mirror of
https://github.com/fluencelabs/musl
synced 2025-06-29 22:51:55 +00:00
d56460c939
this both allows removal of some of the main remaining uses of the SHARED macro and clears one obstacle to static-linked dlopen support, which may be added at some point in the future. specialized single-TLS-module versions of __copy_tls and __reset_tls are removed and replaced with code adapted from their dynamic-linked versions, capable of operating on a whole chain of TLS modules, and use of the dynamic linker's DSO chain (which contains large struct dso objects) by these functions is replaced with a new chain of struct tls_module objects containing only the information needed for implementing TLS. this may also yield some performance benefit initializing TLS for a new thread when a large number of modules without TLS have been loaded, since since there is no need to walk structures for modules without TLS.
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
#ifndef LIBC_H
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#define LIBC_H
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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struct __locale_map;
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struct __locale_struct {
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const struct __locale_map *volatile cat[6];
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};
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struct tls_module {
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struct tls_module *next;
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void *image;
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size_t len, size, align, offset;
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};
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struct __libc {
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int can_do_threads;
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int threaded;
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int secure;
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volatile int threads_minus_1;
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size_t *auxv;
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struct tls_module *tls_head;
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size_t tls_size, tls_align, tls_cnt;
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size_t page_size;
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struct __locale_struct global_locale;
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};
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#ifndef PAGE_SIZE
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#define PAGE_SIZE libc.page_size
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#endif
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#ifdef __PIC__
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#define ATTR_LIBC_VISIBILITY __attribute__((visibility("hidden")))
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#else
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#define ATTR_LIBC_VISIBILITY
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#endif
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extern struct __libc __libc ATTR_LIBC_VISIBILITY;
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#define libc __libc
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extern size_t __hwcap ATTR_LIBC_VISIBILITY;
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extern size_t __sysinfo ATTR_LIBC_VISIBILITY;
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extern char *__progname, *__progname_full;
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/* Designed to avoid any overhead in non-threaded processes */
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void __lock(volatile int *) ATTR_LIBC_VISIBILITY;
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void __unlock(volatile int *) ATTR_LIBC_VISIBILITY;
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int __lockfile(FILE *) ATTR_LIBC_VISIBILITY;
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void __unlockfile(FILE *) ATTR_LIBC_VISIBILITY;
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#define LOCK(x) __lock(x)
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#define UNLOCK(x) __unlock(x)
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void __synccall(void (*)(void *), void *);
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int __setxid(int, int, int, int);
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extern char **__environ;
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#undef weak_alias
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#define weak_alias(old, new) \
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extern __typeof(old) new __attribute__((weak, alias(#old)))
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#undef LFS64_2
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#define LFS64_2(x, y) weak_alias(x, y)
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#undef LFS64
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#define LFS64(x) LFS64_2(x, x##64)
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#endif
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