From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/thread/pthread_rwlock_unlock.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/thread/pthread_rwlock_unlock.c

(limited to 'src/thread/pthread_rwlock_unlock.c')

diff --git a/src/thread/pthread_rwlock_unlock.c b/src/thread/pthread_rwlock_unlock.c
new file mode 100644
index 0000000..9ae27ad
--- /dev/null
+++ b/src/thread/pthread_rwlock_unlock.c
@@ -0,0 +1,20 @@
+#include "pthread_impl.h"
+
+int __pthread_rwlock_unlock(pthread_rwlock_t *rw)
+{
+	int val, cnt, waiters, new, priv = rw->_rw_shared^128;
+
+	do {
+		val = rw->_rw_lock;
+		cnt = val & 0x7fffffff;
+		waiters = rw->_rw_waiters;
+		new = (cnt == 0x7fffffff || cnt == 1) ? 0 : val-1;
+	} while (a_cas(&rw->_rw_lock, val, new) != val);
+
+	if (!new && (waiters || val<0))
+		__wake(&rw->_rw_lock, cnt, priv);
+
+	return 0;
+}
+
+weak_alias(__pthread_rwlock_unlock, pthread_rwlock_unlock);
-- 
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