112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/* Deallocation thread-specific data structures related to pthread_key_create.
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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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<https://www.gnu.org/licenses/>. */
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#include <pthreadP.h>
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/* Deallocate POSIX thread-local-storage. */
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void
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__nptl_deallocate_tsd (void)
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{
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struct pthread *self = THREAD_SELF;
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/* Maybe no data was ever allocated. This happens often so we have
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a flag for this. */
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if (THREAD_GETMEM (self, specific_used))
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{
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size_t round;
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size_t cnt;
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round = 0;
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do
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{
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size_t idx;
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/* So far no new nonzero data entry. */
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THREAD_SETMEM (self, specific_used, false);
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for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
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{
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struct pthread_key_data *level2;
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level2 = THREAD_GETMEM_NC (self, specific, cnt);
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if (level2 != NULL)
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{
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size_t inner;
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for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE;
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++inner, ++idx)
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{
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void *data = level2[inner].data;
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if (data != NULL)
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{
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/* Always clear the data. */
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level2[inner].data = NULL;
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/* Make sure the data corresponds to a valid
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key. This test fails if the key was
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deallocated and also if it was
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re-allocated. It is the user's
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responsibility to free the memory in this
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case. */
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if (level2[inner].seq
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== __pthread_keys[idx].seq
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/* It is not necessary to register a destructor
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function. */
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&& __pthread_keys[idx].destr != NULL)
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/* Call the user-provided destructor. */
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__pthread_keys[idx].destr (data);
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}
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}
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}
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else
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idx += PTHREAD_KEY_1STLEVEL_SIZE;
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}
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if (THREAD_GETMEM (self, specific_used) == 0)
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/* No data has been modified. */
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goto just_free;
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}
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/* We only repeat the process a fixed number of times. */
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while (__builtin_expect (++round < PTHREAD_DESTRUCTOR_ITERATIONS, 0));
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/* Just clear the memory of the first block for reuse. */
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memset (&THREAD_SELF->specific_1stblock, '\0',
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sizeof (self->specific_1stblock));
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just_free:
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/* Free the memory for the other blocks. */
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for (cnt = 1; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt)
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{
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struct pthread_key_data *level2;
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level2 = THREAD_GETMEM_NC (self, specific, cnt);
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if (level2 != NULL)
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{
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/* The first block is allocated as part of the thread
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descriptor. */
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free (level2);
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THREAD_SETMEM_NC (self, specific, cnt, NULL);
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}
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}
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THREAD_SETMEM (self, specific_used, false);
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}
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}
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libc_hidden_def (__nptl_deallocate_tsd)
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