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106936415d
attribute.h is partly designed for C2X forward compatibility, since C2X will add some standard attributes. Using its macros should help insulate Emacs from C2X teething problems. * src/conf_post.h: Include attribute.h. (HAS_ATTRIBUTE, HAS_FEATURE): Rename from __has_attribute and __has_feature, to avoid polluting the builtin namespace. All uses changed. (ATTRIBUTE_COLD, ATTRIBUTE_FORMAT, FALLTHROUGH, ATTRIBUTE_CONST) (ATTRIBUTE_PURE, ATTRIBUTE_UNUSED, ATTRIBUTE_MAY_ALIAS) (ATTRIBUTE_MALLOC, ATTRIBUTE_ALLOC_SIZE) (ATTRIBUTE_RETURNS_NONNULL): Remove, as attribute.h does this now. (NO_INLINE, EXTERNALLY_VISIBLE, ARG_NONNULL, ATTRIBUTE_UNUSED): Simplify by defining in terms of attribute.h macros. * src/systhread.h (ATTRIBUTE_WARN_UNUSED_RESULT): Remove. All uses replaced by attribute.h’s NODISCARD.
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/* System thread definitions
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Copyright (C) 2012-2020 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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GNU Emacs 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef SYSTHREAD_H
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#define SYSTHREAD_H
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#include <stdbool.h>
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#ifdef THREADS_ENABLED
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#ifdef HAVE_PTHREAD
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#include <pthread.h>
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/* A system mutex is just a pthread mutex. This is only used for the
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GIL. */
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typedef pthread_mutex_t sys_mutex_t;
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typedef pthread_cond_t sys_cond_t;
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/* A system thread. */
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typedef pthread_t sys_thread_t;
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#else /* HAVE_PTHREAD */
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#ifdef WINDOWSNT
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/* This header is indirectly included in every source file. We don't
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want to include windows.h in every source file, so we repeat
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declarations of the few necessary data types here (under different
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names, to avoid conflicts with files that do include
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windows.h). */
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typedef struct {
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struct _CRITICAL_SECTION_DEBUG *DebugInfo;
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long LockCount;
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long RecursionCount;
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void *OwningThread;
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void *LockSemaphore;
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unsigned long SpinCount;
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} w32thread_critsect;
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enum { CONDV_SIGNAL = 0, CONDV_BROADCAST = 1, CONDV_MAX = 2 };
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typedef struct {
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/* Count of threads that are waiting for this condition variable. */
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unsigned wait_count;
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/* Critical section to protect changes to the count above. */
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w32thread_critsect wait_count_lock;
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/* Handles of events used for signal and broadcast. */
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void *events[CONDV_MAX];
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bool initialized;
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} w32thread_cond_t;
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typedef w32thread_critsect sys_mutex_t;
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typedef w32thread_cond_t sys_cond_t;
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typedef unsigned long sys_thread_t;
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#else /* !WINDOWSNT */
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#error port me
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#endif /* WINDOWSNT */
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#endif /* HAVE_PTHREAD */
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#else /* THREADS_ENABLED */
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/* For the no-threads case we can simply use dummy definitions. */
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typedef int sys_mutex_t;
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typedef int sys_cond_t;
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typedef int sys_thread_t;
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#endif /* THREADS_ENABLED */
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typedef void *(thread_creation_function) (void *);
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extern void sys_mutex_init (sys_mutex_t *);
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extern void sys_mutex_lock (sys_mutex_t *);
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extern void sys_mutex_unlock (sys_mutex_t *);
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extern void sys_cond_init (sys_cond_t *);
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extern void sys_cond_wait (sys_cond_t *, sys_mutex_t *);
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extern void sys_cond_signal (sys_cond_t *);
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extern void sys_cond_broadcast (sys_cond_t *);
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extern void sys_cond_destroy (sys_cond_t *);
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extern sys_thread_t sys_thread_self (void)
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NODISCARD;
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extern bool sys_thread_equal (sys_thread_t, sys_thread_t)
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NODISCARD;
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extern bool sys_thread_create (sys_thread_t *, thread_creation_function *,
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void *)
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NODISCARD;
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extern void sys_thread_yield (void);
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extern void sys_thread_set_name (const char *);
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#endif /* SYSTHREAD_H */
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