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Implement pthread_sigqueue.

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The kernel from 2.3.31 on supports the rt_tgsigqueueinfo syscall.
Use it to implement the non-standard extension which, like
sigqueue, can pass additional data to the receiving thread.
This commit is contained in:
Ulrich Drepper 2009-06-12 08:34:02 -07:00
parent 1828530f09
commit bfdb73e145
7 changed files with 107 additions and 2 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2009-06-12 Ulrich Drepper <drepper@redhat.com>
* Versions.def: Add GLIBC_2.11 for libpthread.
2009-06-11 Ulrich Drepper <drepper@redhat.com>
* resolv/res_send.c (send_dg): Remember we switched to

1
Versions.def
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@ -89,6 +89,7 @@ libpthread {
GLIBC_2.3.4
GLIBC_2.4
GLIBC_2.6
GLIBC_2.11
GLIBC_PRIVATE
}
libresolv {

7
nptl/ChangeLog
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@ -1,3 +1,10 @@
2009-06-12 Ulrich Drepper <drepper@redhat.com>
* Makefile (libpthread-routines): Add pthread_sigqueue.
* Versions: Add pthread_sigqueue for GLIBC_2.11.
* sysdeps/pthread/bits/sigthread.h: Declare pthread_sigqueue.
* sysdeps/unix/sysv/linux/pthread_sigqueue.c: New file.
2009-06-11 Ulrich Drepper <drepper@redhat.com>
[BZ #10262]

2
nptl/Makefile
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@ -86,7 +86,7 @@ libpthread-routines = nptl-init vars events version \
pthread_barrierattr_setpshared \
pthread_key_create pthread_key_delete \
pthread_getspecific pthread_setspecific \
pthread_sigmask pthread_kill \
pthread_sigmask pthread_kill pthread_sigqueue \
pthread_cancel pthread_testcancel \
pthread_setcancelstate pthread_setcanceltype \
pthread_once \

4
nptl/Versions
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@ -240,6 +240,10 @@ libpthread {
pthread_mutex_getprioceiling; pthread_mutex_setprioceiling;
};
GLIBC_2.11 {
pthread_sigqueue;
};
GLIBC_PRIVATE {
__pthread_initialize_minimal;
__pthread_clock_gettime; __pthread_clock_settime;

8
nptl/sysdeps/pthread/bits/sigthread.h
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@ -1,5 +1,5 @@
/* Signal handling function for threaded programs.
Copyright (C) 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
Copyright (C) 1998, 1999, 2000, 2002, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -35,4 +35,10 @@ extern int pthread_sigmask (int __how,
/* Send signal SIGNO to the given thread. */
extern int pthread_kill (pthread_t __threadid, int __signo) __THROW;
#ifdef __USE_GNU
/* Queue signal and data to a thread. */
extern int pthread_sigqueue (pthread_t __threadid, int __signo,
const union sigval __value) __THROW;
#endif
#endif /* bits/sigthread.h */

83
nptl/sysdeps/unix/sysv/linux/pthread_sigqueue.c Normal file
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@ -0,0 +1,83 @@
/* Copyright (C) 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <pthreadP.h>
#include <tls.h>
#include <sysdep.h>
#include <kernel-features.h>
int
pthread_sigqueue (threadid, signo, value)
pthread_t threadid;
int signo;
const union sigval value;
{
#ifdef __NR_rt_tgsigqueueinfo
struct pthread *pd = (struct pthread *) threadid;
/* Make sure the descriptor is valid. */
if (DEBUGGING_P && INVALID_TD_P (pd))
/* Not a valid thread handle. */
return ESRCH;
/* Force load of pd->tid into local variable or register. Otherwise
if a thread exits between ESRCH test and tgkill, we might return
EINVAL, because pd->tid would be cleared by the kernel. */
pid_t tid = atomic_forced_read (pd->tid);
if (__builtin_expect (tid <= 0, 0))
/* Not a valid thread handle. */
return ESRCH;
/* Disallow sending the signal we use for cancellation, timers, for
for the setxid implementation. */
if (signo == SIGCANCEL || signo == SIGTIMER || signo == SIGSETXID)
return EINVAL;
/* Set up the siginfo_t structure. */
siginfo_t info;
memset (&info, '\0', sizeof (siginfo_t));
info.si_signo = signo;
info.si_code = SI_QUEUE;
info.si_pid = THREAD_GETMEM (THREAD_SELF, pid);
info.si_uid = getuid ();
info.si_value = value;
/* We have a special syscall to do the work. */
INTERNAL_SYSCALL_DECL (err);
/* One comment: The PID field in the TCB can temporarily be changed
(in fork). But this must not affect this code here. Since this
function would have to be called while the thread is executing
fork, it would have to happen in a signal handler. But this is
no allowed, pthread_sigqueue is not guaranteed to be async-safe. */
int val = INTERNAL_SYSCALL (rt_tgsigqueueinfo, err, 4,
THREAD_GETMEM (THREAD_SELF, pid),
tid, signo, &info);
return (INTERNAL_SYSCALL_ERROR_P (val, err)
? INTERNAL_SYSCALL_ERRNO (val, err) : 0);
#else
return ENOSYS;
#endif
}