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mq_receive/send: Return appropriate errnos and stop waiting if signal received. 

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@164 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2007-03-28 14:48:42 +00:00
parent b1ef98376d
commit 8700925a99
9 changed files with 527 additions and 260 deletions
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2
nuttx/ChangeLog
View File

@ -91,6 +91,8 @@
0.2.3 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
* mq_receive and mq_send now return errno's appropriately
* mq_receive and mq_send are now correctly awakened by signals.
* Started m68322

60
nuttx/examples/ostest/mqueue.c
View File

@ -37,13 +37,17 @@
* Included Files
**************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <pthread.h>
#include <mqueue.h>
#include <sched.h>
#include <errno.h>
#include "ostest.h"
@ -51,11 +55,18 @@
* Private Definitions
**************************************************************************/
#define TEST_MESSAGE "This is a test and only a test"
#define TEST_MESSAGE "This is a test and only a test"
#ifdef SDCC
#define TEST_MSGLEN (31)
#define TEST_MSGLEN (31)
#else
#define TEST_MSGLEN (strlen(TEST_MESSAGE)+1)
#define TEST_MSGLEN (strlen(TEST_MESSAGE)+1)
#endif
#define TEST_SEND_NMSGS (10)
#ifndef CONFIG_DISABLE_SIGNALS
# define TEST_RECEIVE_NMSGS (11)
#else
# define TEST_RECEIVE_NMSGS (10)
#endif
/**************************************************************************
@ -121,9 +132,9 @@ static void *sender_thread(void *arg)
memcpy(msg_buffer, TEST_MESSAGE, TEST_MSGLEN);
/* Perform the send 10 times */
/* Perform the send TEST_SEND_NMSGS times */
for (i = 0; i < 10; i++)
for (i = 0; i < TEST_SEND_NMSGS; i++)
{
status = mq_send(mqfd, msg_buffer, TEST_MSGLEN, 42);
if (status < 0)
@ -183,16 +194,27 @@ static void *receiver_thread(void *arg)
pthread_exit((pthread_addr_t)1);
}
/* Perform the receive 10 times */
/* Perform the receive TEST_RECEIVE_NMSGS times */
for (i = 0; i < 10; i++)
for (i = 0; i < TEST_RECEIVE_NMSGS; i++)
{
memset(msg_buffer, 0xaa, TEST_MSGLEN);
nbytes = mq_receive(mqfd, msg_buffer, TEST_MSGLEN, 0);
if (nbytes < 0)
{
printf("receiver_thread: ERROR mq_receive failure on msg %d\n", i);
nerrors++;
/* mq_receive failed. If the error is because of EINTR then
* it is not a failure.
*/
if (*get_errno_ptr() != EINTR)
{
printf("receiver_thread: ERROR mq_receive failure on msg %d, errno=%d\n", i, *get_errno_ptr());
nerrors++;
}
else
{
printf("receiver_thread: mq_receive interrupted!\n", i);
}
}
else if (nbytes != TEST_MSGLEN)
{
@ -336,8 +358,26 @@ void mqueue_test(void)
printf("mqueue_test: ERROR sender thread exited with %d errors\n", (int)result);
}
#ifndef CONFIG_DISABLE_SIGNALS
/* Wake up the receiver thread with a signal */
printf("mqueue_test: Killing receiver\n");
pthread_kill(receiver, 9);
#endif
/* Wait a bit to see if the thread exits on its own */
usleep(500*1000);
/* Then cancel the thread and see if it did */
printf("mqueue_test: Canceling receiver\n");
pthread_cancel(receiver);
status = pthread_cancel(receiver);
if (status == ESRCH)
{
printf("mqueue_test: receiver has already terminated\n");
}
pthread_join(receiver, &result);
if (result != (void*)0)
{

2
nuttx/sched/Makefile
View File

@ -71,7 +71,7 @@ SIGNAL_SRCS = sig_initialize.c \
sig_cleanup.c sig_received.c sig_deliver.c
MQUEUE_SRCS = mq_open.c mq_close.c mq_unlink.c mq_send.c mq_receive.c \
mq_setattr.c mq_getattr.c mq_initialize.c mq_descreate.c \
mq_findnamed.c mq_msgfree.c mq_msgqfree.c
mq_findnamed.c mq_msgfree.c mq_msgqfree.c mq_waitirq.c
ifneq ($(CONFIG_DISABLE_SIGNALS),y)
MQUEUE_SRCS += mq_notify.c
endif

6
nuttx/sched/mq_internal.h
View File

@ -181,7 +181,7 @@ extern "C" {
#define EXTERN extern
#endif
/* Functions defined in mq_initialized.c *******************/
/* Functions defined in mq_initialize.c ********************/
EXTERN void weak_function mq_initialize(void);
EXTERN void mq_desblockalloc(void);
@ -191,6 +191,10 @@ EXTERN FAR msgq_t *mq_findnamed(const char *mq_name);
EXTERN void mq_msgfree(FAR mqmsg_t *mqmsg);
EXTERN void mq_msgqfree(FAR msgq_t *msgq);
/* mq_waitirq.c ********************************************/
EXTERN void mq_waitirq(FAR _TCB *wtcb);
#undef EXTERN
#ifdef __cplusplus
}

202
nuttx/sched/mq_receive.c
View File

@ -43,6 +43,7 @@
#include <fcntl.h> /* O_NONBLOCK */
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <mqueue.h>
#include <sched.h>
#include <debug.h>
@ -106,8 +107,17 @@
* priority.
*
* Return Value:
* Length of the selected message in bytes, otherwise -1
* (ERROR).
* One success, the length of the selected message in bytes.is
* returned. On failure, -1 (ERROR) is returned and the errno
* is set appropriately:
*
* EAGAIN The queue was empty, and the O_NONBLOCK flag was set
* for the message queue description referred to by 'mqdes'.
* EPERM Message queue opened not opened for reading.
* EMSGSIZE 'msglen' was less than the maxmsgsize attribute of the
* message queue.
* EINTR The call was interrupted by a signal handler.
* EINVAL Invalid 'msg' or 'mqdes'
*
* Assumptions:
*
@ -125,110 +135,142 @@ int mq_receive(mqd_t mqdes, void *msg, size_t msglen, int *prio)
/* Verify the input parameters */
sched_lock();
if (msg && mqdes && (mqdes->oflags & O_RDOK) != 0 &&
msglen >= (size_t)mqdes->msgq->maxmsgsize)
if (!msg || !mqdes)
{
/* Get a pointer to the message queue */
*get_errno_ptr() = EINVAL;
return ERROR;
}
msgq = mqdes->msgq;
if ((mqdes->oflags & O_RDOK) == 0)
{
*get_errno_ptr() = EPERM;
return ERROR;
}
/* Several operations must be performed below: We must determine if
* a message is pending and, if not, wait for the message. Since
* messages can be sent from the interrupt level, there is a race
* condition that can only be eliminated by disabling interrupts!
if (msglen < (size_t)mqdes->msgq->maxmsgsize)
{
*get_errno_ptr() = EMSGSIZE;
return ERROR;
}
/* Get a pointer to the message queue */
sched_lock();
msgq = mqdes->msgq;
/* Several operations must be performed below: We must determine if
* a message is pending and, if not, wait for the message. Since
* messages can be sent from the interrupt level, there is a race
* condition that can only be eliminated by disabling interrupts!
*/
saved_state = irqsave();
/* Get the message from the head of the queue */
while ((curr = (FAR mqmsg_t*)sq_remfirst(&msgq->msglist)) == NULL)
{
/* Should we block until there the above condition has been
* satisfied?
*/
saved_state = irqsave();
/* Get the message from the head of the queue */
while ((curr = (FAR mqmsg_t*)sq_remfirst(&msgq->msglist)) == NULL)
if (!(mqdes->oflags & O_NONBLOCK))
{
/* Should we block until there the above condition has been
* satisfied?
/* Block and try again */
rtcb = (FAR _TCB*)g_readytorun.head;
rtcb->msgwaitq = msgq;
msgq->nwaitnotempty++;
*get_errno_ptr() = OK;
up_block_task(rtcb, TSTATE_WAIT_MQNOTEMPTY);
/* When we resume at this point, either (1) the message queue
* is no longer empty, or (2) the wait has been interrupted by
* a signal. We can detect the latter case be examining the
* errno value (should be EINTR).
*/
if (!(mqdes->oflags & O_NONBLOCK))
{
/* Block and try again */
rtcb = (FAR _TCB*)g_readytorun.head;
rtcb->msgwaitq = msgq;
msgq->nwaitnotempty++;
up_block_task(rtcb, TSTATE_WAIT_MQNOTEMPTY);
}
else
if (*get_errno_ptr() != OK)
{
break;
}
}
/* If we got message, then decrement the number of messages in
* the queue while we are still in the critical section
*/
if (curr)
else
{
msgq->nmsgs--;
/* The queue was empty, and the O_NONBLOCK flag was set for the
* message queue description referred to by 'mqdes'.
*/
*get_errno_ptr() = EAGAIN;
break;
}
irqrestore(saved_state);
}
/* Check (again) if we got a message from the message queue*/
/* If we got message, then decrement the number of messages in
* the queue while we are still in the critical section
*/
if (curr)
if (curr)
{
msgq->nmsgs--;
}
irqrestore(saved_state);
/* Check (again) if we got a message from the message queue*/
if (curr)
{
/* Get the length of the message (also the return value) */
ret = rcvmsglen = curr->msglen;
/* Copy the message into the caller's buffer */
memcpy(msg, (const void*)curr->mail, rcvmsglen);
/* Copy the message priority as well (if a buffer is provided) */
if (prio)
{
/* Get the length of the message (also the return value) */
*prio = curr->priority;
}
ret = rcvmsglen = curr->msglen;
/* We are done with the message. Deallocate it now. */
/* Copy the message into the caller's buffer */
mq_msgfree(curr);
memcpy(msg, (const void*)curr->mail, rcvmsglen);
/* Check if any tasks are waiting for the MQ not full event. */
/* Copy the message priority as well (if a buffer is provided) */
if (msgq->nwaitnotfull > 0)
{
/* Find the highest priority task that is waiting for
* this queue to be not-full in g_waitingformqnotfull list.
* This must be performed in a critical section because
* messages can be sent from interrupt handlers.
*/
if (prio)
saved_state = irqsave();
for (btcb = (FAR _TCB*)g_waitingformqnotfull.head;
btcb && btcb->msgwaitq != msgq;
btcb = btcb->flink);
/* If one was found, unblock it. NOTE: There is a race
* condition here: the queue might be full again by the
* time the task is unblocked
*/
if (!btcb)
{
*prio = curr->priority;
PANIC(OSERR_MQNOTFULLCOUNT);
}
/* We are done with the message. Deallocate it now. */
mq_msgfree(curr);
/* Check if any tasks are waiting for the MQ not full event. */
if (msgq->nwaitnotfull > 0)
else
{
/* Find the highest priority task that is waiting for
* this queue to be not-full in g_waitingformqnotfull list.
* This must be performed in a critical section because
* messages can be sent from interrupt handlers.
*/
saved_state = irqsave();
for (btcb = (FAR _TCB*)g_waitingformqnotfull.head;
btcb && btcb->msgwaitq != msgq;
btcb = btcb->flink);
/* If one was found, unblock it. NOTE: There is a race
* condition here: the queue might be full again by the
* time the task is unblocked
*/
if (!btcb)
{
PANIC(OSERR_MQNOTFULLCOUNT);
}
else
{
btcb->msgwaitq = NULL;
msgq->nwaitnotfull--;
up_unblock_task(btcb);
}
irqrestore(saved_state);
btcb->msgwaitq = NULL;
msgq->nwaitnotfull--;
up_unblock_task(btcb);
}
irqrestore(saved_state);
}
}

377
nuttx/sched/mq_send.c
View File

@ -43,6 +43,7 @@
#include <fcntl.h>
#include <mqueue.h>
#include <string.h>
#include <errno.h>
#include <sched.h>
#include <debug.h>
#include <nuttx/arch.h>
@ -197,7 +198,18 @@ FAR mqmsg_t *mq_msgalloc(void)
* prio - The priority of the message
*
* Return Value:
* None
* On success, mq_send() returns0 (OK); on error, -1 (ERROR)
* is returned, with errno set to indicate the error:
*
* EAGAIN The queue was empty, and the O_NONBLOCK flag was
* set for the message queue description referred to
* by mqdes.
* EINVAL Either msg or mqdes is NULL or the value of prio
* is invalid.
* EPERM Message queue opened not opened for writing.
* EMSGSIZE 'msglen' was greater than the maxmsgsize attribute
* of the message queue.
* EINTR The call was interrupted by a signal handler.
*
* Assumptions/restrictions:
*
@ -216,192 +228,225 @@ int mq_send(mqd_t mqdes, const void *msg, size_t msglen, int prio)
/* Verify the input parameters */
sched_lock();
if (msg && mqdes && (mqdes->oflags & O_WROK) != 0 &&
msglen > 0 && msglen <= (size_t)mqdes->msgq->maxmsgsize &&
prio >= 0 && prio <= MQ_PRIO_MAX)
if (!msg || !mqdes || prio < 0 || prio > MQ_PRIO_MAX)
{
/* Get a pointer to the message queue */
*get_errno_ptr() = EINVAL;
return ERROR;
}
msgq = mqdes->msgq;
if ((mqdes->oflags & O_WROK) == 0)
{
*get_errno_ptr() = EPERM;
return ERROR;
}
/* If we are sending a message from an interrupt handler, then
* try to get message structure unconditionally.
if (msglen < 0 || msglen > (size_t)mqdes->msgq->maxmsgsize)
{
*get_errno_ptr() = EMSGSIZE;
return ERROR;
}
/* Get a pointer to the message queue */
sched_lock();
msgq = mqdes->msgq;
/* If we are sending a message from an interrupt handler, then
* try to get message structure unconditionally.
*/
saved_state = irqsave();
if (up_interrupt_context())
{
curr = mq_msgalloc();
}
/* Otherwise, arbitrarily limit the number of messages in the
* queue to the value determined when the message queue was opened.
* This makes us more POSIX-like as well as prohibits one slow
* responding task from consuming all available memory.
*/
else if (msgq->nmsgs >= msgq->maxmsgs)
{
/* Should we block until there is sufficient space in the
* message queue?
*/
saved_state = irqsave();
if (up_interrupt_context())
if ((mqdes->oflags & O_NONBLOCK) != 0)
{
curr = mq_msgalloc();
/* No... We will return an error to the caller. */
*get_errno_ptr() = EAGAIN;
curr = NULL;
}
/* Otherwise, arbitrarily limit the number of messages in the
* queue to the value determined when the message queue was opened.
* This makes us more POSIX-like as well as prohibits one slow
* responding task from consuming all available memory.
*/
else if (msgq->nmsgs >= msgq->maxmsgs)
{
/* Should we block until there is sufficient space in the
* message queue?
*/
if ((mqdes->oflags & O_NONBLOCK) != 0)
{
/* No... We will return an error to the caller. */
curr = NULL;
}
/* Yes... We will not return control until the message queue is
* available.
*/
else
{
/* Loop until there are fewer than max allowable messages in the
* receiving message queue
*/
while (msgq->nmsgs >= msgq->maxmsgs)
{
/* Block until the message queue is no longer full.
* When we are unblocked, we will try again
*/
rtcb = (FAR _TCB*)g_readytorun.head;
rtcb->msgwaitq = msgq;
(msgq->nwaitnotfull)++;
up_block_task(rtcb, TSTATE_WAIT_MQNOTFULL);
}
/* It should be okay to get add a message to the receiving
* message queue now.
*/
curr = mq_msgalloc();
}
}
/* We are not in an interrupt handler and the receiving message queue
* is not full
/* Yes... We will not return control until the message queue is
* available.
*/
else
{
/* Just allocate a message */
boolean interrupted = FALSE;
curr = mq_msgalloc();
}
irqrestore(saved_state);
/* Check if we were able to get a message structure */
if (curr)
{
/* Construct the current message header info */
curr->priority = (ubyte)prio;
curr->msglen = (ubyte)msglen;
/* Copy the message data into the message */
memcpy((void*)curr->mail, (const void*)msg, msglen);
/* Insert the new message in the message queue */
saved_state = irqsave();
/* Search the message list to find the location to insert the new
* message. Each is list is maintained in ascending priority order.
/* Loop until there are fewer than max allowable messages in the
* receiving message queue
*/
for (prev = NULL, next = (FAR mqmsg_t*)msgq->msglist.head;
next && prio <= next->priority;
prev = next, next = next->next);
/* Add the message at the right place */
if (prev)
while (msgq->nmsgs >= msgq->maxmsgs)
{
sq_addafter((FAR sq_entry_t*)prev, (FAR sq_entry_t*)curr,
&msgq->msglist);
/* Block until the message queue is no longer full.
* When we are unblocked, we will try again
*/
rtcb = (FAR _TCB*)g_readytorun.head;
rtcb->msgwaitq = msgq;
(msgq->nwaitnotfull)++;
*get_errno_ptr() = OK;
up_block_task(rtcb, TSTATE_WAIT_MQNOTFULL);
/* When we resume at this point, either (1) the message queue
* is no longer empty, or (2) the wait has been interrupted by
* a signal. We can detect the latter case be examining the
* errno value (should be EINTR).
*/
if (*get_errno_ptr() != OK)
{
interrupted = TRUE;
break;
}
}
/* If we were not interrupted, then it should be okay to add
* a message to the receiving message queue now.
*/
if (!interrupted)
{
curr = mq_msgalloc();
}
}
}
/* We are not in an interrupt handler and the receiving message queue
* is not full
*/
else
{
/* Just allocate a message */
curr = mq_msgalloc();
}
irqrestore(saved_state);
/* Check if we were able to get a message structure */
if (curr)
{
/* Construct the current message header info */
curr->priority = (ubyte)prio;
curr->msglen = (ubyte)msglen;
/* Copy the message data into the message */
memcpy((void*)curr->mail, (const void*)msg, msglen);
/* Insert the new message in the message queue */
saved_state = irqsave();
/* Search the message list to find the location to insert the new
* message. Each is list is maintained in ascending priority order.
*/
for (prev = NULL, next = (FAR mqmsg_t*)msgq->msglist.head;
next && prio <= next->priority;
prev = next, next = next->next);
/* Add the message at the right place */
if (prev)
{
sq_addafter((FAR sq_entry_t*)prev, (FAR sq_entry_t*)curr,
&msgq->msglist);
}
else
{
sq_addfirst((FAR sq_entry_t*)curr, &msgq->msglist);
}
/* Increment the count of message in the queue */
msgq->nmsgs++;
irqrestore(saved_state);
/* Check if we need to notify any tasks that are attached to the
* message queue
*/
#ifndef CONFIG_DISABLE_SIGNALS
if (msgq->ntmqdes)
{
/* Remove the message notification data from the message queue. */
#ifdef CONFIG_CAN_PASS_STRUCTS
union sigval value = msgq->ntvalue;
#else
void *sival_ptr = msgq->ntvalue.sival_ptr;
#endif
int signo = msgq->ntsigno;
int pid = msgq->ntpid;
/* Detach the notification */
msgq->ntpid = INVALID_PROCESS_ID;
msgq->ntsigno = 0;
msgq->ntvalue.sival_int = 0;
msgq->ntmqdes = NULL;
/* Queue the signal -- What if this returns an error? */
#ifdef CONFIG_CAN_PASS_STRUCTS
sig_mqnotempty(pid, signo, value);
#else
sig_mqnotempty(pid, signo, sival_ptr);
#endif
}
#endif
/* Check if any tasks are waiting for the MQ not empty event. */
saved_state = irqsave();
if (msgq->nwaitnotempty > 0)
{
/* Find the highest priority task that is waiting for
* this queue to be non-empty in g_waitingformqnotempty
* list. sched_lock() should give us sufficent protection since
* interrupts should never cause a change in this list
*/
for (btcb = (FAR _TCB*)g_waitingformqnotempty.head;
btcb && btcb->msgwaitq != msgq;
btcb = btcb->flink);
/* If one was found, unblock it */
if (!btcb)
{
PANIC(OSERR_MQNONEMPTYCOUNT);
}
else
{
sq_addfirst((FAR sq_entry_t*)curr, &msgq->msglist);
btcb->msgwaitq = NULL;
msgq->nwaitnotempty--;
up_unblock_task(btcb);
}
/* Increment the count of message in the queue */
msgq->nmsgs++;
irqrestore(saved_state);
/* Check if we need to notify any tasks that are attached to the
* message queue
*/
#ifndef CONFIG_DISABLE_SIGNALS
if (msgq->ntmqdes)
{
/* Remove the message notification data from the message queue. */
#ifdef CONFIG_CAN_PASS_STRUCTS
union sigval value = msgq->ntvalue;
#else
void *sival_ptr = msgq->ntvalue.sival_ptr;
#endif
int signo = msgq->ntsigno;
int pid = msgq->ntpid;
/* Detach the notification */
msgq->ntpid = INVALID_PROCESS_ID;
msgq->ntsigno = 0;
msgq->ntvalue.sival_int = 0;
msgq->ntmqdes = NULL;
/* Queue the signal -- What if this returns an error? */
#ifdef CONFIG_CAN_PASS_STRUCTS
sig_mqnotempty(pid, signo, value);
#else
sig_mqnotempty(pid, signo, sival_ptr);
#endif
}
#endif
/* Check if any tasks are waiting for the MQ not empty event. */
saved_state = irqsave();
if (msgq->nwaitnotempty > 0)
{
/* Find the highest priority task that is waiting for
* this queue to be non-empty in g_waitingformqnotempty
* list. sched_lock() should give us sufficent protection since
* interrupts should never cause a change in this list
*/
for (btcb = (FAR _TCB*)g_waitingformqnotempty.head;
btcb && btcb->msgwaitq != msgq;
btcb = btcb->flink);
/* If one was found, unblock it */
if (!btcb)
{
PANIC(OSERR_MQNONEMPTYCOUNT);
}
else
{
btcb->msgwaitq = NULL;
msgq->nwaitnotempty--;
up_unblock_task(btcb);
}
}
irqrestore(saved_state);
ret = OK;
}
irqrestore(saved_state);
ret = OK;
}
sched_unlock();

125
nuttx/sched/mq_waitirq.c Normal file
View File

@ -0,0 +1,125 @@
/************************************************************
* mq_waitirq.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 <errno.h>
#include <nuttx/arch.h>
#include "sem_internal.h"
/************************************************************
* Compilation Switches
************************************************************/
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Type Declarations
************************************************************/
/************************************************************
* Global Variables
************************************************************/
/************************************************************
* Private Variables
************************************************************/
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Public Functions
************************************************************/
/************************************************************
* Function: sem_waitirq
*
* Description:
* This function is called when a signal is received by a
* task that is waiting on a message queue -- either for a
* queue to becoming not full (on mq_send) or not empty
* (on mq_receive).
*
* Parameters:
* wtcb - A pointer to the TCB of the task that is waiting
* on a message queue, but has received a signal instead.
*
* Return Value:
* None
*
* Assumptions:
*
************************************************************/
void mq_waitirq(FAR _TCB *wtcb)
{
irqstate_t saved_state;
/* Disable interrupts. This is necessary because an
* interrupt handler may attempt to send a message while we are
* doing this.
*/
saved_state = irqsave();
/* It is possible that an interrupt/context switch beat us to the
* punch and already changed the task's state.
*/
if (wtcb->task_state == TSTATE_WAIT_MQNOTEMPTY ||
wtcb->task_state == TSTATE_WAIT_MQNOTFULL)
{
/* Mark the errno value for the thread. */
wtcb->errno = EINTR;
/* Restart the the task. */
up_unblock_task(wtcb);
}
/* Interrupts may now be enabled. */
irqrestore(saved_state);
}

4
nuttx/sched/sem_wait.c
View File

@ -156,11 +156,13 @@ int sem_wait(sem_t *sem)
/* Add the TCB to the prioritized semaphore wait queue */
*get_errno_ptr() = 0;
up_block_task(rtcb, TSTATE_WAIT_SEM);
/* When we resume at this point, either (1) the semaphore has been
* assigned to this thread of execution, or (2) the semaphore wait
* has been interrupted by a signal.
* has been interrupted by a signal. We can detect the latter case
* be examining the errno value.
*/
if (*get_errno_ptr() != EINTR)

9
nuttx/sched/sig_received.c
View File

@ -47,6 +47,7 @@
#include "os_internal.h"
#include "sem_internal.h"
#include "sig_internal.h"
#include "mq_internal.h"
/************************************************************
* Definitions
@ -380,7 +381,13 @@ int sig_received(FAR _TCB *stcb, siginfo_t *info)
* task must be unblocked when a signal is received.
*/
/* NOT YET IMPLEMENTED. */
#ifndef CONFIG_DISABLE_MQUEUE
if (stcb->task_state == TSTATE_WAIT_MQNOTEMPTY ||
stcb->task_state == TSTATE_WAIT_MQNOTFULL)
{
mq_waitirq(stcb);
}
#endif
}
return ret;