58 lines
2.4 KiB
C++
58 lines
2.4 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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#include <pthread.h>
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#include "pthread_internal.h"
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#include "private/bionic_tls.h"
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// This trampoline is called from the assembly _pthread_clone function.
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// Our 'tls' and __pthread_clone's 'child_stack' are one and the same, just growing in
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// opposite directions.
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extern "C" void __thread_entry(void* (*func)(void*), void* arg, void** tls) {
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// Wait for our creating thread to release us. This lets it have time to
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// notify gdb about this thread before we start doing anything.
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// This also provides the memory barrier needed to ensure that all memory
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// accesses previously made by the creating thread are visible to us.
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pthread_mutex_t* start_mutex = (pthread_mutex_t*) &tls[TLS_SLOT_SELF];
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pthread_mutex_lock(start_mutex);
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pthread_mutex_destroy(start_mutex);
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pthread_internal_t* thread = (pthread_internal_t*) tls[TLS_SLOT_THREAD_ID];
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thread->tls = tls;
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__init_tls(thread);
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if ((thread->internal_flags & PTHREAD_INTERNAL_FLAG_THREAD_INIT_FAILED) != 0) {
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pthread_exit(NULL);
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}
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void* result = func(arg);
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pthread_exit(result);
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}
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