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/* Copyright (C) 2002-2026 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
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, see
<https://www.gnu.org/licenses/>. */
#include "pthreadP.h"
#include <shlib-compat.h>
int
__pthread_tryjoin_np (pthread_t threadid, void **thread_return)
{
/* The joinable state (THREAD_STATE_JOINABLE) is straightforward: the thread
hasn't finished yet, so trying to join might block.
The exiting thread (THREAD_STATE_EXITING) also might result in a blocking
call: a detached thread might change its state to exiting, and an exiting
thread might take some time to exit (and thus let the kernel set the
state to THREAD_STATE_EXITED).
The ‘joinstate’ does not change during the thread lifetime once the
kernel sets it to THREAD_STATE_EXITED. The __pthread_clockjoin_ex will
only call the cancellable futex if state is not THREAD_STATE_EXITED, so
calling it should be safe wrt not making pthread_tryjoin_np a
cancellable entrypoint (since it is marked as __THROW). */
struct pthread *pd = (struct pthread *) threadid;
return atomic_load_acquire (&pd->joinstate) != THREAD_STATE_EXITED
? EBUSY
: __pthread_clockjoin_ex (threadid, thread_return, 0, NULL, false);
}
versioned_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
compat_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_3_3);
#endif
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