diff options
Diffstat (limited to 'sysdeps/unix/sysv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/futex-internal.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/lowlevellock-futex.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/single-thread.h | 62 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/sysdep-cancel.h | 81 |
4 files changed, 106 insertions, 41 deletions
diff --git a/sysdeps/unix/sysv/linux/futex-internal.h b/sysdeps/unix/sysv/linux/futex-internal.h index 55f0fab77c..501f993853 100644 --- a/sysdeps/unix/sysv/linux/futex-internal.h +++ b/sysdeps/unix/sysv/linux/futex-internal.h @@ -22,7 +22,7 @@ #include <sysdeps/nptl/futex-internal.h> #include <errno.h> #include <lowlevellock-futex.h> -#include <nptl/pthreadP.h> +#include <sysdep-cancel.h> /* See sysdeps/nptl/futex-internal.h for documentation; this file only contains Linux-specific comments. diff --git a/sysdeps/unix/sysv/linux/lowlevellock-futex.h b/sysdeps/unix/sysv/linux/lowlevellock-futex.h index 6f060b1739..030a14b8dc 100644 --- a/sysdeps/unix/sysv/linux/lowlevellock-futex.h +++ b/sysdeps/unix/sysv/linux/lowlevellock-futex.h @@ -21,7 +21,7 @@ #ifndef __ASSEMBLER__ #include <sysdep.h> -#include <tls.h> +#include <sysdep-cancel.h> #include <kernel-features.h> #endif diff --git a/sysdeps/unix/sysv/linux/single-thread.h b/sysdeps/unix/sysv/linux/single-thread.h new file mode 100644 index 0000000000..2c972f37b3 --- /dev/null +++ b/sysdeps/unix/sysv/linux/single-thread.h @@ -0,0 +1,62 @@ +/* Single thread optimization, 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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _SINGLE_THREAD_H +#define _SINGLE_THREAD_H + +/* The default way to check if the process is single thread is by using the + pthread_t 'multiple_threads' field. However, for some architectures it is + faster to either use an extra field on TCB or global variables (the TCB + field is also used on x86 for some single-thread atomic optimizations). + + The ABI might define SINGLE_THREAD_BY_GLOBAL to enable the single thread + check to use global variables instead of the pthread_t field. */ + +#ifdef SINGLE_THREAD_BY_GLOBAL +# if IS_IN (libc) +extern int __libc_multiple_threads; +# define SINGLE_THREAD_P \ + __glibc_likely (__libc_multiple_threads == 0) +# elif IS_IN (libpthread) +extern int __pthread_multiple_threads; +# define SINGLE_THREAD_P \ + __glibc_likely (__pthread_multiple_threads == 0) +# elif IS_IN (librt) +# define SINGLE_THREAD_P \ + __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ + header.multiple_threads) == 0) +# else +/* For rtld, et cetera. */ +# define SINGLE_THREAD_P (1) +# endif +#else /* SINGLE_THREAD_BY_GLOBAL */ +# if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt) +# define SINGLE_THREAD_P \ + __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ + header.multiple_threads) == 0) +# else +/* For rtld, et cetera. */ +# define SINGLE_THREAD_P (1) +# endif +#endif /* SINGLE_THREAD_BY_GLOBAL */ + +#define RTLD_SINGLE_THREAD_P \ + __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ + header.multiple_threads) == 0) + +#endif /* _SINGLE_THREAD_H */ diff --git a/sysdeps/unix/sysv/linux/sysdep-cancel.h b/sysdeps/unix/sysv/linux/sysdep-cancel.h index 896549c7f7..a831b30106 100644 --- a/sysdeps/unix/sysv/linux/sysdep-cancel.h +++ b/sysdeps/unix/sysv/linux/sysdep-cancel.h @@ -17,48 +17,51 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#ifndef _SYSDEP_CANCEL_H +#define _SYSDEP_CANCEL_H + #include <sysdep.h> #include <tls.h> -#include <nptl/pthreadP.h> +#include <errno.h> + +/* The two functions are in libc.so and not exported. */ +extern int __libc_enable_asynccancel (void) attribute_hidden; +extern void __libc_disable_asynccancel (int oldtype) attribute_hidden; + +/* The two functions are in librt.so and not exported. */ +extern int __librt_enable_asynccancel (void) attribute_hidden; +extern void __librt_disable_asynccancel (int oldtype) attribute_hidden; + +/* The two functions are in libpthread.so and not exported. */ +extern int __pthread_enable_asynccancel (void) attribute_hidden; +extern void __pthread_disable_asynccancel (int oldtype) attribute_hidden; -/* The default way to check if the process is single thread is by using the - pthread_t 'multiple_threads' field. However for some architectures it - is faster to either use an extra field on TCB or global varibles - (the TCB field is also used on x86 for some single-thread atomic - optimizations). +/* Set cancellation mode to asynchronous. */ +#define CANCEL_ASYNC() \ + __pthread_enable_asynccancel () +/* Reset to previous cancellation mode. */ +#define CANCEL_RESET(oldtype) \ + __pthread_disable_asynccancel (oldtype) - The ABI might define SINGLE_THREAD_BY_GLOBAL to enable the single - thread check to use global variables instead of the pthread_t - field. */ +#if IS_IN (libc) +/* Same as CANCEL_ASYNC, but for use in libc.so. */ +# define LIBC_CANCEL_ASYNC() \ + __libc_enable_asynccancel () +/* Same as CANCEL_RESET, but for use in libc.so. */ +# define LIBC_CANCEL_RESET(oldtype) \ + __libc_disable_asynccancel (oldtype) +#elif IS_IN (libpthread) +# define LIBC_CANCEL_ASYNC() CANCEL_ASYNC () +# define LIBC_CANCEL_RESET(val) CANCEL_RESET (val) +#elif IS_IN (librt) +# define LIBC_CANCEL_ASYNC() \ + __librt_enable_asynccancel () +# define LIBC_CANCEL_RESET(val) \ + __librt_disable_asynccancel (val) +#else +# define LIBC_CANCEL_ASYNC() 0 /* Just a dummy value. */ +# define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it. */ +#endif -#ifdef SINGLE_THREAD_BY_GLOBAL -# if IS_IN (libc) -extern int __libc_multiple_threads; -# define SINGLE_THREAD_P \ - __glibc_likely (__libc_multiple_threads == 0) -# elif IS_IN (libpthread) -extern int __pthread_multiple_threads; -# define SINGLE_THREAD_P \ - __glibc_likely (__pthread_multiple_threads == 0) -# elif IS_IN (librt) -# define SINGLE_THREAD_P \ - __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ - header.multiple_threads) == 0) -# else -/* For rtld, et cetera. */ -# define SINGLE_THREAD_P (1) -# endif -#else /* SINGLE_THREAD_BY_GLOBAL */ -# if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt) -# define SINGLE_THREAD_P \ - __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ - header.multiple_threads) == 0) -# else -/* For rtld, et cetera. */ -# define SINGLE_THREAD_P (1) -# endif -#endif /* SINGLE_THREAD_BY_GLOBAL */ -#define RTLD_SINGLE_THREAD_P \ - __glibc_likely (THREAD_GETMEM (THREAD_SELF, \ - header.multiple_threads) == 0) +#endif |