2018-04-02 07:43:22 +08:00
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/* Deallocate a thread structure.
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2020-01-01 08:14:33 +08:00
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Copyright (C) 2000-2020 Free Software Foundation, Inc.
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2018-04-02 07:43:22 +08:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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2018-04-02 22:37:36 +08:00
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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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2018-04-02 07:43:22 +08:00
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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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2018-04-02 22:37:36 +08:00
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Lesser General Public License for more details.
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2018-04-02 07:43:22 +08:00
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2018-04-02 22:37:36 +08:00
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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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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 13:40:42 +08:00
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<https://www.gnu.org/licenses/>. */
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2018-04-02 07:43:22 +08:00
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#include <assert.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <pt-internal.h>
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#include <atomic.h>
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/* List of thread structures corresponding to free thread IDs. */
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extern struct __pthread *__pthread_free_threads;
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extern pthread_mutex_t __pthread_free_threads_lock;
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/* Deallocate the thread structure for PTHREAD. */
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void
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__pthread_dealloc (struct __pthread *pthread)
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{
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assert (pthread->state != PTHREAD_TERMINATED);
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if (!atomic_decrement_and_test (&pthread->nr_refs))
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return;
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/* Withdraw this thread from the thread ID lookup table. */
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__pthread_setid (pthread->thread, NULL);
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/* Mark the thread as terminated. We broadcast the condition
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here to prevent pthread_join from waiting for this thread to
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exit where it was never really started. Such a call to
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pthread_join is completely bogus, but unfortunately allowed
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by the standards. */
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__pthread_mutex_lock (&pthread->state_lock);
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if (pthread->state != PTHREAD_EXITED)
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__pthread_cond_broadcast (&pthread->state_cond);
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__pthread_mutex_unlock (&pthread->state_lock);
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/* We do not actually deallocate the thread structure, but add it to
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a list of re-usable thread structures. */
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__pthread_mutex_lock (&__pthread_free_threads_lock);
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__pthread_enqueue (&__pthread_free_threads, pthread);
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__pthread_mutex_unlock (&__pthread_free_threads_lock);
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/* Setting PTHREAD->STATE to PTHREAD_TERMINATED makes this TCB
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available for reuse. After that point, we can no longer assume
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that PTHREAD is valid.
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Note that it is safe to not lock this update to PTHREAD->STATE:
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the only way that it can now be accessed is in __pthread_alloc,
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which reads this variable. */
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pthread->state = PTHREAD_TERMINATED;
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}
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