a1bdd81664
The main drive is to optimize the internal usage and required size when sigset_t is embedded in other data structures. On Linux, the current supported signal set requires up to 8 bytes (16 on mips), was lower than the user defined sigset_t (128 bytes). A new internal type internal_sigset_t is added, along with the functions to operate on it similar to the ones for sigset_t. The internal-signals.h is also refactored to remove unused functions Besides small stack usage on some functions (posix_spawn, abort) it lower the struct pthread by about 120 bytes (112 on mips). Checked on x86_64-linux-gnu. Reviewed-by: Arjun Shankar <arjun@redhat.com>
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/* Internal sigset_t definition.
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Copyright (C) 2022 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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<https://www.gnu.org/licenses/>. */
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#ifndef _INTERNAL_SIGSET_H
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#define _INTERNAL_SIGSET_H
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#include <sigsetops.h>
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typedef struct
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{
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unsigned long int __val[__NSIG_WORDS];
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} internal_sigset_t;
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static inline void
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internal_sigset_from_sigset (internal_sigset_t *iset, const sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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iset->__val[cnt] = set->__val[cnt];
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}
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static inline void
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internal_sigemptyset (internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = 0;
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}
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static inline void
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internal_sigfillset (internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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set->__val[cnt] = ~0UL;
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}
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static inline int
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internal_sigisemptyset (const internal_sigset_t *set)
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{
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int cnt = __NSIG_WORDS;
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int ret = set->__val[--cnt];
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while (ret == 0 && --cnt >= 0)
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ret = set->__val[cnt];
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return ret == 0;
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}
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static inline void
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internal_sigandset (internal_sigset_t *dest, const internal_sigset_t *left,
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const internal_sigset_t *right)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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dest->__val[cnt] = left->__val[cnt] & right->__val[cnt];
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}
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static inline void
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internal_sigorset (internal_sigset_t *dest, const internal_sigset_t *left,
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const internal_sigset_t *right)
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{
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int cnt = __NSIG_WORDS;
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while (--cnt >= 0)
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dest->__val[cnt] = left->__val[cnt] | right->__val[cnt];
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}
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static inline int
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internal_sigismember (const internal_sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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return set->__val[word] & mask ? 1 : 0;
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}
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static inline void
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internal_sigaddset (internal_sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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set->__val[word] |= mask;
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}
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static inline void
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internal_sigdelset (internal_sigset_t *set, int sig)
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{
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unsigned long int mask = __sigmask (sig);
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unsigned long int word = __sigword (sig);
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set->__val[word] &= ~mask;
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}
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#endif /* _INTERNAL_SIGSET_H */
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