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https://github.com/zephyrproject-rtos/zephyr
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746c59c82a
Up until now, the `__thread` keyword has been used for declaring variables as Thread local storage. However, `__thread` is a GNU specific keyword which thus limits compatibility with other toolchains (for instance IAR). This PR intoduces a new macro `Z_THREAD_LOCAL` which expands to the corresponding C11, C23 or C++11 standard keyword based on the standard that is specified during compilation, else it uses the old `__thread` keyword. Signed-off-by: Daniel Flodin <daniel.flodin@iar.com>
58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
/*
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* Copyright (c) 2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/** @file
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*
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* @brief Per-thread errno accessor function
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*
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* Allow accessing the errno for the current thread without involving the
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* context switching.
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/internal/syscall_handler.h>
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/*
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* Define _k_neg_eagain for use in assembly files as errno.h is
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* not assembly language safe.
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* FIXME: wastes 4 bytes
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*/
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const int _k_neg_eagain = -EAGAIN;
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#ifdef CONFIG_ERRNO
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#if defined(CONFIG_LIBC_ERRNO)
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/* nothing needed here */
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#elif defined(CONFIG_ERRNO_IN_TLS)
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Z_THREAD_LOCAL int z_errno_var;
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#else
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#ifdef CONFIG_USERSPACE
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int *z_impl_z_errno(void)
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{
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/* Initialized to the lowest address in the stack so the thread can
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* directly read/write it
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*/
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return &_current->userspace_local_data->errno_var;
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}
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static inline int *z_vrfy_z_errno(void)
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{
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return z_impl_z_errno();
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}
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#include <zephyr/syscalls/z_errno_mrsh.c>
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#else
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int *z_impl_z_errno(void)
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{
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return &_current->errno_var;
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}
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#endif /* CONFIG_USERSPACE */
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#endif /* CONFIG_ERRNO_IN_TLS */
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#endif /* CONFIG_ERRNO */
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