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37 lines
1.6 KiB
37 lines
1.6 KiB
/* System-specific extensions of <unistd.h>, Linux version.
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Copyright (C) 2019-2021 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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#ifndef _UNISTD_H
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# error "Never include <bits/unistd_ext.h> directly; use <unistd.h> instead."
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#endif
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#ifdef __USE_GNU
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/* Return the kernel thread ID (TID) of the current thread. The
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returned value is not subject to caching. Most Linux system calls
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accept a TID in place of a PID. Using the TID to change properties
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of a thread that has been created using pthread_create can lead to
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undefined behavior (comparable to manipulating file descriptors
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directly that have not been created explicitly). Note that a TID
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uniquely identifies a thread only while this thread is running; a
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TID can be reused once a thread has exited, even if the thread is
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not detached and has not been joined. */
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extern __pid_t gettid (void) __THROW;
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#endif
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