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Diffstat (limited to 'lib/libc/include/reentrant.h')
-rw-r--r-- | lib/libc/include/reentrant.h | 128 |
1 files changed, 0 insertions, 128 deletions
diff --git a/lib/libc/include/reentrant.h b/lib/libc/include/reentrant.h deleted file mode 100644 index 22a2325..0000000 --- a/lib/libc/include/reentrant.h +++ /dev/null @@ -1,128 +0,0 @@ -/*- - * Copyright (c) 1997,98 The NetBSD Foundation, Inc. - * All rights reserved. - * - * This code is derived from software contributed to The NetBSD Foundation - * by J.T. Conklin. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS - * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED - * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS - * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - * $FreeBSD$ - */ - -/* - * Requirements: - * - * 1. The thread safe mechanism should be lightweight so the library can - * be used by non-threaded applications without unreasonable overhead. - * - * 2. There should be no dependency on a thread engine for non-threaded - * applications. - * - * 3. There should be no dependency on any particular thread engine. - * - * 4. The library should be able to be compiled without support for thread - * safety. - * - * - * Rationale: - * - * One approach for thread safety is to provide discrete versions of the - * library: one thread safe, the other not. The disadvantage of this is - * that libc is rather large, and two copies of a library which are 99%+ - * identical is not an efficent use of resources. - * - * Another approach is to provide a single thread safe library. However, - * it should not add significant run time or code size overhead to non- - * threaded applications. - * - * Since the NetBSD C library is used in other projects, it should be - * easy to replace the mutual exclusion primitives with ones provided by - * another system. Similarly, it should also be easy to remove all - * support for thread safety completely if the target environment does - * not support threads. - * - * - * Implementation Details: - * - * The mutex primitives used by the library (mutex_t, mutex_lock, etc.) - * are macros which expand to the cooresponding primitives provided by - * the thread engine or to nothing. The latter is used so that code is - * not unreasonably cluttered with #ifdefs when all thread safe support - * is removed. - * - * The mutex macros can be directly mapped to the mutex primitives from - * pthreads, however it should be reasonably easy to wrap another mutex - * implementation so it presents a similar interface. - * - * Stub implementations of the mutex functions are provided with *weak* - * linkage. These functions simply return success. When linked with a - * thread library (i.e. -lpthread), the functions will override the - * stubs. - */ - -#include <pthread.h> -#include <pthread_np.h> -#include "libc_private.h" - -#define mutex_t pthread_mutex_t -#define cond_t pthread_cond_t -#define rwlock_t pthread_rwlock_t -#define once_t pthread_once_t - -#define thread_key_t pthread_key_t -#define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER -#define RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER -#define ONCE_INITIALIZER PTHREAD_ONCE_INIT - -#define mutex_init(m, a) _pthread_mutex_init(m, a) -#define mutex_lock(m) if (__isthreaded) \ - _pthread_mutex_lock(m) -#define mutex_unlock(m) if (__isthreaded) \ - _pthread_mutex_unlock(m) -#define mutex_trylock(m) (__isthreaded ? 0 : _pthread_mutex_trylock(m)) - -#define cond_init(c, a, p) _pthread_cond_init(c, a) -#define cond_signal(m) if (__isthreaded) \ - _pthread_cond_signal(m) -#define cond_broadcast(m) if (__isthreaded) \ - _pthread_cond_broadcast(m) -#define cond_wait(c, m) if (__isthreaded) \ - _pthread_cond_wait(c, m) - -#define rwlock_init(l, a) _pthread_rwlock_init(l, a) -#define rwlock_rdlock(l) if (__isthreaded) \ - _pthread_rwlock_rdlock(l) -#define rwlock_wrlock(l) if (__isthreaded) \ - _pthread_rwlock_wrlock(l) -#define rwlock_unlock(l) if (__isthreaded) \ - _pthread_rwlock_unlock(l) - -#define thr_keycreate(k, d) _pthread_key_create(k, d) -#define thr_setspecific(k, p) _pthread_setspecific(k, p) -#define thr_getspecific(k) _pthread_getspecific(k) -#define thr_sigsetmask(f, n, o) _pthread_sigmask(f, n, o) - -#define thr_once(o, i) _pthread_once(o, i) -#define thr_self() _pthread_self() -#define thr_exit(x) _pthread_exit(x) -#define thr_main() _pthread_main_np() |