.c (_hurd_init): Set _hurdsig_traced from the intarray.
* hurd/hurdkill.c (_hurd_sig_post): Pass 0 sigcode in msg_sig_post.
* hurd/hurdsig.c (_hurd_internal_post_signal): Test _hurdsig_traced
instead of testing (_hurd_exec_flags & EXEC_TRACED).
(_S_msg_sig_post): Take sigcode arg and pass it through.
(_S_msg_sig_post_untraced): Likewise.
(reauth_proc): Don't pass proc port in auth_user_authenticate.
* hurd/setauth.c (_hurd_setauth): Don't pass object ports in
auth_user_authenticate RPCs, just the one-off rendezvous port.
* hurd/dtable.c (reauth_dtable): Likewise.
* hurd/hurdlookup.c (__hurd_file_name_lookup_retry): Likewise.
* hurd/hurdexec.c (_hurd_exec): Pass 0 flags to file_exec.
Pass sigcode arg to msg_sig_post.
* string/argz.h (argz_create): Use const in prototype.
* hurd/hurdinit.c (_hurd_proc_init): Test _hurdsig_traced instead of
testing (_hurd_exec_flags & EXEC_TRACED).
Pass sigcode arg to msg_sig_post.
* hurd/hurd.h: Declare _hurdsig_traced.
* string/argz.h (__argz_next): Cast ENTRY before returning it.
* hurd/hurd/signal.h (_hurd_critical_section_unlock): Pass sigcode arg
to msg_sig_post.
* hurd/path-lookup.c: New file.
* hurd/Makefile (routines): Add path-lookup.
* hurd/hurd/lookup.h: Declare file_name_path_scan,
hurd_file_name_path_lookup.
* hurd/hurd.h: Declare file_name_path_lookup.
* sysdeps/mach/hurd/select.c: The io_select rpc no longer has a TAG_ID
argument. Instead, use a separate reply port for each RPC and put them
all in a port set to wait for slow replies.
Diffstat (limited to 'hurd/hurd/signal.h')
-rw-r--r-- | hurd/hurd/signal.h | 38 |
1 files changed, 16 insertions, 22 deletions
diff --git a/hurd/hurd/signal.h b/hurd/hurd/signal.h index 1973bcdb3c..fdaafdf459 100644 --- a/hurd/hurd/signal.h +++ b/hurd/hurd/signal.h @@ -47,9 +47,9 @@ struct hurd_signal_preempter; /* <hurd/sigpreempt.h> */ struct hurd_sigstate { - spin_lock_t lock; /* Locks most of the rest of the structure. */ + spin_lock_t critical_section_lock; /* Held if in critical section. */ - int critical_section; /* Nonzero if in critical section. */ + spin_lock_t lock; /* Locks most of the rest of the structure. */ thread_t thread; struct hurd_sigstate *next; /* Linked-list of thread sigstates. */ @@ -159,27 +159,22 @@ _hurd_critical_section_lock (void) (void *) __hurd_threadvar_location (_HURD_THREADVAR_SIGSTATE); struct hurd_sigstate *ss = *location; if (ss == NULL) - /* The thread variable is unset; this must be the first time we've - asked for it. In this case, the critical section flag cannot - possible already be set. Look up our sigstate structure the slow - way; this locks the sigstate lock. */ - ss = *location = _hurd_thread_sigstate (__mach_thread_self ()); - else - __spin_lock (&ss->lock); - - if (ss->critical_section) { - /* We are already in a critical section, so do nothing. */ + /* The thread variable is unset; this must be the first time we've + asked for it. In this case, the critical section flag cannot + possible already be set. Look up our sigstate structure the slow + way; this locks the sigstate lock. */ + ss = *location = _hurd_thread_sigstate (__mach_thread_self ()); __spin_unlock (&ss->lock); - return NULL; } - /* Set the critical section flag so no signal handler will run. */ - ss->critical_section = 1; - __spin_unlock (&ss->lock); + if (! __spin_try_lock (&ss->critical_section_lock)) + /* We are already in a critical section, so do nothing. */ + return NULL; - /* Return our sigstate pointer; this will be passed to - _hurd_critical_section_unlock to clear the critical section flag. */ + /* With the critical section lock held no signal handler will run. + Return our sigstate pointer; this will be passed to + _hurd_critical_section_unlock to unlock it. */ return ss; } @@ -191,19 +186,18 @@ _hurd_critical_section_unlock (void *our_lock) return; else { - /* It was us who acquired the critical section lock. Clear the - critical section flag. */ + /* It was us who acquired the critical section lock. Unlock it. */ struct hurd_sigstate *ss = our_lock; sigset_t pending; __spin_lock (&ss->lock); - ss->critical_section = 0; + __spin_unlock (&ss->critical_section_lock); pending = ss->pending & ~ss->blocked; __spin_unlock (&ss->lock); if (pending) /* There are unblocked signals pending, which weren't delivered because we were in the critical section. Tell the signal thread to deliver them now. */ - __msg_sig_post (_hurd_msgport, 0, __mach_task_self ()); + __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ()); } } |