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1d0fc213 | 1 | /* System-specific extensions of <unistd.h>, Linux version. |
d614a753 | 2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. |
1d0fc213 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1d0fc213 FW |
18 | |
19 | #ifndef _UNISTD_H | |
20 | # error "Never include <bits/unistd_ext.h> directly; use <unistd.h> instead." | |
21 | #endif | |
22 | ||
23 | #ifdef __USE_GNU | |
24 | ||
25 | /* Return the kernel thread ID (TID) of the current thread. The | |
26 | returned value is not subject to caching. Most Linux system calls | |
27 | accept a TID in place of a PID. Using the TID to change properties | |
28 | of a thread that has been created using pthread_create can lead to | |
29 | undefined behavior (comparable to manipulating file descriptors | |
30 | directly that have not been created explicitly). Note that a TID | |
31 | uniquely identifies a thread only while this thread is running; a | |
32 | TID can be reused once a thread has exited, even if the thread is | |
33 | not detached and has not been joined. */ | |
34 | extern __pid_t gettid (void) __THROW; | |
35 | ||
36 | #endif |