1 files changed, 140 insertions, 0 deletions
diff --git a/platform/linux-generic/include/odp/api/plat/rwlock_recursive_inlines.h b/platform/linux-generic/include/odp/api/plat/rwlock_recursive_inlines.h
new file mode 100644
index 000000000..ab9a03e21
--- /dev/null
+++ b/platform/linux-generic/include/odp/api/plat/rwlock_recursive_inlines.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 2013-2018 Linaro Limited
+ * Copyright (c) 2022 Nokia
+ */
+
+#ifndef ODP_PLAT_RWLOCK_RECURSIVE_INLINES_H_
+#define ODP_PLAT_RWLOCK_RECURSIVE_INLINES_H_
+
+#include <odp/api/rwlock.h>
+#include <odp/api/thread.h>
+
+#include <odp/api/abi/rwlock_recursive.h>
+
+#include <odp/api/plat/debug_inlines.h>
+
+#include <stdint.h>
+#include <string.h>
+
+/** @cond _ODP_HIDE_FROM_DOXYGEN_ */
+
+#ifndef _ODP_NO_INLINE
+	/* Inline functions by default */
+	#define _ODP_INLINE static inline
+	#define odp_rwlock_recursive_init __odp_rwlock_recursive_init
+	#define odp_rwlock_recursive_read_lock __odp_rwlock_recursive_read_lock
+	#define odp_rwlock_recursive_read_trylock __odp_rwlock_recursive_read_trylock
+	#define odp_rwlock_recursive_read_unlock __odp_rwlock_recursive_read_unlock
+	#define odp_rwlock_recursive_write_lock __odp_rwlock_recursive_write_lock
+	#define odp_rwlock_recursive_write_trylock __odp_rwlock_recursive_write_trylock
+	#define odp_rwlock_recursive_write_unlock __odp_rwlock_recursive_write_unlock
+#else
+	#undef _ODP_INLINE
+	#define _ODP_INLINE
+#endif
+
+_ODP_INLINE void odp_rwlock_recursive_init(odp_rwlock_recursive_t *rlock)
+{
+	memset(rlock, 0, sizeof(odp_rwlock_recursive_t));
+	odp_rwlock_init(&rlock->lock);
+	rlock->wr_owner = -1;
+}
+
+/* Multiple readers can recurse the lock concurrently */
+_ODP_INLINE void odp_rwlock_recursive_read_lock(odp_rwlock_recursive_t *rlock)
+{
+	int thr = odp_thread_id();
+
+	if (rlock->rd_cnt[thr]) {
+		_ODP_ASSERT(rlock->rd_cnt[thr] < UINT8_MAX);
+		rlock->rd_cnt[thr]++;
+		return;
+	}
+
+	odp_rwlock_read_lock(&rlock->lock);
+	rlock->rd_cnt[thr] = 1;
+}
+
+/* Multiple readers can recurse the lock concurrently */
+_ODP_INLINE int odp_rwlock_recursive_read_trylock(odp_rwlock_recursive_t *rlock)
+{
+	int thr = odp_thread_id();
+
+	if (rlock->rd_cnt[thr]) {
+		_ODP_ASSERT(rlock->rd_cnt[thr] < UINT8_MAX);
+		rlock->rd_cnt[thr]++;
+		return 1;
+	}
+
+	if (odp_rwlock_read_trylock(&rlock->lock)) {
+		rlock->rd_cnt[thr] = 1;
+		return 1;
+	}
+
+	return 0;
+}
+
+_ODP_INLINE void odp_rwlock_recursive_read_unlock(odp_rwlock_recursive_t *rlock)
+{
+	int thr = odp_thread_id();
+
+	_ODP_ASSERT(rlock->rd_cnt[thr]);
+	rlock->rd_cnt[thr]--;
+
+	if (rlock->rd_cnt[thr] > 0)
+		return;
+
+	odp_rwlock_read_unlock(&rlock->lock);
+}
+
+/* Only one writer can recurse the lock */
+_ODP_INLINE void odp_rwlock_recursive_write_lock(odp_rwlock_recursive_t *rlock)
+{
+	int thr = odp_thread_id();
+
+	if (rlock->wr_owner == thr) {
+		_ODP_ASSERT(rlock->wr_cnt < UINT32_MAX);
+		rlock->wr_cnt++;
+		return;
+	}
+
+	odp_rwlock_write_lock(&rlock->lock);
+	rlock->wr_owner = thr;
+	rlock->wr_cnt   = 1;
+}
+
+/* Only one writer can recurse the lock */
+_ODP_INLINE int odp_rwlock_recursive_write_trylock(odp_rwlock_recursive_t *rlock)
+{
+	int thr = odp_thread_id();
+
+	if (rlock->wr_owner == thr) {
+		_ODP_ASSERT(rlock->wr_cnt < UINT32_MAX);
+		rlock->wr_cnt++;
+		return 1;
+	}
+
+	if (odp_rwlock_write_trylock(&rlock->lock)) {
+		rlock->wr_owner = thr;
+		rlock->wr_cnt   = 1;
+		return 1;
+	}
+
+	return 0;
+}
+
+_ODP_INLINE void odp_rwlock_recursive_write_unlock(odp_rwlock_recursive_t *rlock)
+{
+	_ODP_ASSERT(rlock->wr_cnt);
+	rlock->wr_cnt--;
+
+	if (rlock->wr_cnt > 0)
+		return;
+
+	rlock->wr_owner = -1;
+	odp_rwlock_write_unlock(&rlock->lock);
+}
+
+/** @endcond */
+
+#endif