X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=compat_futex.c;fp=compat_futex.c;h=0000000000000000000000000000000000000000;hp=9e918fe8e2aac035dc39e6e23868410348d02627;hb=6893800a4d1cc14dff0395ddcd660a5138db183d;hpb=a59f39055b5ecb77b68cf78b9839aa9e8e4ec332

diff --git a/compat_futex.c b/compat_futex.c
deleted file mode 100644
index 9e918fe..0000000
--- a/compat_futex.c
+++ /dev/null
@@ -1,154 +0,0 @@
-/*
- * compat_futex.c
- *
- * Userspace RCU library - sys_futex compatibility code
- *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <stdio.h>
-#include <pthread.h>
-#include <signal.h>
-#include <assert.h>
-#include <errno.h>
-#include <poll.h>
-#include <stdint.h>
-
-#include <urcu/arch.h>
-#include <urcu/futex.h>
-#include <urcu/system.h>
-
-/*
- * Using attribute "weak" for __urcu_compat_futex_lock and
- * __urcu_compat_futex_cond. Those are globally visible by the entire
- * program, even though many shared objects may have their own version.
- * The first version that gets loaded will be used by the entire program
- * (executable and all shared objects).
- */
-
-__attribute__((weak))
-pthread_mutex_t __urcu_compat_futex_lock = PTHREAD_MUTEX_INITIALIZER;
-__attribute__((weak))
-pthread_cond_t __urcu_compat_futex_cond = PTHREAD_COND_INITIALIZER;
-
-/*
- * _NOT SIGNAL-SAFE_. pthread_cond is not signal-safe anyway. Though.
- * For now, timeout, uaddr2 and val3 are unused.
- * Waiter will relinquish the CPU until woken up.
- */
-
-int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
-	const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
-{
-	int ret = 0, lockret;
-
-	/*
-	 * Check if NULL. Don't let users expect that they are taken into
-	 * account.
-	 */
-	assert(!timeout);
-	assert(!uaddr2);
-	assert(!val3);
-
-	/*
-	 * memory barriers to serialize with the previous uaddr modification.
-	 */
-	cmm_smp_mb();
-
-	lockret = pthread_mutex_lock(&__urcu_compat_futex_lock);
-	if (lockret) {
-		errno = lockret;
-		ret = -1;
-		goto end;
-	}
-	switch (op) {
-	case FUTEX_WAIT:
-		/*
-		 * Wait until *uaddr is changed to something else than "val".
-		 * Comparing *uaddr content against val figures out which
-		 * thread has been awakened.
-		 */
-		while (CMM_LOAD_SHARED(*uaddr) == val)
-			pthread_cond_wait(&__urcu_compat_futex_cond,
-				&__urcu_compat_futex_lock);
-		break;
-	case FUTEX_WAKE:
-		/*
-		 * Each wake is sending a broadcast, thus attempting wakeup of
-		 * all awaiting threads, independently of their respective
-		 * uaddr.
-		 */
-		pthread_cond_broadcast(&__urcu_compat_futex_cond);
-		break;
-	default:
-		errno = EINVAL;
-		ret = -1;
-	}
-	lockret = pthread_mutex_unlock(&__urcu_compat_futex_lock);
-	if (lockret) {
-		errno = lockret;
-		ret = -1;
-	}
-end:
-	return ret;
-}
-
-/*
- * _ASYNC SIGNAL-SAFE_.
- * For now, timeout, uaddr2 and val3 are unused.
- * Waiter will busy-loop trying to read the condition.
- * It is OK to use compat_futex_async() on a futex address on which
- * futex() WAKE operations are also performed.
- */
-
-int compat_futex_async(int32_t *uaddr, int op, int32_t val,
-	const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
-{
-	int ret = 0;
-
-	/*
-	 * Check if NULL. Don't let users expect that they are taken into
-	 * account.
-	 */
-	assert(!timeout);
-	assert(!uaddr2);
-	assert(!val3);
-
-	/*
-	 * Ensure previous memory operations on uaddr have completed.
-	 */
-	cmm_smp_mb();
-
-	switch (op) {
-	case FUTEX_WAIT:
-		while (CMM_LOAD_SHARED(*uaddr) == val) {
-			if (poll(NULL, 0, 10) < 0) {
-				ret = -1;
-				/* Keep poll errno. Caller handles EINTR. */
-				goto end;
-			}
-		}
-		break;
-	case FUTEX_WAKE:
-		break;
-	default:
-		errno = EINVAL;
-		ret = -1;
-	}
-end:
-	return ret;
-}