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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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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