From 1d0fc213824eaa2a8f8c4385daaa698ee8fb7c92 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Sat, 2 Feb 2019 15:17:02 +0100 Subject: Linux: Add gettid system call wrapper [BZ #6399] This commit adds gettid to on Linux, and not to the kernel-independent GNU API. gettid is now supportable on Linux because too many things assume a 1:1 mapping between libpthread threads and kernel threads. Reviewed-by: Carlos O'Donell --- sysdeps/unix/sysv/linux/bits/unistd_ext.h | 36 +++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/bits/unistd_ext.h (limited to 'sysdeps/unix/sysv/linux/bits') diff --git a/sysdeps/unix/sysv/linux/bits/unistd_ext.h b/sysdeps/unix/sysv/linux/bits/unistd_ext.h new file mode 100644 index 0000000000..0061172f23 --- /dev/null +++ b/sysdeps/unix/sysv/linux/bits/unistd_ext.h @@ -0,0 +1,36 @@ +/* System-specific extensions of , Linux version. + Copyright (C) 2019 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 + . */ + +#ifndef _UNISTD_H +# error "Never include directly; use instead." +#endif + +#ifdef __USE_GNU + +/* Return the kernel thread ID (TID) of the current thread. The + returned value is not subject to caching. Most Linux system calls + accept a TID in place of a PID. Using the TID to change properties + of a thread that has been created using pthread_create can lead to + undefined behavior (comparable to manipulating file descriptors + directly that have not been created explicitly). Note that a TID + uniquely identifies a thread only while this thread is running; a + TID can be reused once a thread has exited, even if the thread is + not detached and has not been joined. */ +extern __pid_t gettid (void) __THROW; + +#endif -- cgit 1.4.1