fix: handle EINTR correctly in get_cpu_mask_from_sysfs

[urcu.git] / include / urcu / static / urcu-bp.h

diff --git a/include/urcu/static/urcu-bp.h b/include/urcu/static/urcu-bp.h
index b163a900f30226070916bdead73082340d10899d..e660154094e7a3f568798f329ba121302788e8ce 100644 (file)
--- a/include/urcu/static/urcu-bp.h
+++ b/include/urcu/static/urcu-bp.h
@@ -1,31 +1,17 @@
+// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+// SPDX-FileCopyrightText: 2009 Paul E. McKenney, IBM Corporation.
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 #ifndef _URCU_BP_STATIC_H
 #define _URCU_BP_STATIC_H
 
 /*
- * urcu-bp-static.h
- *
  * Userspace RCU header.
  *
  * TO BE INCLUDED ONLY IN CODE THAT IS TO BE RECOMPILED ON EACH LIBURCU
  * RELEASE. See urcu.h for linking dynamically with the userspace rcu library.
  *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
- *
- * 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
- *
  * IBM's contributions to this file may be relicensed under LGPLv2 or later.
  */
 
@@ -33,6 +19,7 @@
 #include <pthread.h>
 #include <unistd.h>
 
+#include <urcu/annotate.h>
 #include <urcu/debug.h>
 #include <urcu/config.h>
 #include <urcu/compiler.h>
@@ -117,7 +104,8 @@ static inline void urcu_bp_smp_mb_slave(void)
                cmm_smp_mb();
 }
 
-static inline enum urcu_bp_state urcu_bp_reader_state(unsigned long *ctr)
+static inline enum urcu_bp_state urcu_bp_reader_state(unsigned long *ctr,
+                                               cmm_annotate_t *group)
 {
        unsigned long v;
 
@@ -127,7 +115,9 @@ static inline enum urcu_bp_state urcu_bp_reader_state(unsigned long *ctr)
         * Make sure both tests below are done on the same version of *value
         * to insure consistency.
         */
-       v = CMM_LOAD_SHARED(*ctr);
+       v = uatomic_load(ctr, CMM_RELAXED);
+       cmm_annotate_group_mem_acquire(group, ctr);
+
        if (!(v & URCU_BP_GP_CTR_NEST_MASK))
                return URCU_BP_READER_INACTIVE;
        if (!((v ^ urcu_bp_gp.ctr) & URCU_BP_GP_CTR_PHASE))
@@ -181,12 +171,14 @@ static inline void _urcu_bp_read_lock(void)
 static inline void _urcu_bp_read_unlock(void)
 {
        unsigned long tmp;
+       unsigned long *ctr = &URCU_TLS(urcu_bp_reader)->ctr;
 
        tmp = URCU_TLS(urcu_bp_reader)->ctr;
        urcu_assert_debug(tmp & URCU_BP_GP_CTR_NEST_MASK);
        /* Finish using rcu before decrementing the pointer. */
        urcu_bp_smp_mb_slave();
-       _CMM_STORE_SHARED(URCU_TLS(urcu_bp_reader)->ctr, tmp - URCU_BP_GP_COUNT);
+       cmm_annotate_mem_release(ctr);
+       uatomic_store(ctr, tmp - URCU_BP_GP_COUNT, CMM_RELAXED);
        cmm_barrier();  /* Ensure the compiler does not reorder us with mutex */
 }