问题
When I create multiple threads from a process, then does each thread have its own stack, or is it that they share the stack of their parent process. What happens when a thread makes a system call? Do threads also maintain their own kernel stack like processes?
回答1:
Yes threads have their own stacks and their own kernel stacks (e.g. linux).
When a thread makes a system call, you trap into kernel mode (from user mode), you pass the arguments to the kernel, the arguments are checked, the kernel does w/e it needs to do (in the kernel stack), returns the final value back to the thread and you go back to user mode.
来源：https://stackoverflow.com/questions/18350219/does-each-thread-have-its-own-stack