Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-22 22:03:34 +08:00 · 2012-09-17 18:18:44 +00:00
commit 57623d42eb
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+/****************************************************************************
+ * sched/pthread_initialize.c
+ *
+ *   Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <semaphore.h>
+#include <errno.h>
+
+#include "pthread_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/* This is the head of a private singly linked list.  It
+ * is used to retain information about the spawned threads.
+ */
+
+FAR join_t *g_pthread_head = NULL;
+FAR join_t *g_pthread_tail = NULL;
+
+/* Mutually exclusive access to this data set is enforced with
+ * the following (un-named) semaphore.
+ */
+
+sem_t g_join_semaphore;
+
+/* This keys track of the number of global keys that have been
+ * allocated.
+ */
+
+uint8_t g_pthread_num_keys;
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pthread_initialize
+ *
+ * Description:
+ *   This is an internal OS function called only at power-up boot time.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+void pthread_initialize(void)
+{
+  /* Initialize some global variables */
+
+  g_pthread_head          = NULL;
+  g_pthread_tail          = NULL;
+  g_pthread_num_keys      = 0;
+
+  /* Initialize the join semaphore to one (to support one-at-
+   * a-time access to private data sets).
+   */
+
+  (void)sem_init(&g_join_semaphore, 0, 1);
+}
+
+/****************************************************************************
+ * Name: pthread_takesemaphore and pthread_givesemaphore
+ *
+ * Description:
+ *   Support managed access to the private data sets.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   0 on success or an ERROR on failure with errno value set to EINVAL.
+ *   Note that the errno EINTR is never returned by this function.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_takesemaphore(sem_t *sem)
+{
+  /* Verify input parameters */
+
+  if (sem)
+    {
+      /* Take the semaphore */
+
+      while (sem_wait(sem) != OK)
+        {
+          /* Handle the special case where the semaphore wait was
+           * awakened by the receipt of a signal.
+           */
+
+          if (get_errno() != EINTR)
+            {
+              set_errno(EINVAL);
+              return ERROR;
+            }
+        }
+      return OK;
+    }
+  else
+    {
+      /* NULL semaphore pointer! */
+
+      set_errno(EINVAL);
+      return ERROR;
+    }
+}
+
+int pthread_givesemaphore(sem_t *sem)
+{
+  /* Verify input parameters */
+
+  if (sem)
+    {
+      /* Give the semaphore */
+
+      if (sem_post(sem) == OK)
+        {
+          return OK;
+        }
+      else
+        {
+          /* sem_post() reported an error */
+
+          set_errno(EINVAL);
+          return ERROR;
+        }
+    }
+  else
+    {
+      /* NULL semaphore pointer! */
+
+      set_errno(EINVAL);
+      return ERROR;
+    }
+}
+