46 |
|
|
47 |
new_task = kmem_cache_alloc (task_cache); |
new_task = kmem_cache_alloc (task_cache); |
48 |
assert (new_task); |
assert (new_task); |
49 |
|
new_task->ref_cnt = 1; |
|
/* One reference for just being alive; one for the caller. */ |
|
|
|
|
|
new_task->ref_cnt = 2; |
|
50 |
|
|
51 |
/* Create memory map for task. */ |
/* Create memory map for task. */ |
|
|
|
52 |
if (inherit_memory_p) |
if (inherit_memory_p) |
53 |
new_task->map = vm_map_fork (parent_task->map); |
new_task->map = vm_map_fork (parent_task->map); |
54 |
else |
else |
75 |
return KERN_SUCCESS; |
return KERN_SUCCESS; |
76 |
} |
} |
77 |
|
|
78 |
/* Terminate TASK and release all resources held by it. */ |
/* Obtain reference to TASK. */ |
79 |
|
void |
80 |
|
task_reference (struct task *task) |
81 |
|
{ |
82 |
|
task->ref_cnt++; |
83 |
|
} |
84 |
|
|
85 |
|
/* Deallocate a reference to TASK. If reference counter drops to |
86 |
|
zero we release all resources held by task. */ |
87 |
|
void |
88 |
|
task_deallocate (struct task *task) |
89 |
|
{ |
90 |
|
if (--task->ref_cnt != 0) |
91 |
|
return; |
92 |
|
|
93 |
|
trace_printf ("implement task_deallocate"); |
94 |
|
} |
95 |
|
|
96 |
|
/* Terminate TASK and release all resources held by it. |
97 |
|
We loop through all threads in the task and terminate them. |
98 |
|
(special case for current thread). When they are deallocated |
99 |
|
by the reaper thread, they will release their refernece to the |
100 |
|
task. When all threads are deallocated, so are the task. */ |
101 |
kern_return_t |
kern_return_t |
102 |
task_terminate (struct task *task) |
task_terminate (struct task *task) |
103 |
{ |
{ |
104 |
panic ("task panic"); |
struct thread *self = THREAD_CURRENT (), *thread; |
105 |
|
int zombify_p = 0; |
106 |
|
|
107 |
|
queue_iterate (& task->thread_list, thread, struct thread *, taskq) |
108 |
|
{ |
109 |
|
if (thread != self) |
110 |
|
thread_terminate (thread); |
111 |
|
else |
112 |
|
zombify_p = 1; |
113 |
|
} |
114 |
|
|
115 |
|
/* Release our reference to the task. */ |
116 |
|
task_deallocate (task); |
117 |
|
|
118 |
|
if (zombify_p) |
119 |
|
thread_terminate (self); |
120 |
|
return 0; |
121 |
} |
} |
122 |
|
|
123 |
void |
void |
124 |
task_init (void) |
task_init (void) |
125 |
{ |
{ |
|
kern_return_t err; |
|
|
|
|
126 |
task_cache = kmem_cache_create ("task cache", sizeof (struct task), 0); |
task_cache = kmem_cache_create ("task cache", sizeof (struct task), 0); |
127 |
assert (task_cache); |
assert (task_cache); |
128 |
|
|
129 |
/* We create the kernel task - and replace the memory map with VM_MAP_KERNEL. */ |
/* We can not use ``task_create'' to allocate our kernel task |
130 |
|
-- since it uses TASK_KERNEL(). We have to do it manually. */ |
131 |
|
|
132 |
err = task_create (0, 0, &task_kernel); |
task_kernel = kmem_cache_alloc (task_cache); |
133 |
assert (err == KERN_SUCCESS); |
memset (task_kernel, 0, sizeof (struct task)); |
134 |
|
|
|
/* ??? deallocate previous map. */ |
|
135 |
task_kernel->map = VM_MAP_KERNEL (); |
task_kernel->map = VM_MAP_KERNEL (); |
136 |
|
task_kernel->ref_cnt = 2; |
137 |
|
queue_init (&task_kernel->thread_list); |
138 |
|
task_kernel->ipc_object = ipc_object_create (); |
139 |
} |
} |
140 |
|
|
141 |
/* Task for returning name of send right to task in tasks IPC object. */ |
/* Task for returning name of send right to task in tasks IPC object. */ |