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fa872e1b62
This patch adds internal definition (through {libc_}hidden_{proto,def}) and
also change some strong to weak alias for symbols that might be used by C11
threads implementations.
The patchset should not change libc/libpthread functional, although object
changes are expected (since now internal symbols are used instead) and final
exported symbols through GLIBC_PRIVATE is also expanded (to cover libpthread
usage of __mmap{64}, __munmap, __mprotect).
Checked with a build for all major ABI (aarch64-linux-gnu, alpha-linux-gnu,
arm-linux-gnueabi, i386-linux-gnu, ia64-linux-gnu, m68k-linux-gnu,
microblaze-linux-gnu [1], mips{64}-linux-gnu, nios2-linux-gnu,
powerpc{64le}-linux-gnu, s390{x}-linux-gnu, sparc{64}-linux-gnu,
tile{pro,gx}-linux-gnu, and x86_64-linux-gnu).
* include/sched.h (__sched_get_priority_max): Add libc hidden proto.
(__sched_get_prioriry_min): Likewise.
* include/sys/mman.h (__mmap): Likewise.
(__mmap64): Likewise.
(__munmap): Likewise.
(__mprotect): Likewise.
* include/termios.h (__tcsetattr): Likewise.
* include/time.h (__nanosleep): Use hidden_proto instead of
libc_hidden_proto.
* posix/nanosleep.c (__nanosleep): Likewise.
* misc/Versions (libc): Export __mmap, __munmap, __mprotect,
__sched_get_priority_min, and __sched_get_priority_max under
GLIBC_PRIVATE.
* nptl/allocatestack.c (__free_stacks): Use internal definition for
libc symbols.
(change_stack_perm): Likewise.
(allocate_stack): Likewise.
* sysdeps/posix/gethostname.c: Likewise.
* nptl/tpp.c (__init_sched_fifo_prio): Likewise.
* sysdeps/unix/sysv/linux/i386/smp.h (is_smp_system): Likewise.
* sysdeps/unix/sysv/linux/powerpc/ioctl.c (__ioctl): Likewise.
* nptl/pthreadP.h (__pthread_mutex_timedlock): Add definition.
(__pthread_key_delete): Likewise.
(__pthread_detach): Likewise.
(__pthread_cancel): Likewise.
(__pthread_mutex_trylock): Likewise.
(__pthread_mutexattr_init): Likewise.
(__pthread_mutexattr_settype): Likewise.
* nptl/pthread_cancel.c (pthread_cancel): Change to internal name and
create alias for exported one.
* nptl/pthread_join.c (pthread_join): Likewise.
* nptl/pthread_detach.c (pthread_detach): Likewise.
* nptl/pthread_key_delete.c (pthread_key_delete): Likewise.
* nptl/pthread_mutex_timedlock.c (pthread_mutex_timedlock): Likewise.
* nptl/pthread_create.c: Change static requirements for pthread
symbols.
* nptl/pthread_equal.c (__pthread_equal): Change strong alias to weak
for internal definition.
* nptl/pthread_exit.c (__pthread_exit): Likewise.
* nptl/pthread_getspecific.c (__pthread_getspecific): Likewise.
* nptl/pthread_key_create.c (__pthread_key_create): Likewise.
* nptl/pthread_mutex_destroy.c (__pthread_mutex_destroy): Likewise.
* nptl/pthread_mutex_init.c (__pthread_mutex_init): Likewise.
* nptl/pthread_mutex_lock.c (__pthread_mutex_lock): Likewise.
* nptl/pthread_mutex_trylock.c (__pthread_mutex_trylock): Likewise.
* nptl/pthread_mutex_unlock.c (__pthread_mutex_unlock): Likewise.
* nptl/pthread_mutexattr_init.c (__pthread_mutexattr_init): Likwise.
* nptl/pthread_mutexattr_settype.c (__pthread_mutexattr_settype):
Likewise.
* nptl/pthread_self.c (__pthread_self): Likewise.
* nptl/pthread_setspecific.c (__pthread_setspecific): Likewise.
* sysdeps/unix/sysv/linux/tcsetattr.c (tcsetattr): Likewise.
* misc/mmap.c (__mmap): Add internal symbol definition.
* misc/mmap.c (__mmap64): Likewise.
* sysdeps/unix/sysv/linux/mmap.c (__mmap): Likewise.
* sysdeps/unix/sysv/linux/mmap64.c (__mmap): Likewise.
(__mmap64): Likewise.
* sysdeps/unix/sysv/linux/i386/Versions (libc) [GLIBC_PRIVATE):
Add __uname.
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include "pthreadP.h"
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#include <atomic.h>
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#include <sysdep.h>
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#include <unistd.h>
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int
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__pthread_cancel (pthread_t th)
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{
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volatile struct pthread *pd = (volatile struct pthread *) th;
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/* Make sure the descriptor is valid. */
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if (INVALID_TD_P (pd))
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/* Not a valid thread handle. */
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return ESRCH;
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#ifdef SHARED
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pthread_cancel_init ();
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#endif
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int result = 0;
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int oldval;
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int newval;
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do
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{
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again:
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oldval = pd->cancelhandling;
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newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK;
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/* Avoid doing unnecessary work. The atomic operation can
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potentially be expensive if the bug has to be locked and
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remote cache lines have to be invalidated. */
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if (oldval == newval)
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break;
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/* If the cancellation is handled asynchronously just send a
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signal. We avoid this if possible since it's more
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expensive. */
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if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval))
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{
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/* Mark the cancellation as "in progress". */
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if (atomic_compare_and_exchange_bool_acq (&pd->cancelhandling,
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oldval | CANCELING_BITMASK,
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oldval))
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goto again;
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#ifdef SIGCANCEL
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/* The cancellation handler will take care of marking the
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thread as canceled. */
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pid_t pid = __getpid ();
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INTERNAL_SYSCALL_DECL (err);
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int val = INTERNAL_SYSCALL_CALL (tgkill, err, pid, pd->tid,
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SIGCANCEL);
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if (INTERNAL_SYSCALL_ERROR_P (val, err))
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result = INTERNAL_SYSCALL_ERRNO (val, err);
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#else
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/* It should be impossible to get here at all, since
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pthread_setcanceltype should never have allowed
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PTHREAD_CANCEL_ASYNCHRONOUS to be set. */
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abort ();
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#endif
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break;
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}
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/* A single-threaded process should be able to kill itself, since
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there is nothing in the POSIX specification that says that it
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cannot. So we set multiple_threads to true so that cancellation
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points get executed. */
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THREAD_SETMEM (THREAD_SELF, header.multiple_threads, 1);
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#ifndef TLS_MULTIPLE_THREADS_IN_TCB
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__pthread_multiple_threads = *__libc_multiple_threads_ptr = 1;
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#endif
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}
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/* Mark the thread as canceled. This has to be done
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atomically since other bits could be modified as well. */
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while (atomic_compare_and_exchange_bool_acq (&pd->cancelhandling, newval,
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oldval));
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return result;
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}
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weak_alias (__pthread_cancel, pthread_cancel)
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PTHREAD_STATIC_FN_REQUIRE (__pthread_create)
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