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ba384f6ed9
This feature is specifically for the C++ compiler to offload calling thread_local object destructors on thread program exit, to glibc. This is to overcome the possible complication of destructors of thread_local objects getting called after the DSO in which they're defined is unloaded by the dynamic linker. The DSO is marked as 'unloadable' if it has a constructed thread_local object and marked as 'unloadable' again when all the constructed thread_local objects defined in it are destroyed.
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* Copyright (C) 1991-2013 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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include "exit.h"
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#include "set-hooks.h"
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DEFINE_HOOK (__libc_atexit, (void))
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/* Call all functions registered with `atexit' and `on_exit',
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in the reverse of the order in which they were registered
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perform stdio cleanup, and terminate program execution with STATUS. */
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void
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attribute_hidden
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__run_exit_handlers (int status, struct exit_function_list **listp,
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bool run_list_atexit)
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{
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/* First, call the TLS destructors. */
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__call_tls_dtors ();
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/* We do it this way to handle recursive calls to exit () made by
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the functions registered with `atexit' and `on_exit'. We call
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everyone on the list and use the status value in the last
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exit (). */
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while (*listp != NULL)
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{
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struct exit_function_list *cur = *listp;
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while (cur->idx > 0)
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{
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const struct exit_function *const f =
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&cur->fns[--cur->idx];
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switch (f->flavor)
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{
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void (*atfct) (void);
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void (*onfct) (int status, void *arg);
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void (*cxafct) (void *arg, int status);
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case ef_free:
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case ef_us:
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break;
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case ef_on:
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onfct = f->func.on.fn;
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (onfct);
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#endif
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onfct (status, f->func.on.arg);
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break;
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case ef_at:
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atfct = f->func.at;
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (atfct);
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#endif
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atfct ();
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break;
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case ef_cxa:
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cxafct = f->func.cxa.fn;
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (cxafct);
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#endif
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cxafct (f->func.cxa.arg, status);
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break;
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}
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}
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*listp = cur->next;
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if (*listp != NULL)
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/* Don't free the last element in the chain, this is the statically
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allocate element. */
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free (cur);
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}
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if (run_list_atexit)
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RUN_HOOK (__libc_atexit, ());
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_exit (status);
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}
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void
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exit (int status)
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{
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__run_exit_handlers (status, &__exit_funcs, true);
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}
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libc_hidden_def (exit)
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