diff options
Diffstat (limited to 'nuttx/sched/sig_unmaskpendingsignal.c')
-rw-r--r-- | nuttx/sched/sig_unmaskpendingsignal.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/nuttx/sched/sig_unmaskpendingsignal.c b/nuttx/sched/sig_unmaskpendingsignal.c new file mode 100644 index 0000000000..c27ad12668 --- /dev/null +++ b/nuttx/sched/sig_unmaskpendingsignal.c @@ -0,0 +1,135 @@ +/************************************************************ + * sig_unmaskpendingsignal.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.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 + ************************************************************/ + +/************************************************************ + * Function: 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) +{ + _TCB *rtcb = (_TCB*)g_readytorun.head; + sigset_t unmaskedset; + 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(); +} |