1a78fbb5c8
Since e19d702b8e, dlsym and friends use recursive mutexes that
require the current thread id, which is not available before the libc
constructor. This prevents us from using dlsym() in .preinit_array.
This change moves TLS initialization from libc constructor to the earliest
possible point - immediately after linker itself is relocated. As a result,
pthread_internal_t for the initial thread is available from the start.
As a bonus, values stored in TLS in .preinit_array are not lost when libc is
initialized.
Change-Id: Iee5a710ee000173bff63e924adeb4a4c600c1e2d
120 lines
4 KiB
C
120 lines
4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _PTHREAD_INTERNAL_H_
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#define _PTHREAD_INTERNAL_H_
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#include <pthread.h>
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__BEGIN_DECLS
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typedef struct pthread_internal_t
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{
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struct pthread_internal_t* next;
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struct pthread_internal_t** pref;
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pthread_attr_t attr;
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pid_t kernel_id;
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pthread_cond_t join_cond;
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int join_count;
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void* return_value;
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int intern;
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__pthread_cleanup_t* cleanup_stack;
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void** tls; /* thread-local storage area */
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} pthread_internal_t;
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extern void _init_thread(pthread_internal_t * thread, pid_t kernel_id, pthread_attr_t * attr, void * stack_base);
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void _pthread_internal_add( pthread_internal_t* thread );
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pthread_internal_t* __get_thread(void);
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/* needed by posix-timers.c */
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static __inline__ void timespec_add( struct timespec* a, const struct timespec* b )
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{
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a->tv_sec += b->tv_sec;
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a->tv_nsec += b->tv_nsec;
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if (a->tv_nsec >= 1000000000) {
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a->tv_nsec -= 1000000000;
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a->tv_sec += 1;
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}
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}
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static __inline__ void timespec_sub( struct timespec* a, const struct timespec* b )
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{
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a->tv_sec -= b->tv_sec;
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a->tv_nsec -= b->tv_nsec;
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if (a->tv_nsec < 0) {
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a->tv_nsec += 1000000000;
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a->tv_sec -= 1;
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}
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}
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static __inline__ void timespec_zero( struct timespec* a )
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{
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a->tv_sec = a->tv_nsec = 0;
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}
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static __inline__ int timespec_is_zero( const struct timespec* a )
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{
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return (a->tv_sec == 0 && a->tv_nsec == 0);
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}
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static __inline__ int timespec_cmp( const struct timespec* a, const struct timespec* b )
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{
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if (a->tv_sec < b->tv_sec) return -1;
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if (a->tv_sec > b->tv_sec) return +1;
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if (a->tv_nsec < b->tv_nsec) return -1;
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if (a->tv_nsec > b->tv_nsec) return +1;
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return 0;
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}
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static __inline__ int timespec_cmp0( const struct timespec* a )
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{
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if (a->tv_sec < 0) return -1;
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if (a->tv_sec > 0) return +1;
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if (a->tv_nsec < 0) return -1;
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if (a->tv_nsec > 0) return +1;
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return 0;
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}
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extern int __pthread_cond_timedwait(pthread_cond_t*,
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pthread_mutex_t*,
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const struct timespec*,
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clockid_t);
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extern int __pthread_cond_timedwait_relative(pthread_cond_t*,
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pthread_mutex_t*,
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const struct timespec*);
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/* needed by fork.c */
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extern void __timer_table_start_stop(int stop);
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extern void __bionic_atfork_run_prepare();
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extern void __bionic_atfork_run_child();
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extern void __bionic_atfork_run_parent();
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__END_DECLS
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#endif /* _PTHREAD_INTERNAL_H_ */
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