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ce7528f637
This patch adds the thrd_* definitions from C11 threads (ISO/IEC 9899:2011),
more specifically thrd_create, thrd_curent, rhd_detach, thrd_equal,
thrd_exit, thrd_join, thrd_sleep, thrd_yield, and required types.
Mostly of the definitions are composed based on POSIX conterparts, such as
thrd_t (using pthread_t). For thrd_* function internally direct
POSIX pthread call are used with the exceptions:
1. thrd_start uses pthread_create internal implementation, but changes
how to actually calls the start routine. This is due the difference
in signature between POSIX and C11, where former return a 'void *'
and latter 'int'.
To avoid calling convention issues due 'void *' to int cast, routines
from C11 threads are started slight different than default pthread one.
Explicit cast to expected return are used internally on pthread_create
and the result is stored back to void also with an explicit cast.
2. thrd_sleep uses nanosleep internal direct syscall to avoid clobbering
errno and to handle expected standard return codes. It is a
cancellation entrypoint to be consistent with both thrd_join and
cnd_{timed}wait.
3. thrd_yield also uses internal direct syscall to avoid errno clobbering.
Checked with a build for all major ABI (aarch64-linux-gnu, alpha-linux-gnu,
arm-linux-gnueabi, i386-linux-gnu, ia64-linux-gnu, m68k-linux-gnu,
microblaze-linux-gnu [1], mips{64}-linux-gnu, nios2-linux-gnu,
powerpc{64le}-linux-gnu, s390{x}-linux-gnu, sparc{64}-linux-gnu,
and x86_64-linux-gnu).
Also ran a full check on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu,
arm-linux-gnueabhf, and powerpc64le-linux-gnu.
[BZ #14092]
* conform/Makefile (conformtest-headers-ISO11): Add threads.h.
(linknamespace-libs-ISO11): Add libpthread.a.
* conform/data/threads.h-data: New file: add C11 thrd_* types and
functions.
* include/stdc-predef.h (__STDC_NO_THREADS__): Remove definition.
* nptl/Makefile (headers): Add threads.h.
(libpthread-routines): Add new C11 thread thrd_create, thrd_current,
thrd_detach, thrd_equal, thrd_exit, thrd_join, thrd_sleep, and
thrd_yield.
* nptl/Versions (libpthread) [GLIBC_2.28]): Add new C11 thread
thrd_create, thrd_current, thrd_detach, thrd_equal, thrd_exit,
thrd_join, thrd_sleep, and thrd_yield symbols.
* nptl/descr.h (struct pthread): Add c11 field.
* nptl/pthreadP.h (ATTR_C11_THREAD): New define.
* nptl/pthread_create.c (START_THREAD_DEFN): Call C11 thread start
routine with expected function prototype.
(__pthread_create_2_1): Add C11 threads check based on attribute
value.
* sysdeps/unix/sysdep.h (INTERNAL_SYSCALL_CANCEL): New macro.
* nptl/thrd_create.c: New file.
* nptl/thrd_current.c: Likewise.
* nptl/thrd_detach.c: Likewise.
* nptl/thrd_equal.c: Likewise.
* nptl/thrd_exit.c: Likewise.
* nptl/thrd_join.c: Likewise.
* nptl/thrd_priv.h: Likewise.
* nptl/thrd_sleep.c: Likewise.
* nptl/thrd_yield.c: Likewise.
* include/threads.h: Likewise.
149 lines
5.9 KiB
C
149 lines
5.9 KiB
C
/* Copyright (C) 1991-2018 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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<http://www.gnu.org/licenses/>. */
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#include <sysdeps/generic/sysdep.h>
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#include <sys/syscall.h>
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#define HAVE_SYSCALLS
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/* Note that using a `PASTE' macro loses. */
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#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
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#define SYSCALL(name, args) PSEUDO (name, name, args)
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#define __SYSCALL_CONCAT_X(a,b) a##b
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#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b)
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#define __INTERNAL_SYSCALL0(name, err) \
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INTERNAL_SYSCALL (name, err, 0)
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#define __INTERNAL_SYSCALL1(name, err, a1) \
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INTERNAL_SYSCALL (name, err, 1, a1)
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#define __INTERNAL_SYSCALL2(name, err, a1, a2) \
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INTERNAL_SYSCALL (name, err, 2, a1, a2)
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#define __INTERNAL_SYSCALL3(name, err, a1, a2, a3) \
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INTERNAL_SYSCALL (name, err, 3, a1, a2, a3)
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#define __INTERNAL_SYSCALL4(name, err, a1, a2, a3, a4) \
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INTERNAL_SYSCALL (name, err, 4, a1, a2, a3, a4)
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#define __INTERNAL_SYSCALL5(name, err, a1, a2, a3, a4, a5) \
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INTERNAL_SYSCALL (name, err, 5, a1, a2, a3, a4, a5)
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#define __INTERNAL_SYSCALL6(name, err, a1, a2, a3, a4, a5, a6) \
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INTERNAL_SYSCALL (name, err, 6, a1, a2, a3, a4, a5, a6)
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#define __INTERNAL_SYSCALL7(name, err, a1, a2, a3, a4, a5, a6, a7) \
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INTERNAL_SYSCALL (name, err, 7, a1, a2, a3, a4, a5, a6, a7)
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#define __INTERNAL_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,o,...) o
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#define __INTERNAL_SYSCALL_NARGS(...) \
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__INTERNAL_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
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#define __INTERNAL_SYSCALL_DISP(b,...) \
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__SYSCALL_CONCAT (b,__INTERNAL_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
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/* Issue a syscall defined by syscall number plus any other argument required.
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It is similar to INTERNAL_SYSCALL macro, but without the need to pass the
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expected argument number as second parameter. */
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#define INTERNAL_SYSCALL_CALL(...) \
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__INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL, __VA_ARGS__)
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#define __INLINE_SYSCALL0(name) \
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INLINE_SYSCALL (name, 0)
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#define __INLINE_SYSCALL1(name, a1) \
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INLINE_SYSCALL (name, 1, a1)
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#define __INLINE_SYSCALL2(name, a1, a2) \
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INLINE_SYSCALL (name, 2, a1, a2)
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#define __INLINE_SYSCALL3(name, a1, a2, a3) \
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INLINE_SYSCALL (name, 3, a1, a2, a3)
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#define __INLINE_SYSCALL4(name, a1, a2, a3, a4) \
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INLINE_SYSCALL (name, 4, a1, a2, a3, a4)
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#define __INLINE_SYSCALL5(name, a1, a2, a3, a4, a5) \
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INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5)
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#define __INLINE_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \
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INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6)
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#define __INLINE_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \
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INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7)
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#define __INLINE_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
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#define __INLINE_SYSCALL_NARGS(...) \
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__INLINE_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,)
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#define __INLINE_SYSCALL_DISP(b,...) \
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__SYSCALL_CONCAT (b,__INLINE_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
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/* Issue a syscall defined by syscall number plus any other argument
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required. Any error will be handled using arch defined macros and errno
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will be set accordingly.
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It is similar to INLINE_SYSCALL macro, but without the need to pass the
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expected argument number as second parameter. */
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#define INLINE_SYSCALL_CALL(...) \
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__INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__)
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#define SYSCALL_CANCEL(...) \
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({ \
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long int sc_ret; \
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if (SINGLE_THREAD_P) \
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sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
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else \
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{ \
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int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
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sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
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LIBC_CANCEL_RESET (sc_cancel_oldtype); \
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} \
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sc_ret; \
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})
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/* Issue a syscall defined by syscall number plus any other argument
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required. Any error will be returned unmodified (including errno). */
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#define INTERNAL_SYSCALL_CANCEL(...) \
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({ \
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long int sc_ret; \
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if (SINGLE_THREAD_P) \
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sc_ret = INTERNAL_SYSCALL_CALL (__VA_ARGS__); \
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else \
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{ \
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int sc_cancel_oldtype = LIBC_CANCEL_ASYNC (); \
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sc_ret = INTERNAL_SYSCALL_CALL (__VA_ARGS__); \
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LIBC_CANCEL_RESET (sc_cancel_oldtype); \
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} \
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sc_ret; \
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})
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/* Machine-dependent sysdep.h files are expected to define the macro
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PSEUDO (function_name, syscall_name) to emit assembly code to define the
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C-callable function FUNCTION_NAME to do system call SYSCALL_NAME.
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r0 and r1 are the system call outputs. MOVE(x, y) should be defined as
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an instruction such that "MOVE(r1, r0)" works. ret should be defined
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as the return instruction. */
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#ifndef SYS_ify
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#define SYS_ify(syscall_name) SYS_##syscall_name
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#endif
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/* Terminate a system call named SYM. This is used on some platforms
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to generate correct debugging information. */
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#ifndef PSEUDO_END
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#define PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym)
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#endif
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#ifndef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym)
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#endif
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/* Wrappers around system calls should normally inline the system call code.
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But sometimes it is not possible or implemented and we use this code. */
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#ifndef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args)
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#endif
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