X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust%2Fcompat_futex.c;fp=liblttng-ust%2Fcompat_futex.c;h=0000000000000000000000000000000000000000;hb=9d4c8b2d907edb9ebc9bfde55602598e7ba0832e;hp=adf1f44033154144b24f2602b3a4b24c03374c42;hpb=6ba6fd60507f8e045bdc4f1be14e9d99c6a15f7f;p=lttng-ust.git

diff --git a/liblttng-ust/compat_futex.c b/liblttng-ust/compat_futex.c
deleted file mode 100644
index adf1f440..00000000
--- a/liblttng-ust/compat_futex.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * SPDX-License-Identifier: LGPL-2.1-or-later
- *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Userspace RCU library - sys_futex compatibility code
- */
-
-#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/system.h>
-#include "futex.h"
-
-/*
- * Using attribute "weak" for __lttng_ust_compat_futex_lock and
- * __lttng_ust_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 __lttng_ust_compat_futex_lock = PTHREAD_MUTEX_INITIALIZER;
-__attribute__((weak))
-pthread_cond_t __lttng_ust_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 lttng_ust_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(&__lttng_ust_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(&__lttng_ust_compat_futex_cond,
-				&__lttng_ust_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(&__lttng_ust_compat_futex_cond);
-		break;
-	default:
-		errno = EINVAL;
-		ret = -1;
-	}
-	lockret = pthread_mutex_unlock(&__lttng_ust_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 lttng_ust_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;
-}