Decoupling work queue data structures. This is part of the preparation to support multiple low-priority worker threads

2026-06-06 00:14:22 +08:00 · 2014-10-10 08:35:58 -06:00
parent 6220256a09
commit 1afc9773ac
16 changed files with 660 additions and 132 deletions
@@ -0,0 +1,127 @@
+/****************************************************************************
+ * sched/wqueue/work_signal.c
+ *
+ *   Copyright (C) 2014 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 <signal.h>
+#include <errno.h>
+
+#include <nuttx/wqueue.h>
+
+#include "wqueue/wqueue.h"
+
+#ifdef CONFIG_SCHED_WORKQUEUE
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: work_signal
+ *
+ * Description:
+ *   Signal the worker thread to process the work queue now.  This function
+ *   is used internally by the work logic but could also be used by the
+ *   user to force an immediate re-assessment of pending work.
+ *
+ * Input parameters:
+ *   qid    - The work queue ID
+ *
+ * Returned Value:
+ *   Zero on success, a negated errno on failure
+ *
+ ****************************************************************************/
+
+int work_signal(int qid)
+{
+  pid_t pid;
+  int ret;
+
+  /* Get the process ID of the worker thread */
+
+#ifdef CONFIG_SCHED_HPWORK
+  if (qid == HPWORK)
+    {
+      pid = g_hpwork.pid;
+    }
+  else
+#endif
+#ifdef CONFIG_SCHED_LPWORK
+  if (qid == LPWORK)
+    {
+      pid = g_lpwork.pid;
+    }
+  else
+#endif
+    {
+      return -EINVAL;
+    }
+
+  /* Signal the worker thread */
+
+  ret = kill(pid, SIGWORK);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      return -errcode;
+    }
+
+  return OK;
+}
+
+#endif /* CONFIG_SCHED_WORKQUEUE */