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author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-12-13 15:20:32 +0000 |
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committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2020-12-16 14:27:25 +0100 |
commit | 749cd2ca7893702f762de9d9852a39973eb044a0 (patch) | |
tree | b49f025bb86f10220b87f3832cfefed404740b45 /sysdeps/pthread/sem_close.c | |
parent | a28296e778ad464d2ba6289446668c3d0dcf1236 (diff) | |
download | glibc-749cd2ca7893702f762de9d9852a39973eb044a0.tar.gz glibc-749cd2ca7893702f762de9d9852a39973eb044a0.tar.xz glibc-749cd2ca7893702f762de9d9852a39973eb044a0.zip |
htl: Get sem_open/sem_close/sem_unlink support [BZ #25524]
This just moves the existing nptl implementation to reuse as it is in htl.
Diffstat (limited to 'sysdeps/pthread/sem_close.c')
-rw-r--r-- | sysdeps/pthread/sem_close.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/pthread/sem_close.c b/sysdeps/pthread/sem_close.c new file mode 100644 index 0000000000..5eea0e1518 --- /dev/null +++ b/sysdeps/pthread/sem_close.c @@ -0,0 +1,81 @@ +/* Copyright (C) 2002-2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <search.h> +#include <sys/mman.h> +#include "semaphoreP.h" + +struct walk_closure +{ + sem_t *the_sem; + struct inuse_sem *rec; +}; + +static void +walker (const void *inodep, VISIT which, void *closure0) +{ + struct walk_closure *closure = closure0; + struct inuse_sem *nodep = *(struct inuse_sem **) inodep; + + if (nodep->sem == closure->the_sem) + closure->rec = nodep; +} + + +int +sem_close (sem_t *sem) +{ + int result = 0; + + /* Get the lock. */ + lll_lock (__sem_mappings_lock, LLL_PRIVATE); + + /* Locate the entry for the mapping the caller provided. */ + struct inuse_sem *rec; + { + struct walk_closure closure = { .the_sem = sem, .rec = NULL }; + __twalk_r (__sem_mappings, walker, &closure); + rec = closure.rec; + } + if (rec != NULL) + { + /* Check the reference counter. If it is going to be zero, free + all the resources. */ + if (--rec->refcnt == 0) + { + /* Remove the record from the tree. */ + (void) __tdelete (rec, &__sem_mappings, __sem_search); + + result = munmap (rec->sem, sizeof (sem_t)); + + free (rec); + } + } + else + { + /* This is no valid semaphore. */ + result = -1; + __set_errno (EINVAL); + } + + /* Release the lock. */ + lll_unlock (__sem_mappings_lock, LLL_PRIVATE); + + return result; +} |