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author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2011-12-19 19:24:09 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2011-12-19 19:24:09 +0000 |
commit | add995c32e86f9de8fa8fc05172435332c25a895 (patch) | |
tree | 0191fde92a5c4dcd55a24b2aa760fa4c88713242 /nuttx/sched/sig_deliver.c | |
download | px4-firmware-add995c32e86f9de8fa8fc05172435332c25a895.tar.gz px4-firmware-add995c32e86f9de8fa8fc05172435332c25a895.tar.bz2 px4-firmware-add995c32e86f9de8fa8fc05172435332c25a895.zip |
Completes coding of the PWM module
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4200 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/sched/sig_deliver.c')
-rw-r--r-- | nuttx/sched/sig_deliver.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/nuttx/sched/sig_deliver.c b/nuttx/sched/sig_deliver.c new file mode 100644 index 000000000..2244ca2fe --- /dev/null +++ b/nuttx/sched/sig_deliver.c @@ -0,0 +1,167 @@ +/**************************************************************************** + * sched/sig_deliver.c + * + * Copyright (C) 2007, 2008 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 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 <sys/types.h> +#include <signal.h> +#include <unistd.h> +#include <sched.h> +#include <debug.h> +#include <nuttx/arch.h> + +#include "os_internal.h" +#include "sem_internal.h" +#include "sig_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: sig_deliver + * + * Description: + * This function is called on the thread of execution of + * the signal receiving task. It processes all queued + * signals then returns. + * + ****************************************************************************/ + +void sig_deliver(FAR _TCB *stcb) +{ + pid_t rpid; + FAR sigq_t *sigq; + FAR sigq_t *next; + sigset_t savesigprocmask; + irqstate_t saved_state; + int saved_errno; + + sched_lock(); + + /* Save the thread errno. When we finished dispatching the + * signal actions and resume the task, the errno value must + * be unchanged by the operation of the signal handling. In + * particular, the EINTR indication that says that the task + * was reawakened by a signal must be retained. + */ + + saved_errno = stcb->pterrno; + for (sigq = (FAR sigq_t*)stcb->sigpendactionq.head; (sigq); sigq = next) + { + next = sigq->flink; + sdbg("Sending signal sigq=0x%x\n", sigq); + + /* Remove the signal structure from the sigpendactionq and place it + * in the sigpostedq. NOTE: Since signals are processed one at a + * time, there should never be more than one signal in the sigpostedq + */ + + saved_state = irqsave(); + sq_rem((FAR sq_entry_t*)sigq, &(stcb->sigpendactionq)); + sq_addlast((FAR sq_entry_t*)sigq, &(stcb->sigpostedq)); + irqrestore(saved_state); + + /* Call the signal handler (unless the signal was cancelled) + * + * Save a copy of the old sigprocmask and install the new + * (temporary) sigprocmask. The new sigprocmask is the union + * of the current sigprocmask and the sa_mask for the signal being + * delivered plus the signal being delivered. + */ + + savesigprocmask = stcb->sigprocmask; + stcb->sigprocmask = savesigprocmask | sigq->mask | SIGNO2SET(sigq->info.si_signo); + + /* The current tasks process.ID. We'll need this later to see if + * the signal handler caused a context switch. + */ + + rpid = getpid(); + + /* Deliver the signal */ + + (*sigq->action.sighandler)(sigq->info.si_signo, &sigq->info, NULL); + + /* Restore the original sigprocmask */ + + stcb->sigprocmask = savesigprocmask; + + /* Now, handle the (rare?) case where (a) a blocked signal was + * received while the signal handling executed but (b) restoring the + * original sigprocmask will unblock the signal. + */ + + sig_unmaskpendingsignal(); + + /* Remove the signal from the sigpostedq */ + + saved_state = irqsave(); + sq_rem((FAR sq_entry_t*)sigq, &(stcb->sigpostedq)); + irqrestore(saved_state); + + /* Then deallocate it */ + + sig_releasependingsigaction(sigq); + } + + stcb->pterrno = saved_errno; + sched_unlock(); +} + |