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/*
* cleanup.c
*
* Description:
* This translation unit implements routines associated cleaning up
* threads.
*/
#include <errno.h>
#include <malloc.h>
#include "pthread.h"
#include "implement.h"
int
_pthread_handler_push(int stack,
int poporder,
void (*routine)(void *),
void *arg)
{
/* Place the new handler into the list so that handlers are
popped off in the order given by poporder. */
_pthread_handler_node_t * new_handler;
_pthread_handler_node_t * next;
_pthread_handler_node_t ** stacktop;
stacktop = _PTHREAD_STACK(stack);
new_handler =
(_pthread_handler_node_t *) malloc(sizeof(_pthread_handler_node_t));
if (new_handler == NULL)
{
return 0; /* NOMEM */
}
new_handler->routine = routine;
new_handler->arg = arg;
if (poporder == _PTHREAD_HANDLER_POP_LIFO)
{
/* Add the new node to the start of the list. */
new_handler->next = *stacktop;
*stacktop = new_handler;
}
else
{
/* Add the new node to the end of the list. */
new_handler->next = NULL;
if (*stacktop == NULL)
{
*stacktop = new_handler;
}
else
{
next = *stacktop;
while (next->next != NULL)
{
next = next->next;
}
next->next = new_handler;
}
}
return 0;
}
void
_pthread_handler_pop(int stack, int execute)
{
_pthread_handler_node_t ** stacktop;
_pthread_handler_node_t * next;
void (* func)(void *);
void * arg;
stacktop = _PTHREAD_STACK(stack);
if (*stacktop != NULL)
{
func = (*stacktop)->routine;
arg = (*stacktop)->arg;
next = (*stacktop)->next;
free(*stacktop);
*stacktop = next;
if (execute != 0 && func != NULL)
{
(void) func(arg);
}
}
}
void
_pthread_handler_pop_all(int stack, int execute)
{
/* Pop and possibly run all handlers on the given stack. */
_pthread_handler_node_t ** stacktop;
_pthread_handler_node_t * next;
void (* func)(void *);
void * arg;
stacktop = _PTHREAD_STACK(stack);
while (*stacktop != NULL)
{
func = (*stacktop)->routine;
arg = (*stacktop)->arg;
next = (*stacktop)->next;
free(*stacktop);
*stacktop = next;
if (execute != 0 && func != NULL)
{
(void) func(arg);
}
}
}
/* Run destructors for all non-NULL key values for the calling thread.
*/
void
_pthread_destructor_run_all()
{
_pthread_tsd_key_t * key;
int count;
int dirty;
/* This threads private keys */
key = _pthread_tsd_key_table;
/* Stop destructor execution at a finite time. POSIX allows us
to ignore this if we like, even at the risk of an infinite loop.
FIXME: We don't know when to stop yet.
*/
for (count = 0; count < PTHREAD_DESTRUCTOR_ITERATIONS; count++)
{
int k;
void * arg;
dirty = 0;
/* Loop through all keys. */
for (k = 0; k < _POSIX_THREAD_KEYS_MAX; k++)
{
/* CRITICAL SECTION */
pthread_mutex_lock(&_pthread_tsd_mutex);
switch (key->status)
{
case _PTHREAD_TSD_KEY_INUSE:
arg = pthread_getspecific((pthread_key_t) k);
if (arg != NULL && key->destructor != NULL)
{
/* The destructor must be called with the mutex off. */
pthread_mutex_unlock(&_pthread_tsd_mutex);
/* END CRITICAL SECTION */
/* FIXME: Is the destructor supposed to set the key value
to NULL? How is this done when arg is the key value, not
a pointer to it? For now we assume that the destructor
always succeeds.
*/
(void) (key->destructor)(arg);
/* CRITICAL SECTION */
pthread_mutex_lock(&_pthread_tsd_mutex);
pthread_setspecific((pthread_key_t) k, NULL);
#if 0
/* Only needed if we don't assume the destructor
always succeeds.
*/
dirty = 1;
#endif
}
break;
case _PTHREAD_TSD_KEY_DELETED:
key->status = _PTHREAD_TSD_KEY_INUSE;
pthread_setspecific((pthread_key_t) k, NULL);
if (key->in_use <= 0)
{
/* This is the last thread to use this
deleted key. It can now be made available
for re-use.
*/
key->status = _PTHREAD_TSD_KEY_REUSE;
}
else
{
key->status = _PTHREAD_TSD_KEY_DELETED;
}
break;
default:
break;
}
pthread_mutex_unlock(&_pthread_tsd_mutex);
/* END CRITICAL SECTION */
key++;
}
if (!dirty)
break;
}
}
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