1 files changed, 138 insertions, 0 deletions
diff --git a/nuttx/sched/sig_unmaskpendingsignal.c b/nuttx/sched/sig_unmaskpendingsignal.c
new file mode 100644
index 000000000..a7bcc7a29
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+++ b/nuttx/sched/sig_unmaskpendingsignal.c
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+/************************************************************************
+ * sched/sig_unmaskpendingsignal.c
+ *
+ *   Copyright (C) 2007, 2009 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 <sched.h>
+
+#include "os_internal.h"
+#include "sig_internal.h"
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Function Prototypes
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: sig_unmaskpendingsignal
+ *
+ * Description:
+ *   Based upon the current setting of the sigprocmask, this function
+ *   unmasks and processes any pending signals.  This function should
+ *   be called whenever the sigprocmask is changed.
+ *
+ ************************************************************************/
+
+void sig_unmaskpendingsignal(void)
+{
+   FAR _TCB       *rtcb = (FAR _TCB*)g_readytorun.head;
+   sigset_t        unmaskedset;
+   FAR sigpendq_t *pendingsig;
+   int             signo;
+
+   /* Prohibit any context switches until we are done with this.
+    * We may still be performing signal operations from interrupt
+    * handlers, however, none of the pending signals that we
+    * are concerned with here should be effected.
+    */
+
+   sched_lock();
+
+   /* Get the set of pending signals that were just unmasked.  The
+    * following operation should be safe because the sigprocmask
+    * can only be changed on this thread of execution.
+    */
+
+   unmaskedset = ~(rtcb->sigprocmask) & sig_pendingset(rtcb);
+
+   /* Loop while there are unmasked pending signals to be processed. */
+
+   while (unmaskedset != NULL_SIGNAL_SET)
+    {
+      /* Pending signals will be processed from lowest numbered signal
+       * to highest
+       */
+
+      signo = sig_lowest(&unmaskedset);
+      if (signo != ERROR)
+        {
+          /* Remove the signal from the set of unmasked signals.  NOTE:
+           * this implicitly assumes that only one instance for a given
+           * signal number is pending.
+           */
+
+          sigdelset(&unmaskedset, signo);
+
+          /* Remove the pending signal from the list of pending signals */
+
+          if ((pendingsig = sig_removependingsignal(rtcb, signo)) != NULL)
+            {
+              /* If there is one, then process it like a normal signal */
+
+              sig_received(rtcb, &pendingsig->info);
+
+              /* Then remove it from the pending signal list */
+
+              sig_releasependingsignal(pendingsig);
+            }
+        }
+    }
+
+  sched_unlock();
+}
+