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47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Signal a condition. Generic version.
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Copyright (C) 2000-2025 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 <pthread.h>
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#include <shlib-compat.h>
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#include <pt-internal.h>
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/* Unblock at least one of the threads that are blocked on condition
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variable COND. */
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int
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__pthread_cond_signal (pthread_cond_t *cond)
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{
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struct __pthread *wakeup;
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__pthread_spin_wait (&cond->__lock);
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wakeup = cond->__queue;
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if (wakeup != NULL)
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__pthread_dequeue (wakeup);
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__pthread_spin_unlock (&cond->__lock);
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if (wakeup != NULL)
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__pthread_wakeup (wakeup);
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return 0;
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}
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libc_hidden_def (__pthread_cond_signal)
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versioned_symbol (libc, __pthread_cond_signal, pthread_cond_signal, GLIBC_2_21);
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#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_21)
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compat_symbol (libc, __pthread_cond_signal, pthread_cond_signal, GLIBC_2_12);
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#endif
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