790 lines
31 KiB
C
790 lines
31 KiB
C
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/* Locking in multithreaded situations.
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Copyright (C) 2005-2021 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 program 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 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-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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synchronization primitives.
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Normal (non-recursive) locks:
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Type: gl_lock_t
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Declaration: gl_lock_define(extern, name)
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Initializer: gl_lock_define_initialized(, name)
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Initialization: gl_lock_init (name);
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Taking the lock: gl_lock_lock (name);
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Releasing the lock: gl_lock_unlock (name);
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De-initialization: gl_lock_destroy (name);
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Equivalent functions with control of error handling:
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Initialization: err = glthread_lock_init (&name);
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Taking the lock: err = glthread_lock_lock (&name);
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Releasing the lock: err = glthread_lock_unlock (&name);
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De-initialization: err = glthread_lock_destroy (&name);
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Read-Write (non-recursive) locks:
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Type: gl_rwlock_t
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Declaration: gl_rwlock_define(extern, name)
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Initializer: gl_rwlock_define_initialized(, name)
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Initialization: gl_rwlock_init (name);
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Taking the lock: gl_rwlock_rdlock (name);
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gl_rwlock_wrlock (name);
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Releasing the lock: gl_rwlock_unlock (name);
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De-initialization: gl_rwlock_destroy (name);
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Equivalent functions with control of error handling:
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Initialization: err = glthread_rwlock_init (&name);
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Taking the lock: err = glthread_rwlock_rdlock (&name);
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err = glthread_rwlock_wrlock (&name);
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Releasing the lock: err = glthread_rwlock_unlock (&name);
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De-initialization: err = glthread_rwlock_destroy (&name);
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Recursive locks:
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Type: gl_recursive_lock_t
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Declaration: gl_recursive_lock_define(extern, name)
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Initializer: gl_recursive_lock_define_initialized(, name)
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Initialization: gl_recursive_lock_init (name);
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Taking the lock: gl_recursive_lock_lock (name);
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Releasing the lock: gl_recursive_lock_unlock (name);
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De-initialization: gl_recursive_lock_destroy (name);
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Equivalent functions with control of error handling:
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Initialization: err = glthread_recursive_lock_init (&name);
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Taking the lock: err = glthread_recursive_lock_lock (&name);
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Releasing the lock: err = glthread_recursive_lock_unlock (&name);
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De-initialization: err = glthread_recursive_lock_destroy (&name);
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Once-only execution:
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Type: gl_once_t
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Initializer: gl_once_define(extern, name)
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Execution: gl_once (name, initfunction);
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Equivalent functions with control of error handling:
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Execution: err = glthread_once (&name, initfunction);
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*/
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#ifndef _LOCK_H
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#define _LOCK_H
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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_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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/* Use the POSIX threads library. */
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# include <pthread.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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# if PTHREAD_IN_USE_DETECTION_HARD
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/* The pthread_in_use() detection needs to be done at runtime. */
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# define pthread_in_use() \
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glthread_in_use ()
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extern int glthread_in_use (void);
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# endif
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# if USE_POSIX_THREADS_WEAK
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/* Use weak references to the POSIX threads library. */
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/* Weak references avoid dragging in external libraries if the other parts
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of the program don't use them. Here we use them, because we don't want
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every program that uses libintl to depend on libpthread. This assumes
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that libpthread would not be loaded after libintl; i.e. if libintl is
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loaded first, by an executable that does not depend on libpthread, and
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then a module is dynamically loaded that depends on libpthread, libintl
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will not be multithread-safe. */
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/* The way to test at runtime whether libpthread is present is to test
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whether a function pointer's value, such as &pthread_mutex_init, is
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non-NULL. However, some versions of GCC have a bug through which, in
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PIC mode, &foo != NULL always evaluates to true if there is a direct
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call to foo(...) in the same function. To avoid this, we test the
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address of a function in libpthread that we don't use. */
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# pragma weak pthread_mutex_init
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# pragma weak pthread_mutex_lock
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# pragma weak pthread_mutex_unlock
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# pragma weak pthread_mutex_destroy
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# pragma weak pthread_rwlock_init
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# pragma weak pthread_rwlock_rdlock
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# pragma weak pthread_rwlock_wrlock
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# pragma weak pthread_rwlock_unlock
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# pragma weak pthread_rwlock_destroy
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# pragma weak pthread_once
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# pragma weak pthread_cond_init
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# pragma weak pthread_cond_wait
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# pragma weak pthread_cond_signal
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# pragma weak pthread_cond_broadcast
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# pragma weak pthread_cond_destroy
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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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/* 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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# if !PTHREAD_IN_USE_DETECTION_HARD
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# define pthread_in_use() 1
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# endif
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# endif
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/* -------------------------- gl_lock_t datatype -------------------------- */
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typedef pthread_mutex_t gl_lock_t;
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# define gl_lock_define(STORAGECLASS, NAME) \
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STORAGECLASS pthread_mutex_t NAME;
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# define gl_lock_define_initialized(STORAGECLASS, NAME) \
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STORAGECLASS pthread_mutex_t NAME = gl_lock_initializer;
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# define gl_lock_initializer \
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PTHREAD_MUTEX_INITIALIZER
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# define glthread_lock_init(LOCK) \
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(pthread_in_use () ? pthread_mutex_init (LOCK, NULL) : 0)
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# define glthread_lock_lock(LOCK) \
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(pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
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# define glthread_lock_unlock(LOCK) \
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(pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
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# define glthread_lock_destroy(LOCK) \
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(pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
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/* ------------------------- gl_rwlock_t datatype ------------------------- */
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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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# 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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# 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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(pthread_in_use () ? pthread_rwlock_wrlock (LOCK) : 0)
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# define glthread_rwlock_unlock(LOCK) \
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(pthread_in_use () ? pthread_rwlock_unlock (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_destroy(LOCK) \
|
||
|
|
(pthread_in_use () ? pthread_rwlock_destroy (LOCK) : 0)
|
||
|
|
|
||
|
|
# else
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
int initialized;
|
||
|
|
pthread_mutex_t guard; /* protects the initialization */
|
||
|
|
pthread_rwlock_t rwlock; /* read-write lock */
|
||
|
|
}
|
||
|
|
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, PTHREAD_MUTEX_INITIALIZER }
|
||
|
|
# define glthread_rwlock_init(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_rdlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_wrlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_unlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_destroy(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
|
||
|
|
extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
|
||
|
|
|
||
|
|
# endif
|
||
|
|
|
||
|
|
# else
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
pthread_mutex_t lock; /* protects the remaining fields */
|
||
|
|
pthread_cond_t waiting_readers; /* waiting readers */
|
||
|
|
pthread_cond_t waiting_writers; /* waiting writers */
|
||
|
|
unsigned int waiting_writers_count; /* number of waiting writers */
|
||
|
|
int runcount; /* number of readers running, or -1 when a writer runs */
|
||
|
|
}
|
||
|
|
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 \
|
||
|
|
{ PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0 }
|
||
|
|
# define glthread_rwlock_init(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_rdlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_wrlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_unlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_rwlock_destroy(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
|
||
|
|
extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
|
||
|
|
extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
|
||
|
|
|
||
|
|
# endif
|
||
|
|
|
||
|
|
/* --------------------- gl_recursive_lock_t datatype --------------------- */
|
||
|
|
|
||
|
|
# if HAVE_PTHREAD_MUTEX_RECURSIVE
|
||
|
|
|
||
|
|
# if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
|
||
|
|
|
||
|
|
typedef pthread_mutex_t gl_recursive_lock_t;
|
||
|
|
# define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
||
|
|
STORAGECLASS pthread_mutex_t NAME;
|
||
|
|
# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
||
|
|
STORAGECLASS pthread_mutex_t NAME = gl_recursive_lock_initializer;
|
||
|
|
# ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER
|
||
|
|
# define gl_recursive_lock_initializer \
|
||
|
|
PTHREAD_RECURSIVE_MUTEX_INITIALIZER
|
||
|
|
# else
|
||
|
|
# define gl_recursive_lock_initializer \
|
||
|
|
PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
|
||
|
|
# endif
|
||
|
|
# define glthread_recursive_lock_init(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_lock(LOCK) \
|
||
|
|
(pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_unlock(LOCK) \
|
||
|
|
(pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_destroy(LOCK) \
|
||
|
|
(pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
|
||
|
|
extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
|
||
|
|
|
||
|
|
# else
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
pthread_mutex_t recmutex; /* recursive mutex */
|
||
|
|
pthread_mutex_t guard; /* protects the initialization */
|
||
|
|
int initialized;
|
||
|
|
}
|
||
|
|
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 \
|
||
|
|
{ PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, 0 }
|
||
|
|
# define glthread_recursive_lock_init(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_lock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_unlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_destroy(LOCK) \
|
||
|
|
(pthread_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);
|
||
|
|
|
||
|
|
# endif
|
||
|
|
|
||
|
|
# else
|
||
|
|
|
||
|
|
/* Old versions of POSIX threads on Solaris did not have recursive locks.
|
||
|
|
We have to implement them ourselves. */
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
pthread_mutex_t mutex;
|
||
|
|
pthread_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 \
|
||
|
|
{ PTHREAD_MUTEX_INITIALIZER, (pthread_t) 0, 0 }
|
||
|
|
# define glthread_recursive_lock_init(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_lock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_unlock(LOCK) \
|
||
|
|
(pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
|
||
|
|
# define glthread_recursive_lock_destroy(LOCK) \
|
||
|
|
(pthread_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);
|
||
|
|
|
||
|
|
# endif
|
||
|
|
|
||
|
|
/* -------------------------- gl_once_t datatype -------------------------- */
|
||
|
|
|
||
|
|
typedef pthread_once_t gl_once_t;
|
||
|
|
# define gl_once_define(STORAGECLASS, NAME) \
|
||
|
|
STORAGECLASS pthread_once_t NAME = PTHREAD_ONCE_INIT;
|
||
|
|
# if PTHREAD_IN_USE_DETECTION_HARD || USE_POSIX_THREADS_WEAK
|
||
|
|
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
(pthread_in_use () \
|
||
|
|
? pthread_once (ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
|
||
|
|
# else
|
||
|
|
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
(pthread_in_use () \
|
||
|
|
? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
: (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
|
||
|
|
extern int glthread_once_multithreaded (pthread_once_t *once_control,
|
||
|
|
void (*init_function) (void));
|
||
|
|
# endif
|
||
|
|
extern int glthread_once_singlethreaded (pthread_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
|
||
|
|
|
||
|
|
/* We can use CRITICAL_SECTION directly, rather than the native Windows Event,
|
||
|
|
Mutex, Semaphore types, because
|
||
|
|
- we need only to synchronize inside a single process (address space),
|
||
|
|
not inter-process locking,
|
||
|
|
- we don't need to support trylock operations. (TryEnterCriticalSection
|
||
|
|
does not work on Windows 95/98/ME. Packages that need trylock usually
|
||
|
|
define their own mutex type.) */
|
||
|
|
|
||
|
|
/* There is no way to statically initialize a CRITICAL_SECTION. It needs
|
||
|
|
to be done lazily, once only. For this we need spinlocks. */
|
||
|
|
|
||
|
|
/* -------------------------- gl_lock_t datatype -------------------------- */
|
||
|
|
|
||
|
|
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 \
|
||
|
|
GLWTHREAD_MUTEX_INIT
|
||
|
|
# define glthread_lock_init(LOCK) \
|
||
|
|
(glwthread_mutex_init (LOCK), 0)
|
||
|
|
# define glthread_lock_lock(LOCK) \
|
||
|
|
glwthread_mutex_lock (LOCK)
|
||
|
|
# define glthread_lock_unlock(LOCK) \
|
||
|
|
glwthread_mutex_unlock (LOCK)
|
||
|
|
# define glthread_lock_destroy(LOCK) \
|
||
|
|
glwthread_mutex_destroy (LOCK)
|
||
|
|
|
||
|
|
/* ------------------------- gl_rwlock_t datatype ------------------------- */
|
||
|
|
|
||
|
|
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 \
|
||
|
|
GLWTHREAD_RWLOCK_INIT
|
||
|
|
# define glthread_rwlock_init(LOCK) \
|
||
|
|
(glwthread_rwlock_init (LOCK), 0)
|
||
|
|
# define glthread_rwlock_rdlock(LOCK) \
|
||
|
|
glwthread_rwlock_rdlock (LOCK)
|
||
|
|
# define glthread_rwlock_wrlock(LOCK) \
|
||
|
|
glwthread_rwlock_wrlock (LOCK)
|
||
|
|
# define glthread_rwlock_unlock(LOCK) \
|
||
|
|
glwthread_rwlock_unlock (LOCK)
|
||
|
|
# define glthread_rwlock_destroy(LOCK) \
|
||
|
|
glwthread_rwlock_destroy (LOCK)
|
||
|
|
|
||
|
|
/* --------------------- gl_recursive_lock_t datatype --------------------- */
|
||
|
|
|
||
|
|
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 \
|
||
|
|
GLWTHREAD_RECMUTEX_INIT
|
||
|
|
# define glthread_recursive_lock_init(LOCK) \
|
||
|
|
(glwthread_recmutex_init (LOCK), 0)
|
||
|
|
# define glthread_recursive_lock_lock(LOCK) \
|
||
|
|
glwthread_recmutex_lock (LOCK)
|
||
|
|
# define glthread_recursive_lock_unlock(LOCK) \
|
||
|
|
glwthread_recmutex_unlock (LOCK)
|
||
|
|
# define glthread_recursive_lock_destroy(LOCK) \
|
||
|
|
glwthread_recmutex_destroy (LOCK)
|
||
|
|
|
||
|
|
/* -------------------------- gl_once_t datatype -------------------------- */
|
||
|
|
|
||
|
|
typedef glwthread_once_t gl_once_t;
|
||
|
|
# define gl_once_define(STORAGECLASS, NAME) \
|
||
|
|
STORAGECLASS gl_once_t NAME = GLWTHREAD_ONCE_INIT;
|
||
|
|
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
(glwthread_once (ONCE_CONTROL, INITFUNCTION), 0)
|
||
|
|
|
||
|
|
# ifdef __cplusplus
|
||
|
|
}
|
||
|
|
# endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ========================================================================= */
|
||
|
|
|
||
|
|
#if !(USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS)
|
||
|
|
|
||
|
|
/* Provide dummy implementation if threads are not supported. */
|
||
|
|
|
||
|
|
/* -------------------------- gl_lock_t datatype -------------------------- */
|
||
|
|
|
||
|
|
typedef int gl_lock_t;
|
||
|
|
# define gl_lock_define(STORAGECLASS, NAME)
|
||
|
|
# define gl_lock_define_initialized(STORAGECLASS, NAME)
|
||
|
|
# define glthread_lock_init(NAME) 0
|
||
|
|
# define glthread_lock_lock(NAME) 0
|
||
|
|
# define glthread_lock_unlock(NAME) 0
|
||
|
|
# define glthread_lock_destroy(NAME) 0
|
||
|
|
|
||
|
|
/* ------------------------- gl_rwlock_t datatype ------------------------- */
|
||
|
|
|
||
|
|
typedef int gl_rwlock_t;
|
||
|
|
# define gl_rwlock_define(STORAGECLASS, NAME)
|
||
|
|
# define gl_rwlock_define_initialized(STORAGECLASS, NAME)
|
||
|
|
# define glthread_rwlock_init(NAME) 0
|
||
|
|
# define glthread_rwlock_rdlock(NAME) 0
|
||
|
|
# define glthread_rwlock_wrlock(NAME) 0
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||
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# define glthread_rwlock_unlock(NAME) 0
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||
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# define glthread_rwlock_destroy(NAME) 0
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||
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||
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/* --------------------- gl_recursive_lock_t datatype --------------------- */
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||
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|
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||
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typedef int gl_recursive_lock_t;
|
||
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|
# define gl_recursive_lock_define(STORAGECLASS, NAME)
|
||
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|
# define gl_recursive_lock_define_initialized(STORAGECLASS, NAME)
|
||
|
|
# define glthread_recursive_lock_init(NAME) 0
|
||
|
|
# define glthread_recursive_lock_lock(NAME) 0
|
||
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|
# define glthread_recursive_lock_unlock(NAME) 0
|
||
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|
# define glthread_recursive_lock_destroy(NAME) 0
|
||
|
|
|
||
|
|
/* -------------------------- gl_once_t datatype -------------------------- */
|
||
|
|
|
||
|
|
typedef int gl_once_t;
|
||
|
|
# define gl_once_define(STORAGECLASS, NAME) \
|
||
|
|
STORAGECLASS gl_once_t NAME = 0;
|
||
|
|
# define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
||
|
|
(*(ONCE_CONTROL) == 0 ? (*(ONCE_CONTROL) = ~ 0, INITFUNCTION (), 0) : 0)
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ========================================================================= */
|
||
|
|
|
||
|
|
/* Macros with built-in error handling. */
|
||
|
|
|
||
|
|
/* -------------------------- gl_lock_t datatype -------------------------- */
|
||
|
|
|
||
|
|
#define gl_lock_init(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_lock_init (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_lock_lock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_lock_lock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_lock_unlock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_lock_unlock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_lock_destroy(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_lock_destroy (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
|
||
|
|
/* ------------------------- gl_rwlock_t datatype ------------------------- */
|
||
|
|
|
||
|
|
#define gl_rwlock_init(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_rwlock_init (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_rwlock_rdlock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_rwlock_rdlock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_rwlock_wrlock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_rwlock_wrlock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_rwlock_unlock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_rwlock_unlock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_rwlock_destroy(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_rwlock_destroy (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
|
||
|
|
/* --------------------- gl_recursive_lock_t datatype --------------------- */
|
||
|
|
|
||
|
|
#define gl_recursive_lock_init(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_recursive_lock_init (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_recursive_lock_lock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_recursive_lock_lock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_recursive_lock_unlock(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_recursive_lock_unlock (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
#define gl_recursive_lock_destroy(NAME) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_recursive_lock_destroy (&NAME)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
|
||
|
|
/* -------------------------- gl_once_t datatype -------------------------- */
|
||
|
|
|
||
|
|
#define gl_once(NAME, INITFUNCTION) \
|
||
|
|
do \
|
||
|
|
{ \
|
||
|
|
if (glthread_once (&NAME, INITFUNCTION)) \
|
||
|
|
abort (); \
|
||
|
|
} \
|
||
|
|
while (0)
|
||
|
|
|
||
|
|
/* ========================================================================= */
|
||
|
|
|
||
|
|
#endif /* _LOCK_H */
|