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#pragma once
#include <kernel/arch/generic.h>
#include <kernel/handle.h>
#include <kernel/vfs/mount.h>
#include <shared/syscalls.h>
enum process_state {
PS_RUNNING,
PS_DEAD, // return message wasn't collected
PS_DEADER, // return message was collected
PS_WAITS4CHILDDEATH,
PS_WAITS4FS,
PS_WAITS4REQUEST,
};
struct process {
struct pagedir *pages;
struct registers regs;
enum process_state state;
struct process *sibling;
struct process *child;
struct process *parent;
uint32_t id; // only for debugging, don't expose to userland
// saved value, meaning depends on .state
union {
int death_msg; // PS_DEAD
struct vfs_request pending_req; // PS_WAITS4FS
struct {
char __user *buf;
int max_len;
struct fs_wait_response __user *res;
} awaited_req; // PS_WAITS4REQUEST
};
struct vfs_request *handled_req;
struct vfs_mount *mount;
struct handle handles[HANDLE_MAX];
};
extern struct process *process_first;
extern struct process *process_current;
// creates the root process
struct process *process_seed(void);
struct process *process_fork(struct process *parent);
_Noreturn void process_switch(struct process *proc);
_Noreturn void process_switch_any(void); // switches to any running process
struct process *process_find(enum process_state);
handle_t process_find_handle(struct process *proc); // finds the first free handle
void process_kill(struct process *proc, int ret);
/** Tries to transistion from PS_DEAD to PS_DEADER.
* @return a nonnegative length of the quit message if successful, a negative val otherwise*/
int process_try2collect(struct process *dead);
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