import RT-Thread@9217865c without bsp, libcpu and components/net

examples/libc/sem.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <stdio.h>
+
+static sem_t sema;
+static void* other_thread()
+{
+    printf("other_thread here!\n");
+
+    sleep(1);
+
+    while (1)
+    {
+        printf("other_thread: sem_post...\n");
+        if(sem_post(&sema) == -1)
+            printf("sem_post failed\n");
+        sleep(1);
+    }
+
+    printf("other_thread dies!\n");
+    pthread_exit(0);
+}
+
+static void test_thread(void* parameter)
+{
+    pthread_t tid;
+
+    printf("main thread here!\n");
+    printf("sleep 5 seconds...");
+    sleep(5);
+    printf("done\n");
+
+    sem_init(&sema, 0, 0);
+
+    /* create the "other" thread */
+    if(pthread_create(&tid, 0, &other_thread, 0)!=0)
+        /* error */
+        printf("pthread_create OtherThread failed.\n");
+    else
+        printf("created OtherThread=%x\n", tid);
+
+    /* let the other thread run */
+    while (1)
+    {
+        printf("Main: sem_wait...\n");
+        if(sem_wait(&sema) == -1)
+            printf("sem_wait failed\n");
+        printf("Main back.\n\n");
+    }
+
+    pthread_exit(0);
+}
+#include <finsh.h>
+void libc_sem()
+{
+    rt_thread_t tid;
+
+    tid = rt_thread_create("semtest", test_thread, RT_NULL,
+        2048, 20, 5);
+    if (tid != RT_NULL)
+    {
+        rt_thread_startup(tid);
+    }
+}
+FINSH_FUNCTION_EXPORT(libc_sem, posix semaphore test);