mirror of git://sourceware.org/git/glibc.git
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* Common definition for pthread_{timed,try}join{_np}.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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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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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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<https://www.gnu.org/licenses/>. */
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#include "pthreadP.h"
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#include <atomic.h>
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#include <stap-probe.h>
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#include <time.h>
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#include <futex-internal.h>
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int
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__pthread_clockjoin_ex (pthread_t threadid, void **thread_return,
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clockid_t clockid,
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const struct __timespec64 *abstime,
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bool cancel)
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{
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struct pthread *pd = (struct pthread *) threadid;
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/* Make sure the clock and time specified are valid. */
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if (abstime
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&& __glibc_unlikely (!futex_abstimed_supported_clockid (clockid)
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|| ! valid_nanoseconds (abstime->tv_nsec)))
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return EINVAL;
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LIBC_PROBE (pthread_join, 1, threadid);
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int result = 0;
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unsigned int state;
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while ((state = atomic_load_acquire (&pd->joinstate))
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!= THREAD_STATE_EXITED)
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{
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struct pthread *self = THREAD_SELF;
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if (pd == self
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&& !cancel_enabled_and_canceled (self->cancelhandling))
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return EDEADLK;
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/* POSIX states calling pthread_join on a non joinable thread is
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undefined. However, if PD is still in the cache we can warn
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the caller. */
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if (state == THREAD_STATE_DETACHED)
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return EINVAL;
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/* pthread_join is a cancellation entrypoint and we use the same
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rationale for pthread_timedjoin_np.
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The kernel notifies a process which uses CLONE_CHILD_CLEARTID via
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a memory zeroing and futex wake-up when the process terminates.
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The futex operation is not private. */
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int ret = cancel
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? __futex_abstimed_wait_cancelable64 (&pd->joinstate, state, clockid,
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abstime, LLL_SHARED)
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: __futex_abstimed_wait64 (&pd->joinstate, state, clockid, abstime,
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LLL_SHARED);
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if (ret == ETIMEDOUT || ret == EOVERFLOW)
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{
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result = ret;
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break;
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}
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}
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void *pd_result = pd->result;
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if (__glibc_likely (result == 0))
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{
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if (thread_return != NULL)
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*thread_return = pd_result;
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/* Free the TCB. */
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__nptl_free_tcb (pd);
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}
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LIBC_PROBE (pthread_join_ret, 3, threadid, result, pd_result);
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return result;
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}
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