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View Code? Open in Web Editor NEW知名开源代码库的注释版:C++、Golang等
Home Page: https://www.cyhone.com
知名开源代码库的注释版:C++、Golang等
Home Page: https://www.cyhone.com
static void
_save_stack(struct coroutine *C, char *top) {
// 这个dummy很关键,是求取整个栈的关键
// 这个非常经典,涉及到linux的内存分布,栈是从高地址向低地址扩展,因此
// S->stack + STACK_SIZE就是运行时栈的栈底
// dummy,此时在栈中,肯定是位于最底的位置的,即栈顶
// top - &dummy 即整个栈的容量
char dummy = 0;
assert(top - &dummy <= STACK_SIZE);
if (C->cap < top - &dummy) {
free(C->stack);
C->cap = top-&dummy;
C->stack = malloc(C->cap);
}
C->size = top - &dummy;
memcpy(C->stack, &dummy, C->size);
}
请问 top - &dummy为什么是整个栈的容量,栈的容量不应该是STACK_SIZE吗?。
dummy的定义为char dummy = 0; 它代表了什么含义。&dummy指的是什么地址呢?
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