Incorporate the work thread

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2230 42af7a65-404d-4744-a932-0658087f49c3

include/nuttx/rwbuffer.h

@@ -53,7 +53,7 @@
 #if defined(CONFIG_FS_WRITEBUFFER) || defined(CONFIG_FS_READAHEAD)
 
 /**********************************************************************
- * Definitions
+ * Pre-processor Definitions
  **********************************************************************/
 
 /**********************************************************************

include/nuttx/wqueue.h

@@ -42,6 +42,7 @@
 
 #include <nuttx/config.h>
 #include <sys/types.h>
+#include <signal.h>
 #include <queue.h>
 
 #ifdef CONFIG_SCHED_WORKQUEUE
@@ -132,6 +133,22 @@ EXTERN int work_queue(struct work_s *work, worker_t worker, FAR void *arg, uint3
 
 EXTERN int work_cancel(struct work_s *work);
 
+/****************************************************************************
+ * Name: work_signal
+ *
+ * Description:
+ *   Signal the worker thread to process the work queue now.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero on success, a negated errno on failure
+ *
+ ****************************************************************************/
+
+#define work_signal() kill(g_worker, SIGWORK)
+
 #undef EXTERN
 #ifdef __cplusplus
 }

include/signal.h

@@ -67,16 +67,45 @@
 #define SIGRTMIN        0  /* First real time signal */
 #define SIGRTMAX        31 /* Last real time signal */
 
-/* A few of the real time signals are used within the OS.  The reset are all
- * user signals:
+/* A few of the real time signals are used within the OS.  They have
+ * default values that can be overridden from the configuration file. The
+ * rest are all user signals:
  */
 
+#ifndef CONFIG_SIG_SIGUSR1
 #define SIGUSR1         0  /* User signal 1 */
+#else
+#define SIGUSR1         CONFIG_SIG_SIGUSR1
+#endif
+
+#ifndef CONFIG_SIG_SIGUSR2
 #define SIGUSR2         1  /* User signal 2 */
+#else
+#define SIGUSR2         CONFIG_SIG_SIGUSR2
+#endif
+
+#ifndef CONFIG_SIG_SIGALARM
 #define SIGALRM         2  /* Default signal used with POSIX timers (used only */
                            /* no other signal is provided) */
-#define SIGCONDTIMEDOUT 3  /* Used in the implementation of */
-                           /* pthread_cond_timedwait */
+#else
+#define SIGALRM         CONFIG_SIG_SIGALARM
+#endif
+
+#ifndef CONFIG_DISABLE_PTHREAD
+#ifndef CONFIG_SIG_SIGCONDTIMEDOUT
+#define SIGCONDTIMEDOUT 3  /* Used in the implementation of pthread_cond_timedwait */
+#else
+#define SIGCONDTIMEDOUT CONFIG_SIG_SIGCONDTIMEDOUT
+#endif
+#endif
+
+#ifdef CONFIG_SCHED_WORKQUEUE
+#ifndef CONFIG_SIG_SIGWORK
+#define SIGWORK         4  /* Used to wake up the work queue */
+#else
+#define SIGWORK         CONFIG_SIG_SIGWORK
+#endif
+#endif
 
 /* sigprocmask() "how" definitions. Only one of the following can be specified: */