20 static SLIST_HEAD(, stack) def_stacks = SLIST_HEAD_INITIALIZER(head);
23 struct stack *
26 	struct stack *stack;  in _rthread_alloc_stack()  local
38 		stack = SLIST_FIRST(&def_stacks);  in _rthread_alloc_stack()
39 		if (stack != NULL) {  in _rthread_alloc_stack()
42 			return (stack);  in _rthread_alloc_stack()
48 	stack = malloc(sizeof(*stack));  in _rthread_alloc_stack()
49 	if (stack == NULL)  in _rthread_alloc_stack()
63 		stack->base = base = thread->attr.stack_addr;  in _rthread_alloc_stack()
64 		stack->len  = thread->attr.stack_size;  in _rthread_alloc_stack()
66 		stack->sp = base + rnd;  in _rthread_alloc_stack()
68 		stack->sp = base + thread->attr.stack_size - (_STACKALIGNBYTES+1) - rnd;  in _rthread_alloc_stack()
75 		stack->guardsize = 1;  in _rthread_alloc_stack()
76 		return (stack);  in _rthread_alloc_stack()
87 		free(stack);  in _rthread_alloc_stack()
97 		free(stack);  in _rthread_alloc_stack()
103 	stack->sp = base + rnd;  in _rthread_alloc_stack()
106 	stack->sp = base + size - (_STACKALIGNBYTES+1) - rnd;  in _rthread_alloc_stack()
112 		free(stack);  in _rthread_alloc_stack()
116 	stack->base = base;  in _rthread_alloc_stack()
117 	stack->guardsize = guardsize;  in _rthread_alloc_stack()
118 	stack->len = size;  in _rthread_alloc_stack()
119 	return (stack);  in _rthread_alloc_stack()
123 _rthread_free_stack(struct stack *stack)  in _rthread_free_stack()  argument
125 	if (stack->len == RTHREAD_STACK_SIZE_DEF + stack->guardsize &&  in _rthread_free_stack()
126 	    stack->guardsize == _thread_pagesize) {  in _rthread_free_stack()
128 		SLIST_INSERT_HEAD(&def_stacks, stack, link);  in _rthread_free_stack()
132 		if (stack->guardsize != 1)  in _rthread_free_stack()
133 			munmap(stack->base, stack->len);  in _rthread_free_stack()
134 		free(stack);  in _rthread_free_stack()