--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-thread-priority.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,105 @@
+/* Copyright libuv contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "uv.h"
+#include "task.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h> /* memset */
+
+#ifdef __POSIX__
+#include <pthread.h>
+#include <errno.h>
+#endif
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+
+uv_sem_t sem;
+
+static void simple_task(void *args) {
+  uv_sem_wait(&sem);
+  printf("in simple_task\n");
+}
+
+TEST_IMPL(thread_priority) {
+  int priority;
+#ifndef _WIN32
+  int min;
+  int max;
+  int policy;
+  struct sched_param param;
+#endif
+  uv_thread_t task_id;
+
+  /* Verify that passing a NULL pointer returns UV_EINVAL. */
+  ASSERT_EQ(UV_EINVAL, uv_thread_getpriority(0, NULL));
+  ASSERT_OK(uv_sem_init(&sem, 1));
+  uv_sem_wait(&sem);
+  ASSERT_OK(uv_thread_create(&task_id, simple_task, NULL));
+  ASSERT_OK(uv_thread_getpriority(task_id, &priority));
+
+#ifdef _WIN32
+  ASSERT_EQ(priority, THREAD_PRIORITY_NORMAL);
+#else
+  ASSERT_OK(pthread_getschedparam(task_id, &policy, &param));
+#ifdef __PASE__
+  min = 1;
+  max = 127;
+#else
+  min = sched_get_priority_min(policy);
+  max = sched_get_priority_max(policy);
+#endif
+  ASSERT(priority >= min && priority <= max);
+#endif
+
+  ASSERT_OK(uv_thread_setpriority(task_id, UV_THREAD_PRIORITY_LOWEST));
+  ASSERT_OK(uv_thread_getpriority(task_id, &priority));
+
+#ifdef _WIN32
+  ASSERT_EQ(priority, THREAD_PRIORITY_LOWEST);
+#else
+  ASSERT_EQ(priority, min);
+#endif
+
+/**
+ * test set nice value for the calling thread with default schedule policy
+*/
+#ifdef __linux__
+  ASSERT_OK(uv_thread_getpriority(pthread_self(), &priority));
+  ASSERT_EQ(priority, 0);
+  ASSERT_OK(uv_thread_setpriority(pthread_self(), UV_THREAD_PRIORITY_LOWEST));
+  ASSERT_OK(uv_thread_getpriority(pthread_self(), &priority));
+  ASSERT_EQ(priority, (0 - UV_THREAD_PRIORITY_LOWEST * 2));
+#endif
+
+  uv_sem_post(&sem);
+
+  ASSERT_OK(uv_thread_join(&task_id));
+
+  uv_sem_destroy(&sem);
+
+  return 0;
+}
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