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atexit() and on_exit() may now be configured to support multiple exit callbacks

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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4995 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo
2012-08-01 17:47:54 +00:00
parent 8a4cf655d7
commit 20324504d5
13 changed files with 617 additions and 120 deletions
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nuttx/sched/task_exithook.c
+153 -50
View File
@@ -73,6 +73,153 @@
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: task_atexit
*
* Description:
* Call any registerd atexit function(s)
*
****************************************************************************/
#ifdef CONFIG_SCHED_ATEXIT
static inline void task_atexit(FAR _TCB *tcb)
{
#if defined(CONFIG_SCHED_ATEXIT_MAX) && CONFIG_SCHED_ATEXIT_MAX > 1
int index;
/* Call each atexit function in reverse order of registration atexit()
* functions are registered from lower to higher arry indices; they must
* be called in the reverse order of registration when task exists, i.e.,
* from higher to lower indices.
*/
for (index = CONFIG_SCHED_ATEXIT_MAX-1; index >= 0; index--)
{
if (tcb->atexitfunc[index])
{
/* Call the atexit function */
(*tcb->atexitfunc[index])();
/* Nullify the atexit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the atext function
* pointer will assure that the callback is performed only once.
*/
tcb->atexitfunc[index] = NULL;
}
}
#else
if (tcb->atexitfunc)
{
/* Call the atexit function */
(*tcb->atexitfunc)();
/* Nullify the atexit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the atext function
* pointer will assure that the callback is performed only once.
*/
tcb->atexitfunc = NULL;
}
#endif
#else
# define task_atexit(tcb)
#endif
/****************************************************************************
* Name: task_onexit
*
* Description:
* Call any registerd on)exit function(s)
*
****************************************************************************/
#ifdef CONFIG_SCHED_ONEXIT
static inline void task_onexit(FAR _TCB *tcb, int status)
{
#if defined(CONFIG_SCHED_ONEXIT_MAX) && CONFIG_SCHED_ONEXIT_MAX > 1
int index;
/* Call each on_exit function in reverse order of registration. on_exit()
* functions are registered from lower to higher arry indices; they must
* be called in the reverse order of registration when task exists, i.e.,
* from higher to lower indices.
*/
for (index = CONFIG_SCHED_ONEXIT_MAX-1; index >= 0; index--)
{
if (tcb->onexitfunc[index])
{
/* Call the on_exit function */
(*tcb->onexitfunc[index])(status, tcb->onexitarg[index]);
/* Nullify the on_exit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the atext function
* pointer will assure that the callback is performed only once.
*/
tcb->onexitfunc[index] = NULL;
}
}
#else
if (tcb->onexitfunc)
{
/* Call the on_exit function */
(*tcb->onexitfunc)(status, tcb->onexitarg);
/* Nullify the on_exit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the on_exit function
* pointer will assure that the callback is performed only once.
*/
tcb->onexitfunc = NULL;
}
#endif
#else
# define task_onexit(tcb,status)
#endif
/****************************************************************************
* Name: task_exitwakeup
*
* Description:
* Wakeup any tasks waiting for this task to exit
*
****************************************************************************/
#ifdef CONFIG_SCHED_WAITPID
static inline void task_exitwakeup(FAR _TCB *tcb, int status)
{
/* Wakeup any tasks waiting for this task to exit */
while (tcb->exitsem.semcount < 0)
{
/* "If more than one thread is suspended in waitpid() awaiting
* termination of the same process, exactly one thread will return
* the process status at the time of the target process termination."
* Hmmm.. what do we return to the others?
*/
if (tcb->stat_loc)
{
*tcb->stat_loc = status << 8;
tcb->stat_loc = NULL;
}
/* Wake up the thread */
sem_post(&tcb->exitsem);
}
}
#else
# define task_exitwakeup(tcb, status)
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
@@ -102,65 +249,21 @@
void task_exithook(FAR _TCB *tcb, int status)
{
/* If an exit function was registered, call it now before we do any un-
* initialized. NOTE: In the case of task_delete(), the exit function
/* If exit function(s) were registered, call them now before we do any un-
* initialization. NOTE: In the case of task_delete(), the exit function
* will *not* be called on the thread execution of the task being deleted!
*/
#ifdef CONFIG_SCHED_ATEXIT
if (tcb->atexitfunc)
{
/* Call the atexit function */
task_atexit(tcb);
(*tcb->atexitfunc)();
/* Call any registered on_exit function(s) */
/* Nullify the atexit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the atext function
* pointer will assure that the callback is performed only once.
*/
tcb->atexitfunc = NULL;
}
#endif
#ifdef CONFIG_SCHED_ONEXIT
if (tcb->onexitfunc)
{
/* Call the on_exit function */
(*tcb->onexitfunc)(status, tcb->onexitarg);
/* Nullify the on_exit function. task_exithook may be called more then
* once in most task exit scenarios. Nullifying the on_exit function
* pointer will assure that the callback is performed only once.
*/
tcb->onexitfunc = NULL;
}
#endif
task_onexit(tcb, status);
/* Wakeup any tasks waiting for this task to exit */
#ifdef CONFIG_SCHED_WAITPID /* Experimental */
while (tcb->exitsem.semcount < 0)
{
/* "If more than one thread is suspended in waitpid() awaiting
* termination of the same process, exactly one thread will return
* the process status at the time of the target process termination."
* Hmmm.. what do we return to the others?
*/
task_exitwakeup(tcb, status);
if (tcb->stat_loc)
{
*tcb->stat_loc = status << 8;
tcb->stat_loc = NULL;
}
/* Wake up the thread */
sem_post(&tcb->exitsem);
}
#endif
/* Flush all streams (File descriptors will be closed when
* the TCB is deallocated).
*/