1 files changed, 141 insertions, 0 deletions
diff --git a/c11/c11_cndvar01/test.c b/c11/c11_cndvar01/test.c
new file mode 100644
index 0000000..451c7c2
--- /dev/null
+++ b/c11/c11_cndvar01/test.c
@@ -0,0 +1,141 @@
+/**
+ *  @brief C11 Threads Example
+ */
+
+/*
+ * This file's license is 2-clause BSD as in this distribution's
+ * LICENSE.2 file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <threads.h>
+#include <assert.h>
+
+static thrd_t   thread1;
+static mtx_t    buffer_mutex;
+static cnd_t    buffer_cnd;
+static int      buffer_value;
+
+static int buffer_init(void)
+{
+  int     rc;
+
+  puts("buffer - mtx_init()");
+  rc = mtx_init(&buffer_mutex, mtx_timed);
+  assert(rc == thrd_success);
+
+  puts("buffer - cnd_init()");
+  rc = cnd_init(&buffer_cnd);
+  assert(rc == thrd_success);
+
+  buffer_value = -1;
+}
+
+void buffer_destroy(void)
+{
+  puts("buffer - mtx_destroy()" );
+  mtx_destroy(&buffer_mutex);
+
+  puts("buffer - cnd_destroy()" );
+  cnd_destroy(&buffer_cnd);
+}
+
+static int buffer_get(void)
+{
+  int     rc;
+  int     value;
+
+  // puts("buffer - mtx_lock()");
+  rc = mtx_lock(&buffer_mutex);
+  assert(rc == thrd_success);
+
+    while (buffer_value == -1) {
+      // puts("buffer - cnd_wait()");
+      rc = cnd_wait(&buffer_cnd, &buffer_mutex);
+      assert(rc = thrd_success);
+    }
+
+    value = buffer_value;
+    buffer_value = -1;
+    // puts("buffer - return value");
+    
+
+  // puts("buffer - mtx_unlock()");
+  rc = mtx_unlock(&buffer_mutex);
+  assert(rc == thrd_success);
+
+  return value;
+}
+
+static void buffer_put(int value)
+{
+  int     rc;
+  int     old_value;
+
+  // puts("buffer - mtx_lock()");
+  rc = mtx_lock(&buffer_mutex);
+  assert(rc == thrd_success);
+
+    old_value = buffer_value;
+    buffer_value = value;
+
+    if (old_value == -1) {
+      // puts("buffer - cnd_signal()");
+      rc = cnd_signal(&buffer_cnd);
+      assert(rc = thrd_success);
+    }
+
+  // puts("buffer - mtx_unlock()");
+  rc = mtx_unlock(&buffer_mutex);
+  assert(rc == thrd_success);
+
+}
+
+int Thread1_Body(void *arg)
+{
+  int     rc;
+  int     value;
+
+  (void) arg;
+
+  puts("Thread1 - Loop for values");
+  while (1) {
+    value = buffer_get();
+    printf("Thread1 value = %d\n", value);
+  }
+
+  return 0;
+}
+
+int main(int argc, char **argv)
+{
+  int             rc;
+  int             value;
+  struct timespec delay = {1, 0};
+
+  puts("*** START OF C11 CONDITION VARIABLE EXAMPLE ***");
+
+  puts("main - Create Thread1");
+  rc = thrd_create(&thread1, Thread1_Body, &thread1);
+  assert(rc == thrd_success);
+
+  buffer_init();
+
+  puts("main - yield to Thread1" );
+  thrd_yield();
+
+  for (value=1 ; value <= 3 ; value++) {
+    printf("main - put value = %d\n", value * 10);
+    buffer_put(value * 10);
+
+    puts("main - sleep to let Thread1 get the value");
+    rc = thrd_sleep(&delay, NULL);
+    assert(rc == 0);
+  }
+
+  buffer_destroy();
+
+  puts("*** END OF C11 CONDITION VARIABLE EXAMPLE ***");
+  return 0;
+}