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Towards adding sys_clone()

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Stopped working on self_spawn() - going to finish clone() syscall first.
Arch-specific clone() library call that does ipc() and cloned child setup.
- Need to finish thread_create() that satisfy clone() necessities. i.e. setting up its stack.
  Question: Does the pager (and thus the microkernel) have to explicitly set SP_USR?
  Once the call is known to be successful, the library could set it.
This commit is contained in:
Bahadir Balban
2008-09-11 16:56:41 +03:00
parent fc51512438
commit af03975dc1
6 changed files with 230 additions and 35 deletions
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73
src/api/thread.c
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@@ -128,6 +128,47 @@ int arch_setup_new_thread(struct ktcb *new, struct ktcb *orig)
return 0;
}
int thread_setup_new_ids(struct task_ids *ids, unsigned int flags,
struct tcb *new, struct tcb *orig)
{
/* For tid, allocate requested id if it's available, else a new one */
if ((ids->tid = id_get(thread_id_pool, ids->tid)) < 0)
ids->tid = id_new(thread_id_pool);
/*
* If thread space is new or copied,
* allocate a new space id and tgid
*/
if (flags == THREAD_CREATE_NEWSPC ||
flags == THREAD_CREATE_COPYSPC) {
/*
* Allocate requested id if
* it's available, else a new one
*/
if ((ids->spid = id_get(space_id_pool,
ids->spid)) < 0)
ids->spid = id_new(space_id_pool);
/* It also gets a thread group id */
if ((ids->tgid = id_get(tgroup_id_pool,
ids->tgid)) < 0)
ids->tgid = id_new(tgroup_id_pool);
}
/* If thread space is the same, tgid is either new or existing one */
if (flags == THREAD_CREATE_SAMESPC) {
/* Check if same tgid is expected */
if (ids->tgid != task->tgid) {
if ((ids->tgid = id_get(tgroup_id_pool,
ids->tgid)) < 0)
ids->tgid = id_new(tgroup_id_pool);
}
}
/* Set all ids */
set_task_ids(new, ids);
}
/*
* Creates a thread, with a new thread id, and depending on the flags,
* either creates a new space, uses the same space as another thread,
@@ -137,7 +178,7 @@ int arch_setup_new_thread(struct ktcb *new, struct ktcb *orig)
*/
int thread_create(struct task_ids *ids, unsigned int flags)
{
struct ktcb *task, *new = (struct ktcb *)zalloc_page();
struct ktcb *task = 0, *new = (struct ktcb *)zalloc_page();
flags &= THREAD_FLAGS_MASK;
if (flags == THREAD_CREATE_NEWSPC) {
@@ -161,30 +202,8 @@ int thread_create(struct task_ids *ids, unsigned int flags)
BUG();
}
out:
/* Allocate requested id if it's available, else a new one */
if ((ids->tid = id_get(thread_id_pool, ids->tid)) < 0)
ids->tid = id_new(thread_id_pool);
/* If thread space is new or copied, it gets a new space id */
if (flags == THREAD_CREATE_NEWSPC ||
flags == THREAD_CREATE_COPYSPC) {
/*
* Allocate requested id if
* it's available, else a new one
*/
if ((ids->spid = id_get(space_id_pool,
ids->spid)) < 0)
ids->spid = id_new(space_id_pool);
/* It also gets a thread group id */
if ((ids->tgid = id_get(tgroup_id_pool,
ids->tgid)) < 0)
ids->tgid = id_new(tgroup_id_pool);
}
/* Set all ids */
set_task_ids(new, ids);
/* Set up new thread's tid, spid, tgid according to flags */
thread_setup_new_ids(ids, flags, new, task);
/* Set task state. */
new->state = TASK_INACTIVE;
@@ -198,7 +217,8 @@ out:
* system call return environment so that it can safely
* return as a copy of its original thread.
*/
if (flags == THREAD_CREATE_COPYSPC)
if (flags == THREAD_CREATE_COPYSPC ||
flags == THREAD_CREATE_SAMESPC)
arch_setup_new_thread(new, task);
/* Add task to global hlist of tasks */
@@ -231,6 +251,7 @@ int sys_thread_control(syscall_context_t *regs)
case THREAD_RESUME:
ret = thread_resume(ids);
break;
/* TODO: THREAD_DESTROY! */
default:
ret = -EINVAL;
}