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#pragma once
#include <kernel/arch/generic.h>
#include <kernel/handle.h>
#include <kernel/vfs/mount.h>
#include <shared/syscalls.h>
#include <stdbool.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,
PS_WAITS4IRQ, // set by root vfs
PS_LAST,
};
struct process {
struct pagedir *pages;
struct registers regs;
enum process_state state;
bool deathbed; // kill on next process_switch attempt
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 {
struct vfs_request req;
} waits4fs; // PS_WAITS4FS
struct {
char __user *buf;
size_t max_len;
struct fs_wait_response __user *res;
} awaited_req; // PS_WAITS4REQUEST
struct {
struct vfs_request req;
bool (*ready)();
void (*callback)(struct process *);
} waits4irq;
};
struct vfs_request *handled_req;
/* vfs_backend controlled (not exclusively) by this process */
struct vfs_backend *controlled;
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);
void process_free(struct process *);
_Noreturn void process_switch_any(void); // switches to any running process
/** Used for iterating over all processes */
struct process *process_next(struct process *);
struct process *process_find(enum process_state);
size_t process_find_multiple(enum process_state, struct process **buf, size_t max);
handle_t process_find_handle(struct process *proc); // finds the first free handle
void process_transition(struct process *, enum process_state);
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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