Revert "Reimplement `RwMutex` on non-windows systems"

This reverts commit e9d20a9b4a069815f76a23ce5f429862b155b2d6.

src/threading.cpp

@@ -423,44 +423,28 @@ gb_internal void semaphore_wait(Semaphore *s) {
 	}
 
 	struct RwMutex {
-		BlockingMutex lock;
-		Condition     cond;
-		int32_t       readers;
+		// TODO(bill): make this a proper RW mutex
+		BlockingMutex mutex;
 	};
 
 	gb_internal void rw_mutex_lock(RwMutex *m) {
-		mutex_lock(&m->lock);
-		while (m->readers != 0) {
-			condition_wait(&m->cond, &m->lock);
-		}
+		mutex_lock(&m->mutex);
 	}
 	gb_internal bool rw_mutex_try_lock(RwMutex *m) {
-		// TODO(bill): rw_mutex_try_lock
-		rw_mutex_lock(m);
-		return true;
+		return mutex_try_lock(&m->mutex);
 	}
 	gb_internal void rw_mutex_unlock(RwMutex *m) {
-		condition_signal(&m->cond);
-		mutex_unlock(&m->lock);
+		mutex_unlock(&m->mutex);
 	}
 
 	gb_internal void rw_mutex_shared_lock(RwMutex *m) {
-		mutex_lock(&m->lock);
-		m->readers += 1;
-		mutex_unlock(&m->lock);
+		mutex_lock(&m->mutex);
 	}
 	gb_internal bool rw_mutex_try_shared_lock(RwMutex *m) {
-		// TODO(bill): rw_mutex_try_shared_lock
-		rw_mutex_shared_lock(m);
-		return true;
+		return mutex_try_lock(&m->mutex);
 	}
 	gb_internal void rw_mutex_shared_unlock(RwMutex *m) {
-		mutex_lock(&m->lock);
-		m->readers -= 1;
-		if (m->readers == 0) {
-			condition_signal(&m->cond);
-		}
-		mutex_unlock(&m->lock);
+		mutex_unlock(&m->mutex);
 	}
 #endif