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Task list is introduced to the thread library.

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In order to do resource recycling we need a table structure. In the search of
one, we concluded that a task list will make things easier when we start adding
COPY and NEW space handling.

This commit is for utcb recycling. Now, it does not support thread trees more
than one level depth. Thus, to be able to test it, we preferred l4thread_destroy
instead of l4thread_exit.
This commit is contained in:
Bora Sahin
2009-11-10 14:46:54 +02:00
parent 8f55e72f00
commit a23b7fcbc2
6 changed files with 211 additions and 38 deletions
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95
conts/libl4thread/src/utcb.c
View File

@@ -8,43 +8,86 @@
#include <l4lib/exregs.h>
#include <errno.h>
#include <malloc/malloc.h>
#include <idpool.h>
#include <utcb-common.h>
#include <utcb.h>
/* Static variable definitions */
static unsigned long lib_utcb_end_addr;
/* Extern declarations */
extern struct l4t_global_list l4t_global_tasks;
/* Function definitions */
unsigned long get_utcb_addr(void)
unsigned long get_utcb_addr(struct l4t_tcb *task)
{
unsigned long utcb_addr;
struct utcb_desc *udesc;
unsigned long slot;
if (!(utcb_addr = utcb_new_slot(udesc_ptr))) {
udesc_ptr = utcb_new_desc();
utcb_addr = utcb_new_slot(udesc_ptr);
/* Setting this up twice is a bug. */
BUG_ON(task->utcb_addr);
/* Search for an empty utcb slot already allocated to this space. */
list_foreach_struct(udesc, &task->utcb_head->list, list)
if ((slot = utcb_new_slot(udesc)))
goto found;
/* Allocate a new utcb memory region and return its base. */
udesc = utcb_new_desc();
slot = utcb_new_slot(udesc);
list_insert(&udesc->list, &task->utcb_head->list);
found:
task->utcb_addr = slot;
return slot;
}
int delete_utcb_addr(struct l4t_tcb *task)
{
struct utcb_desc *udesc;
list_foreach_struct(udesc, &task->utcb_head->list, list) {
/* FIXME: Use variable alignment than a page */
/* Detect matching slot */
if (page_align(task->utcb_addr) == udesc->utcb_base) {
/* Delete slot from the descriptor */
utcb_delete_slot(udesc, task->utcb_addr);
/* Is the desc completely empty now? */
if (id_is_empty(udesc->slots)) {
/* Unlink desc from its list */
list_remove_init(&udesc->list);
/* Delete the descriptor */
utcb_delete_desc(udesc);
}
return 0; /* Finished */
}
}
if (utcb_addr >= lib_utcb_end_addr)
return 0;
return utcb_addr;
BUG();
}
static int set_utcb_addr(void)
{
struct exregs_data exregs;
unsigned long utcb_addr;
struct task_ids ids;
struct l4t_tcb *task;
struct utcb_desc *udesc;
int err;
l4_getid(&ids);
// FIXME: its tid must be 0.
udesc_ptr = utcb_new_desc();
utcb_addr = get_utcb_addr();
/* Create a task. */
if (IS_ERR(task = l4t_tcb_alloc_init(0, 0)))
return -ENOMEM;
/* Add child to the global task list. */
list_insert_tail(&task->list, &l4t_global_tasks.list);
l4t_global_tasks.total++;
udesc = utcb_new_desc();
task->utcb_addr = utcb_new_slot(udesc);
list_insert(&udesc->list, &task->utcb_head->list);
memset(&exregs, 0, sizeof(exregs));
exregs_set_utcb(&exregs, (unsigned long)utcb_addr);
exregs_set_utcb(&exregs, (unsigned long)task->utcb_addr);
l4_getid(&ids);
if ((err = l4_exchange_registers(&exregs, ids.tid)) < 0) {
printf("libl4thread: l4_exchange_registers failed with "
"(%d).\n", err);
@@ -59,11 +102,12 @@ int set_utcb_params(unsigned long utcb_start, unsigned long utcb_end)
int err;
/* Ensure that arguments are valid. */
if (IS_UTCB_SETUP()) {
printf("libl4thread: You have already called: %s.\n",
__FUNCTION__);
return -EPERM;
}
// FIXME: Check if set_utcb_params is called
/*if (IS_UTCB_SETUP()) {*/
/*printf("libl4thread: You have already called: %s.\n",*/
/*__FUNCTION__);*/
/*return -EPERM;*/
/*}*/
if (!utcb_start || !utcb_end) {
printf("libl4thread: Utcb address range cannot contain "
"0x0 as a start and/or end address(es).\n");
@@ -96,14 +140,9 @@ int set_utcb_params(unsigned long utcb_start, unsigned long utcb_end)
/* Init utcb virtual address pool */
utcb_pool_init(utcb_start, utcb_end);
lib_utcb_end_addr = utcb_end;
/* The very first thread's utcb address is assigned. */
if ((err = set_utcb_addr()) < 0)
return err;
return 0;
}
/*void destroy_utcb(void) {}*/