New upstream version 2.3.4
This commit is contained in:
parent
e7bdd1c6c6
commit
de72f6f588
556 changed files with 90432 additions and 53391 deletions
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@ -1,22 +1,21 @@
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/* Locking in multithreaded situations.
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Copyright (C) 2005-2013 Free Software Foundation, Inc.
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Copyright (C) 2005-2023 Free Software Foundation, Inc.
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This program 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, or (at your option)
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any later version.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This file 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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GNU Lesser 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 this program; if not, see <http://www.gnu.org/licenses/>. */
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2005.
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Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-solaris.h,
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gthr-win32.h. */
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Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-win32.h. */
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/* This file contains locking primitives for use with a given thread library.
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It does not contain primitives for creating threads or for other
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@ -81,6 +80,127 @@
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#include <errno.h>
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#include <stdlib.h>
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#if !defined c11_threads_in_use
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# if HAVE_THREADS_H && USE_POSIX_THREADS_FROM_LIBC
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# define c11_threads_in_use() 1
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# elif HAVE_THREADS_H && USE_POSIX_THREADS_WEAK
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# include <threads.h>
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# pragma weak thrd_exit
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# define c11_threads_in_use() (thrd_exit != NULL)
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# else
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# define c11_threads_in_use() 0
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# endif
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#endif
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/* ========================================================================= */
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#if USE_ISOC_THREADS || USE_ISOC_AND_POSIX_THREADS
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/* Use the ISO C threads library. */
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# include <threads.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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/* -------------------------- gl_lock_t datatype -------------------------- */
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typedef struct
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{
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int volatile init_needed;
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once_flag init_once;
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void (*init_func) (void);
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mtx_t mutex;
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}
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gl_lock_t;
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# define gl_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS gl_lock_t NAME;
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# define gl_lock_define_initialized(STORAGECLASS, NAME) \
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static void _atomic_init_##NAME (void); \
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STORAGECLASS gl_lock_t NAME = \
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{ 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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static void _atomic_init_##NAME (void) \
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{ \
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if (glthread_lock_init (&(NAME))) \
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abort (); \
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}
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extern int glthread_lock_init (gl_lock_t *lock);
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extern int glthread_lock_lock (gl_lock_t *lock);
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extern int glthread_lock_unlock (gl_lock_t *lock);
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extern int glthread_lock_destroy (gl_lock_t *lock);
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/* ------------------------- gl_rwlock_t datatype ------------------------- */
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typedef struct
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{
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int volatile init_needed;
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once_flag init_once;
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void (*init_func) (void);
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mtx_t lock; /* protects the remaining fields */
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cnd_t waiting_readers; /* waiting readers */
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cnd_t waiting_writers; /* waiting writers */
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unsigned int waiting_writers_count; /* number of waiting writers */
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int runcount; /* number of readers running, or -1 when a writer runs */
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}
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gl_rwlock_t;
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# define gl_rwlock_define(STORAGECLASS, NAME) \
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STORAGECLASS gl_rwlock_t NAME;
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# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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static void _atomic_init_##NAME (void); \
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STORAGECLASS gl_rwlock_t NAME = \
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{ 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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static void _atomic_init_##NAME (void) \
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{ \
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if (glthread_rwlock_init (&(NAME))) \
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abort (); \
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}
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extern int glthread_rwlock_init (gl_rwlock_t *lock);
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extern int glthread_rwlock_rdlock (gl_rwlock_t *lock);
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extern int glthread_rwlock_wrlock (gl_rwlock_t *lock);
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extern int glthread_rwlock_unlock (gl_rwlock_t *lock);
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extern int glthread_rwlock_destroy (gl_rwlock_t *lock);
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/* --------------------- gl_recursive_lock_t datatype --------------------- */
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typedef struct
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{
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int volatile init_needed;
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once_flag init_once;
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void (*init_func) (void);
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mtx_t mutex;
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}
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gl_recursive_lock_t;
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# define gl_recursive_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS gl_recursive_lock_t NAME;
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# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
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static void _atomic_init_##NAME (void); \
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STORAGECLASS gl_recursive_lock_t NAME = \
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{ 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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static void _atomic_init_##NAME (void) \
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{ \
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if (glthread_recursive_lock_init (&(NAME))) \
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abort (); \
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}
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extern int glthread_recursive_lock_init (gl_recursive_lock_t *lock);
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extern int glthread_recursive_lock_lock (gl_recursive_lock_t *lock);
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extern int glthread_recursive_lock_unlock (gl_recursive_lock_t *lock);
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extern int glthread_recursive_lock_destroy (gl_recursive_lock_t *lock);
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/* -------------------------- gl_once_t datatype -------------------------- */
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typedef once_flag gl_once_t;
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# define gl_once_define(STORAGECLASS, NAME) \
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STORAGECLASS once_flag NAME = ONCE_FLAG_INIT;
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# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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(call_once (ONCE_CONTROL, INITFUNCTION), 0)
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# ifdef __cplusplus
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}
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# endif
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#endif
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/* ========================================================================= */
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#if USE_POSIX_THREADS
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@ -139,13 +259,25 @@ extern int glthread_in_use (void);
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# pragma weak pthread_mutexattr_init
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# pragma weak pthread_mutexattr_settype
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# pragma weak pthread_mutexattr_destroy
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# pragma weak pthread_rwlockattr_init
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# if __GNU_LIBRARY__ > 1
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# pragma weak pthread_rwlockattr_setkind_np
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# endif
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# pragma weak pthread_rwlockattr_destroy
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# ifndef pthread_self
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# pragma weak pthread_self
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# endif
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# if !PTHREAD_IN_USE_DETECTION_HARD
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# pragma weak pthread_cancel
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# define pthread_in_use() (pthread_cancel != NULL)
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/* Considering all platforms with USE_POSIX_THREADS_WEAK, only few symbols
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can be used to determine whether libpthread is in use. These are:
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pthread_mutexattr_gettype
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pthread_rwlockattr_destroy
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pthread_rwlockattr_init
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*/
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# pragma weak pthread_mutexattr_gettype
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# define pthread_in_use() \
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(pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
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# endif
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# else
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@ -176,19 +308,32 @@ typedef pthread_mutex_t gl_lock_t;
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/* ------------------------- gl_rwlock_t datatype ------------------------- */
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# if HAVE_PTHREAD_RWLOCK
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# if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (defined PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP && (__GNU_LIBRARY__ > 1)))
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# ifdef PTHREAD_RWLOCK_INITIALIZER
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# if defined PTHREAD_RWLOCK_INITIALIZER || defined PTHREAD_RWLOCK_INITIALIZER_NP
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typedef pthread_rwlock_t gl_rwlock_t;
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# define gl_rwlock_define(STORAGECLASS, NAME) \
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STORAGECLASS pthread_rwlock_t NAME;
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# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS pthread_rwlock_t NAME = gl_rwlock_initializer;
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# define gl_rwlock_initializer \
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PTHREAD_RWLOCK_INITIALIZER
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# define glthread_rwlock_init(LOCK) \
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(pthread_in_use () ? pthread_rwlock_init (LOCK, NULL) : 0)
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# if HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
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# if defined PTHREAD_RWLOCK_INITIALIZER
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# define gl_rwlock_initializer \
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PTHREAD_RWLOCK_INITIALIZER
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# else
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# define gl_rwlock_initializer \
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PTHREAD_RWLOCK_INITIALIZER_NP
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# endif
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# define glthread_rwlock_init(LOCK) \
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(pthread_in_use () ? pthread_rwlock_init (LOCK, NULL) : 0)
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# else /* glibc with bug https://sourceware.org/bugzilla/show_bug.cgi?id=13701 */
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# define gl_rwlock_initializer \
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PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
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# define glthread_rwlock_init(LOCK) \
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(pthread_in_use () ? glthread_rwlock_init_for_glibc (LOCK) : 0)
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extern int glthread_rwlock_init_for_glibc (pthread_rwlock_t *lock);
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# endif
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# define glthread_rwlock_rdlock(LOCK) \
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(pthread_in_use () ? pthread_rwlock_rdlock (LOCK) : 0)
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# define glthread_rwlock_wrlock(LOCK) \
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@ -362,10 +507,19 @@ extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *l
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typedef pthread_once_t gl_once_t;
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# define gl_once_define(STORAGECLASS, NAME) \
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STORAGECLASS pthread_once_t NAME = PTHREAD_ONCE_INIT;
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# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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(pthread_in_use () \
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? pthread_once (ONCE_CONTROL, INITFUNCTION) \
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: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
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# if PTHREAD_IN_USE_DETECTION_HARD || USE_POSIX_THREADS_WEAK
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# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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(pthread_in_use () \
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? pthread_once (ONCE_CONTROL, INITFUNCTION) \
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: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
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# else
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# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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(pthread_in_use () \
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? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
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: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
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extern int glthread_once_multithreaded (pthread_once_t *once_control,
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void (*init_function) (void));
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# endif
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extern int glthread_once_singlethreaded (pthread_once_t *once_control);
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# ifdef __cplusplus
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@ -376,248 +530,16 @@ extern int glthread_once_singlethreaded (pthread_once_t *once_control);
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/* ========================================================================= */
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#if USE_PTH_THREADS
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/* Use the GNU Pth threads library. */
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# include <pth.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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# if USE_PTH_THREADS_WEAK
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/* Use weak references to the GNU Pth threads library. */
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# pragma weak pth_mutex_init
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# pragma weak pth_mutex_acquire
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# pragma weak pth_mutex_release
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# pragma weak pth_rwlock_init
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# pragma weak pth_rwlock_acquire
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# pragma weak pth_rwlock_release
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# pragma weak pth_once
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# pragma weak pth_cancel
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# define pth_in_use() (pth_cancel != NULL)
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# else
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# define pth_in_use() 1
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# endif
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/* -------------------------- gl_lock_t datatype -------------------------- */
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typedef pth_mutex_t gl_lock_t;
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# define gl_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS pth_mutex_t NAME;
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# define gl_lock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS pth_mutex_t NAME = gl_lock_initializer;
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# define gl_lock_initializer \
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PTH_MUTEX_INIT
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# define glthread_lock_init(LOCK) \
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(pth_in_use () && !pth_mutex_init (LOCK) ? errno : 0)
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# define glthread_lock_lock(LOCK) \
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(pth_in_use () && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
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# define glthread_lock_unlock(LOCK) \
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(pth_in_use () && !pth_mutex_release (LOCK) ? errno : 0)
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# define glthread_lock_destroy(LOCK) \
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((void)(LOCK), 0)
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/* ------------------------- gl_rwlock_t datatype ------------------------- */
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typedef pth_rwlock_t gl_rwlock_t;
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# define gl_rwlock_define(STORAGECLASS, NAME) \
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STORAGECLASS pth_rwlock_t NAME;
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# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS pth_rwlock_t NAME = gl_rwlock_initializer;
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# define gl_rwlock_initializer \
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PTH_RWLOCK_INIT
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# define glthread_rwlock_init(LOCK) \
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(pth_in_use () && !pth_rwlock_init (LOCK) ? errno : 0)
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# define glthread_rwlock_rdlock(LOCK) \
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(pth_in_use () && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RD, 0, NULL) ? errno : 0)
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# define glthread_rwlock_wrlock(LOCK) \
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(pth_in_use () && !pth_rwlock_acquire (LOCK, PTH_RWLOCK_RW, 0, NULL) ? errno : 0)
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# define glthread_rwlock_unlock(LOCK) \
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(pth_in_use () && !pth_rwlock_release (LOCK) ? errno : 0)
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# define glthread_rwlock_destroy(LOCK) \
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((void)(LOCK), 0)
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/* --------------------- gl_recursive_lock_t datatype --------------------- */
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/* In Pth, mutexes are recursive by default. */
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typedef pth_mutex_t gl_recursive_lock_t;
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# define gl_recursive_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS pth_mutex_t NAME;
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# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS pth_mutex_t NAME = gl_recursive_lock_initializer;
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# define gl_recursive_lock_initializer \
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PTH_MUTEX_INIT
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# define glthread_recursive_lock_init(LOCK) \
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(pth_in_use () && !pth_mutex_init (LOCK) ? errno : 0)
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# define glthread_recursive_lock_lock(LOCK) \
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(pth_in_use () && !pth_mutex_acquire (LOCK, 0, NULL) ? errno : 0)
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# define glthread_recursive_lock_unlock(LOCK) \
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(pth_in_use () && !pth_mutex_release (LOCK) ? errno : 0)
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# define glthread_recursive_lock_destroy(LOCK) \
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((void)(LOCK), 0)
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/* -------------------------- gl_once_t datatype -------------------------- */
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typedef pth_once_t gl_once_t;
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# define gl_once_define(STORAGECLASS, NAME) \
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STORAGECLASS pth_once_t NAME = PTH_ONCE_INIT;
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# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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(pth_in_use () \
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? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
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: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
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extern int glthread_once_multithreaded (pth_once_t *once_control, void (*initfunction) (void));
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extern int glthread_once_singlethreaded (pth_once_t *once_control);
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# ifdef __cplusplus
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}
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# endif
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#endif
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/* ========================================================================= */
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#if USE_SOLARIS_THREADS
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/* Use the old Solaris threads library. */
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# include <thread.h>
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# include <synch.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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# if USE_SOLARIS_THREADS_WEAK
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/* Use weak references to the old Solaris threads library. */
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# pragma weak mutex_init
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# pragma weak mutex_lock
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# pragma weak mutex_unlock
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# pragma weak mutex_destroy
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# pragma weak rwlock_init
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# pragma weak rw_rdlock
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# pragma weak rw_wrlock
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# pragma weak rw_unlock
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# pragma weak rwlock_destroy
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# pragma weak thr_self
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# pragma weak thr_suspend
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# define thread_in_use() (thr_suspend != NULL)
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# else
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# define thread_in_use() 1
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# endif
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/* -------------------------- gl_lock_t datatype -------------------------- */
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typedef mutex_t gl_lock_t;
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# define gl_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS mutex_t NAME;
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# define gl_lock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS mutex_t NAME = gl_lock_initializer;
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# define gl_lock_initializer \
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DEFAULTMUTEX
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# define glthread_lock_init(LOCK) \
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(thread_in_use () ? mutex_init (LOCK, USYNC_THREAD, NULL) : 0)
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# define glthread_lock_lock(LOCK) \
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(thread_in_use () ? mutex_lock (LOCK) : 0)
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# define glthread_lock_unlock(LOCK) \
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(thread_in_use () ? mutex_unlock (LOCK) : 0)
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# define glthread_lock_destroy(LOCK) \
|
||||
(thread_in_use () ? mutex_destroy (LOCK) : 0)
|
||||
|
||||
/* ------------------------- gl_rwlock_t datatype ------------------------- */
|
||||
|
||||
typedef rwlock_t gl_rwlock_t;
|
||||
# define gl_rwlock_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS rwlock_t NAME;
|
||||
# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
|
||||
STORAGECLASS rwlock_t NAME = gl_rwlock_initializer;
|
||||
# define gl_rwlock_initializer \
|
||||
DEFAULTRWLOCK
|
||||
# define glthread_rwlock_init(LOCK) \
|
||||
(thread_in_use () ? rwlock_init (LOCK, USYNC_THREAD, NULL) : 0)
|
||||
# define glthread_rwlock_rdlock(LOCK) \
|
||||
(thread_in_use () ? rw_rdlock (LOCK) : 0)
|
||||
# define glthread_rwlock_wrlock(LOCK) \
|
||||
(thread_in_use () ? rw_wrlock (LOCK) : 0)
|
||||
# define glthread_rwlock_unlock(LOCK) \
|
||||
(thread_in_use () ? rw_unlock (LOCK) : 0)
|
||||
# define glthread_rwlock_destroy(LOCK) \
|
||||
(thread_in_use () ? rwlock_destroy (LOCK) : 0)
|
||||
|
||||
/* --------------------- gl_recursive_lock_t datatype --------------------- */
|
||||
|
||||
/* Old Solaris threads did not have recursive locks.
|
||||
We have to implement them ourselves. */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
mutex_t mutex;
|
||||
thread_t owner;
|
||||
unsigned long depth;
|
||||
}
|
||||
gl_recursive_lock_t;
|
||||
# define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_recursive_lock_t NAME;
|
||||
# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
|
||||
# define gl_recursive_lock_initializer \
|
||||
{ DEFAULTMUTEX, (thread_t) 0, 0 }
|
||||
# define glthread_recursive_lock_init(LOCK) \
|
||||
(thread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
||||
# define glthread_recursive_lock_lock(LOCK) \
|
||||
(thread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
|
||||
# define glthread_recursive_lock_unlock(LOCK) \
|
||||
(thread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
|
||||
# define glthread_recursive_lock_destroy(LOCK) \
|
||||
(thread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
|
||||
extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
|
||||
|
||||
/* -------------------------- gl_once_t datatype -------------------------- */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
volatile int inited;
|
||||
mutex_t mutex;
|
||||
}
|
||||
gl_once_t;
|
||||
# define gl_once_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_once_t NAME = { 0, DEFAULTMUTEX };
|
||||
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||||
(thread_in_use () \
|
||||
? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
|
||||
: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
|
||||
extern int glthread_once_multithreaded (gl_once_t *once_control, void (*initfunction) (void));
|
||||
extern int glthread_once_singlethreaded (gl_once_t *once_control);
|
||||
|
||||
# ifdef __cplusplus
|
||||
}
|
||||
# endif
|
||||
|
||||
#endif
|
||||
|
||||
/* ========================================================================= */
|
||||
|
||||
#if USE_WINDOWS_THREADS
|
||||
|
||||
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
|
||||
# include <windows.h>
|
||||
|
||||
# include "windows-mutex.h"
|
||||
# include "windows-rwlock.h"
|
||||
# include "windows-recmutex.h"
|
||||
# include "windows-once.h"
|
||||
|
||||
# ifdef __cplusplus
|
||||
extern "C" {
|
||||
# endif
|
||||
|
|
@ -633,127 +555,69 @@ extern "C" {
|
|||
/* There is no way to statically initialize a CRITICAL_SECTION. It needs
|
||||
to be done lazily, once only. For this we need spinlocks. */
|
||||
|
||||
typedef struct { volatile int done; volatile long started; } gl_spinlock_t;
|
||||
|
||||
/* -------------------------- gl_lock_t datatype -------------------------- */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
gl_spinlock_t guard; /* protects the initialization */
|
||||
CRITICAL_SECTION lock;
|
||||
}
|
||||
gl_lock_t;
|
||||
typedef glwthread_mutex_t gl_lock_t;
|
||||
# define gl_lock_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_lock_t NAME;
|
||||
# define gl_lock_define_initialized(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_lock_t NAME = gl_lock_initializer;
|
||||
# define gl_lock_initializer \
|
||||
{ { 0, -1 } }
|
||||
GLWTHREAD_MUTEX_INIT
|
||||
# define glthread_lock_init(LOCK) \
|
||||
(glthread_lock_init_func (LOCK), 0)
|
||||
(glwthread_mutex_init (LOCK), 0)
|
||||
# define glthread_lock_lock(LOCK) \
|
||||
glthread_lock_lock_func (LOCK)
|
||||
glwthread_mutex_lock (LOCK)
|
||||
# define glthread_lock_unlock(LOCK) \
|
||||
glthread_lock_unlock_func (LOCK)
|
||||
glwthread_mutex_unlock (LOCK)
|
||||
# define glthread_lock_destroy(LOCK) \
|
||||
glthread_lock_destroy_func (LOCK)
|
||||
extern void glthread_lock_init_func (gl_lock_t *lock);
|
||||
extern int glthread_lock_lock_func (gl_lock_t *lock);
|
||||
extern int glthread_lock_unlock_func (gl_lock_t *lock);
|
||||
extern int glthread_lock_destroy_func (gl_lock_t *lock);
|
||||
glwthread_mutex_destroy (LOCK)
|
||||
|
||||
/* ------------------------- gl_rwlock_t datatype ------------------------- */
|
||||
|
||||
/* It is impossible to implement read-write locks using plain locks, without
|
||||
introducing an extra thread dedicated to managing read-write locks.
|
||||
Therefore here we need to use the low-level Event type. */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
HANDLE *array; /* array of waiting threads, each represented by an event */
|
||||
unsigned int count; /* number of waiting threads */
|
||||
unsigned int alloc; /* length of allocated array */
|
||||
unsigned int offset; /* index of first waiting thread in array */
|
||||
}
|
||||
gl_carray_waitqueue_t;
|
||||
typedef struct
|
||||
{
|
||||
gl_spinlock_t guard; /* protects the initialization */
|
||||
CRITICAL_SECTION lock; /* protects the remaining fields */
|
||||
gl_carray_waitqueue_t waiting_readers; /* waiting readers */
|
||||
gl_carray_waitqueue_t waiting_writers; /* waiting writers */
|
||||
int runcount; /* number of readers running, or -1 when a writer runs */
|
||||
}
|
||||
gl_rwlock_t;
|
||||
typedef glwthread_rwlock_t gl_rwlock_t;
|
||||
# define gl_rwlock_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_rwlock_t NAME;
|
||||
# define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
|
||||
# define gl_rwlock_initializer \
|
||||
{ { 0, -1 } }
|
||||
GLWTHREAD_RWLOCK_INIT
|
||||
# define glthread_rwlock_init(LOCK) \
|
||||
(glthread_rwlock_init_func (LOCK), 0)
|
||||
(glwthread_rwlock_init (LOCK), 0)
|
||||
# define glthread_rwlock_rdlock(LOCK) \
|
||||
glthread_rwlock_rdlock_func (LOCK)
|
||||
glwthread_rwlock_rdlock (LOCK)
|
||||
# define glthread_rwlock_wrlock(LOCK) \
|
||||
glthread_rwlock_wrlock_func (LOCK)
|
||||
glwthread_rwlock_wrlock (LOCK)
|
||||
# define glthread_rwlock_unlock(LOCK) \
|
||||
glthread_rwlock_unlock_func (LOCK)
|
||||
glwthread_rwlock_unlock (LOCK)
|
||||
# define glthread_rwlock_destroy(LOCK) \
|
||||
glthread_rwlock_destroy_func (LOCK)
|
||||
extern void glthread_rwlock_init_func (gl_rwlock_t *lock);
|
||||
extern int glthread_rwlock_rdlock_func (gl_rwlock_t *lock);
|
||||
extern int glthread_rwlock_wrlock_func (gl_rwlock_t *lock);
|
||||
extern int glthread_rwlock_unlock_func (gl_rwlock_t *lock);
|
||||
extern int glthread_rwlock_destroy_func (gl_rwlock_t *lock);
|
||||
glwthread_rwlock_destroy (LOCK)
|
||||
|
||||
/* --------------------- gl_recursive_lock_t datatype --------------------- */
|
||||
|
||||
/* The native Windows documentation says that CRITICAL_SECTION already
|
||||
implements a recursive lock. But we need not rely on it: It's easy to
|
||||
implement a recursive lock without this assumption. */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
gl_spinlock_t guard; /* protects the initialization */
|
||||
DWORD owner;
|
||||
unsigned long depth;
|
||||
CRITICAL_SECTION lock;
|
||||
}
|
||||
gl_recursive_lock_t;
|
||||
typedef glwthread_recmutex_t gl_recursive_lock_t;
|
||||
# define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_recursive_lock_t NAME;
|
||||
# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
|
||||
# define gl_recursive_lock_initializer \
|
||||
{ { 0, -1 }, 0, 0 }
|
||||
GLWTHREAD_RECMUTEX_INIT
|
||||
# define glthread_recursive_lock_init(LOCK) \
|
||||
(glthread_recursive_lock_init_func (LOCK), 0)
|
||||
(glwthread_recmutex_init (LOCK), 0)
|
||||
# define glthread_recursive_lock_lock(LOCK) \
|
||||
glthread_recursive_lock_lock_func (LOCK)
|
||||
glwthread_recmutex_lock (LOCK)
|
||||
# define glthread_recursive_lock_unlock(LOCK) \
|
||||
glthread_recursive_lock_unlock_func (LOCK)
|
||||
glwthread_recmutex_unlock (LOCK)
|
||||
# define glthread_recursive_lock_destroy(LOCK) \
|
||||
glthread_recursive_lock_destroy_func (LOCK)
|
||||
extern void glthread_recursive_lock_init_func (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_lock_func (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_unlock_func (gl_recursive_lock_t *lock);
|
||||
extern int glthread_recursive_lock_destroy_func (gl_recursive_lock_t *lock);
|
||||
glwthread_recmutex_destroy (LOCK)
|
||||
|
||||
/* -------------------------- gl_once_t datatype -------------------------- */
|
||||
|
||||
typedef struct
|
||||
{
|
||||
volatile int inited;
|
||||
volatile long started;
|
||||
CRITICAL_SECTION lock;
|
||||
}
|
||||
gl_once_t;
|
||||
typedef glwthread_once_t gl_once_t;
|
||||
# define gl_once_define(STORAGECLASS, NAME) \
|
||||
STORAGECLASS gl_once_t NAME = { -1, -1 };
|
||||
STORAGECLASS gl_once_t NAME = GLWTHREAD_ONCE_INIT;
|
||||
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||||
(glthread_once_func (ONCE_CONTROL, INITFUNCTION), 0)
|
||||
extern void glthread_once_func (gl_once_t *once_control, void (*initfunction) (void));
|
||||
(glwthread_once (ONCE_CONTROL, INITFUNCTION), 0)
|
||||
|
||||
# ifdef __cplusplus
|
||||
}
|
||||
|
|
@ -763,7 +627,7 @@ extern void glthread_once_func (gl_once_t *once_control, void (*initfunction) (v
|
|||
|
||||
/* ========================================================================= */
|
||||
|
||||
#if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WINDOWS_THREADS)
|
||||
#if !(USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS)
|
||||
|
||||
/* Provide dummy implementation if threads are not supported. */
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue