From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 .../SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c   | 113 +++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c

(limited to 'contrib/SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c')

diff --git a/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c b/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c
new file mode 100644
index 0000000..3cf02e5
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/thread/pthread/SDL_sysrwlock.c
@@ -0,0 +1,113 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <errno.h>
+#include <pthread.h>
+
+struct SDL_RWLock
+{
+    pthread_rwlock_t id;
+};
+
+
+SDL_RWLock *SDL_CreateRWLock(void)
+{
+    SDL_RWLock *rwlock;
+
+    // Allocate the structure
+    rwlock = (SDL_RWLock *)SDL_calloc(1, sizeof(*rwlock));
+    if (rwlock) {
+        if (pthread_rwlock_init(&rwlock->id, NULL) != 0) {
+            SDL_SetError("pthread_rwlock_init() failed");
+            SDL_free(rwlock);
+            rwlock = NULL;
+        }
+    }
+    return rwlock;
+}
+
+void SDL_DestroyRWLock(SDL_RWLock *rwlock)
+{
+    if (rwlock) {
+        pthread_rwlock_destroy(&rwlock->id);
+        SDL_free(rwlock);
+    }
+}
+
+void SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
+{
+    if (rwlock) {
+        const int rc = pthread_rwlock_rdlock(&rwlock->id);
+        SDL_assert(rc == 0);  // assume we're in a lot of trouble if this assert fails.
+    }
+}
+
+void SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
+{
+    if (rwlock) {
+        const int rc = pthread_rwlock_wrlock(&rwlock->id);
+        SDL_assert(rc == 0);  // assume we're in a lot of trouble if this assert fails.
+    }
+}
+
+bool SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
+{
+    bool result = true;
+
+    if (rwlock) {
+        const int rc = pthread_rwlock_tryrdlock(&rwlock->id);
+        if (rc != 0) {
+            result = false;
+            if (rc != EBUSY) {
+                SDL_assert(!"Error trying to lock rwlock for reading");  // assume we're in a lot of trouble if this assert fails.
+            }
+        }
+    }
+
+    return result;
+}
+
+bool SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
+{
+    bool result = true;
+
+    if (rwlock) {
+        const int rc = pthread_rwlock_trywrlock(&rwlock->id);
+        if (rc != 0) {
+            result = false;
+            if (rc != EBUSY) {
+                SDL_assert(!"Error trying to lock rwlock for writing");  // assume we're in a lot of trouble if this assert fails.
+            }
+        }
+    }
+
+    return result;
+}
+
+void SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS  // clang doesn't know about NULL mutexes
+{
+    if (rwlock) {
+        const int rc = pthread_rwlock_unlock(&rwlock->id);
+        SDL_assert(rc == 0);  // assume we're in a lot of trouble if this assert fails.
+    }
+}
+
-- 
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