linux-generic: rwlock: implement trylock variants of rwlock and rwlock_recursive

Signed-off-by: Bill Fischofer <bill.fischofer@linaro.org>
Reviewed-by: Petri Savolainen <petri.savolainen@nokia.com>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/platform/linux-generic/odp_rwlock.c b/platform/linux-generic/odp_rwlock.c
index f50fd5f2a..13c17a2c7 100644
--- a/platform/linux-generic/odp_rwlock.c
+++ b/platform/linux-generic/odp_rwlock.c
@@ -31,6 +31,13 @@ void odp_rwlock_read_lock(odp_rwlock_t *rwlock)
 	}
 }
 
+int odp_rwlock_read_trylock(odp_rwlock_t *rwlock)
+{
+	uint32_t zero = 0;
+
+	return odp_atomic_cas_acq_u32(&rwlock->cnt, &zero, (uint32_t)1);
+}
+
 void odp_rwlock_read_unlock(odp_rwlock_t *rwlock)
 {
 	odp_atomic_sub_rel_u32(&rwlock->cnt, 1);
@@ -54,6 +61,13 @@ void odp_rwlock_write_lock(odp_rwlock_t *rwlock)
 	}
 }
 
+int odp_rwlock_write_trylock(odp_rwlock_t *rwlock)
+{
+	uint32_t zero = 0;
+
+	return odp_atomic_cas_acq_u32(&rwlock->cnt, &zero, (uint32_t)-1);
+}
+
 void odp_rwlock_write_unlock(odp_rwlock_t *rwlock)
 {
 	odp_atomic_store_rel_u32(&rwlock->cnt, 0);