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use crate::alloc::MemPool;
use crate::ll::*;
use crate::ptr::Ptr;
use crate::stm::*;
use crate::*;
use std::collections::HashMap;
use std::fmt::{self, Debug, Formatter};
#[cfg(all(feature = "use_pspd", feature = "use_vspd"))]
compile_error!("Cannot use both volatile and persistent scratchpad");
#[cfg(all(feature = "use_pspd", not(feature = "use_vspd")))]
use crate::stm::pspd::Scratchpad;
#[cfg(all(feature = "use_vspd", not(feature = "use_pspd")))]
use crate::stm::vspd::Scratchpad;
pub const JOURNAL_COMMITTED: u64 = 0x0000_0001;
pub struct Journal<A: MemPool> {
pages: Ptr<Page<A>, A>,
#[cfg(feature = "pin_journals")]
current: Ptr<Page<A>, A>,
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))]
spd: Scratchpad<A>,
gen: u32,
flags: u64,
sec_id: u64,
prev_off: u64,
next_off: u64,
chaperon: [u8;64],
}
impl<A: MemPool> !PSafe for Journal<A> {}
impl<A: MemPool> !Send for Journal<A> {}
impl<A: MemPool> !Sync for Journal<A> {}
impl<A: MemPool> !TxOutSafe for Journal<A> {}
impl<A: MemPool> !TxInSafe for Journal<A> {}
impl<A: MemPool> !LooseTxInUnsafe for Journal<A> {}
impl<A: MemPool> !std::panic::RefUnwindSafe for Journal<A> {}
impl<A: MemPool> !std::panic::UnwindSafe for Journal<A> {}
#[derive(Clone, Copy)]
struct Page<A: MemPool> {
len: usize,
head: usize,
next: Ptr<Page<A>, A>,
logs: [Log<A>; PAGE_LOG_SLOTS],
}
impl<A: MemPool> Page<A> {
#[inline]
fn write(&mut self, log: LogEnum, notifier: Notifier<A>) -> Ptr<Log<A>, A> {
#[cfg(not(feature = "use_ntstore"))] {
self.logs[self.len] = Log::new(log, notifier);
}
#[cfg(feature = "use_ntstore")] unsafe {
std::intrinsics::nontemporal_store(&mut self.logs[self.len], Log::new(log, notifier));
}
persist(&self.logs[self.len], std::mem::size_of::<Log<A>>(), false);
let log = unsafe { Ptr::new_unchecked(&self.logs[self.len]) };
self.len += 1;
log
}
#[inline]
fn is_full(&self) -> bool {
self.len == PAGE_LOG_SLOTS
}
unsafe fn notify(&mut self) {
for i in 0..self.len {
self.logs[i].notify(0);
}
}
unsafe fn commit(&mut self) {
for i in 0..self.len {
self.logs[i].commit();
}
}
unsafe fn rollback(&mut self) {
for i in 0..self.len {
self.logs[i].rollback();
}
}
unsafe fn recover(&mut self, rollback: bool) {
for i in 0..self.len {
self.logs[self.len - i - 1].recover(rollback);
}
}
unsafe fn ignore(&mut self) {
self.len = 0;
self.head = 0;
self.logs = [Default::default(); PAGE_LOG_SLOTS];
}
unsafe fn clear(&mut self) {
for i in self.head..self.len {
self.logs[i].clear();
self.head += 1;
}
#[cfg(feature = "pin_journals")]
{
self.head = 0;
self.len = 0;
}
}
fn into_iter(&self) -> std::vec::IntoIter<Log<A>> {
Vec::from(self.logs).into_iter()
}
}
impl<A: MemPool> Debug for Page<A> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
writeln!(f, "LOGS:")?;
for i in 0..self.len {
writeln!(f, " {:?}", self.logs[i])?;
}
Ok(())
}
}
impl<A: MemPool> Journal<A> {
pub unsafe fn new(gen: u32) -> Self {
Self {
pages: Ptr::dangling(),
#[cfg(feature = "pin_journals")]
current: Ptr::dangling(),
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))]
spd: Scratchpad::new(),
gen,
flags: 0,
sec_id: 0,
next_off: u64::MAX,
prev_off: u64::MAX,
chaperon: [0; 64],
}
}
pub fn gen(&self) -> u32 {
self.gen
}
pub fn is_committed(&self) -> bool {
self.is_set(JOURNAL_COMMITTED)
}
pub unsafe fn set(&mut self, flag: u64) {
self.flags |= flag;
persist_obj(&self.flags, true);
}
pub unsafe fn unset(&mut self, flag: u64) {
self.flags &= !flag;
}
pub fn is_set(&self, flag: u64) -> bool {
self.flags & flag == flag
}
pub unsafe fn enter_into(&mut self, head_off: &u64, zone: usize) {
let me = A::off_unchecked(self);
self.next_off = *head_off;
A::log64(A::off_unchecked(head_off), me, zone);
if let Ok(j) = A::deref_mut::<Journal<A>>(*head_off) {
A::log64(A::off_unchecked(&j.prev_off), me, zone);
}
}
#[inline]
#[cfg(feature = "pin_journals")]
fn next_page(&self, page: Ptr<Page<A>, A>) -> Ptr<Page<A>, A> {
if page.is_dangling() {
self.new_page()
} else if page.is_full() {
self.next_page(page.next)
} else {
page
}
}
#[cfg(feature = "pin_journals")]
pub(crate) fn write(&self, log: LogEnum, notifier: Notifier<A>) -> Ptr<Log<A>, A> {
let mut page = self.next_page(self.current);
page.as_mut().write(log, notifier)
}
#[inline]
fn new_page(&self) -> Ptr<Page<A>, A> {
#[cfg(feature = "stat_perf")]
let _perf = crate::stat::Measure::<A>::NewPage(std::time::Instant::now());
unsafe {
let page = Page::<A> {
len: 0,
head: 0,
next: self.pages,
logs: [Default::default(); PAGE_LOG_SLOTS]
};
let (_, off, _, z) = A::atomic_new(page);
A::log64(A::off_unchecked(self.pages.off_ref()), off, z);
#[cfg(feature = "pin_journals")] {
A::log64(A::off_unchecked(self.current.off_ref()), off, z);
}
A::perform(z);
self.pages
}
}
#[cfg(not(feature = "pin_journals"))]
pub(crate) fn write(&self, log: LogEnum, notifier: Notifier<A>) -> Ptr<Log<A>, A> {
let mut page = if self.pages.is_dangling() {
self.new_page()
} else if self.pages.is_full() {
self.new_page()
} else {
self.pages
};
page.as_mut().write(log, notifier)
}
#[cfg(feature = "pin_journals")]
pub unsafe fn drop_pages(&mut self) {
while let Some(page) = self.pages.clone().as_option() {
let nxt = page.next;
let z = A::pre_dealloc(page.as_mut_ptr() as *mut u8, std::mem::size_of::<Page<A>>());
A::log64(A::off_unchecked(self.pages.off_ref()), nxt.off(), z);
A::perform(z);
}
self.current = Ptr::dangling();
self.pages = Ptr::dangling();
}
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))]
#[inline]
pub(crate) fn draft<T: ?Sized>(&self, val: &T) -> Option<*mut T> {
unsafe {
if let Ok(off) = A::off(val) {
Some(utils::as_mut(self).spd.write(val, off))
} else {
None
}
}
}
pub fn recovery_info(&self, info_level: u32) -> String {
let mut i = 1;
let mut _cidx = 1;
let mut log_cnt = HashMap::<String, u64>::new();
let mut curr = self.pages;
let mut pgs = vec![];
while let Some(page) = curr.as_option() {
if info_level > 2 {
pgs.push(format!(" page {:<3} at offset {:x} (len = {}, full = {})", i, page.off(), page.len, page.is_full()));
}
#[cfg(feature = "pin_journals")] {
if self.current == *page {
_cidx = i;
}
}
for log in page.into_iter() {
let entry = log_cnt.entry(log.kind()).or_default();
*entry += 1;
if info_level > 3 && log != LogEnum::None {
pgs.push(format!(" {:?}", log));
}
}
i += 1;
curr = page.next;
}
let mut total_logs = 0;
let mut logs_indv = vec![];
for (kind, count) in log_cnt {
if kind != "None" {
total_logs += count;
}
if info_level > 1 {
logs_indv.push(format!(" {:<16} {}", kind, count));
}
}
let mut res = format!("Committed: {}\n",
if self.is_committed() { "Yes" } else { "No" });
res += &format!("Chaperoned session id: {}\n", self.sec_id);
res += &format!("Chaperone file: {}\n", String::from_utf8(self.chaperon.to_vec()).unwrap_or("".to_string()));
res += &format!("Number of pages: {}\n", i-1);
#[cfg(feature = "pin_journals")] {
res += &format!("current page at offset {:x} (index = {})", self.current.off(), _cidx);
}
res += &format!("Number of logs: {}\n", total_logs);
if info_level > 1 {
for ln in logs_indv {
res += &format!("{}\n", ln);
}
}
if info_level > 2 {
res += "Contents:\n";
for ln in pgs {
res += &format!("{}\n", ln);
}
}
res
}
pub unsafe fn commit(&mut self) {
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))] {
self.spd.commit();
}
let mut curr = self.pages;
while let Some(page) = curr.as_option() {
page.notify();
curr = page.next;
}
let mut curr = self.pages;
while let Some(page) = curr.as_option() {
page.commit();
curr = page.next;
}
sfence();
self.set(JOURNAL_COMMITTED);
}
pub unsafe fn rollback(&mut self) {
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))] {
self.spd.rollback();
}
let mut curr = self.pages;
while let Some(page) = curr.as_option() {
page.notify();
curr = page.next;
}
let mut curr = self.pages;
while let Some(page) = curr.as_option() {
page.rollback();
curr = page.next;
}
sfence();
self.set(JOURNAL_COMMITTED);
}
pub unsafe fn recover(&mut self) {
let mut curr = self.pages;
while let Some(page) = curr.as_option() {
page.notify();
curr = page.next;
}
let mut curr = self.pages;
let fast_forward = self.fast_forward();
if !self.is_set(JOURNAL_COMMITTED) || fast_forward {
let rollback = !fast_forward || !self.is_set(JOURNAL_COMMITTED);
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))] {
if rollback {
self.spd.rollback();
} else {
self.spd.recover();
}
}
while let Some(page) = curr.as_option() {
page.recover(rollback);
curr = page.next;
}
self.set(JOURNAL_COMMITTED);
}
}
pub unsafe fn clear(&mut self) {
#[cfg(any(feature = "use_pspd", feature = "use_vspd"))] {
self.spd.clear();
}
#[cfg(feature = "pin_journals")]
{
let mut page = self.pages.as_option();
while let Some(p) = page {
p.clear();
page = p.next.as_option();
}
self.current = self.pages;
}
#[cfg(not(feature = "pin_journals"))] {
while let Some(page) = self.pages.as_option() {
let nxt = page.next;
page.clear();
let z = A::pre_dealloc(page.as_mut_ptr() as *mut u8, std::mem::size_of::<Page<A>>());
A::log64(A::off_unchecked(self.pages.off_ref()), nxt.off(), z);
A::perform(z);
}
}
self.complete();
#[cfg(not(feature = "pin_journals"))] {
A::drop_journal(self);
A::journals(|journals| {
journals.remove(&std::thread::current().id());
});
}
}
pub fn fast_forward(&self) -> bool {
if !self.is_set(JOURNAL_COMMITTED) {
false
} else {
if self.sec_id != 0 && !self.chaperon.is_empty() {
let s = String::from_utf8(self.chaperon.to_vec()).unwrap();
let c = unsafe { Chaperon::load(&s)
.expect(&format!("Missing chaperon file `{}`", s)) };
if c.completed() {
true
} else {
false
}
} else {
true
}
}
}
pub(crate) fn start_session(&mut self, chaperon: &mut Chaperon) {
let mut filename = [0u8; 64];
let s = chaperon.filename().as_bytes();
for i in 0..usize::min(64,s.len()) {
filename[i] = s[i];
}
if self.sec_id != 0 {
if self.chaperon != filename {
panic!("Cannot attach to another chaperoned session");
}
return;
}
self.chaperon = filename;
self.sec_id = chaperon.new_section() as u64;
}
pub(crate) fn complete(&mut self) {
if self.sec_id != 0 && !self.chaperon.is_empty() {
unsafe {
let s = String::from_utf8(self.chaperon.to_vec()).unwrap();
if let Ok(c) = Chaperon::load(&s) {
let id = self.sec_id;
self.chaperon = [0; 64];
self.sec_id = 0;
persist_obj(&self.sec_id, true);
c.finish(id as usize);
} else {
self.chaperon = [0; 64];
self.sec_id = 0;
}
}
}
}
pub(crate) fn next(&self) -> Ptr<Journal<A>, A> {
unsafe { Ptr::from_off_unchecked(self.next_off) }
}
pub unsafe fn next_off(&self) -> u64 {
self.next_off
}
pub unsafe fn prev_off(&self) -> u64 {
self.prev_off
}
pub unsafe fn next_off_ref(&self) -> &u64 {
&self.next_off
}
pub unsafe fn prev_off_ref(&self) -> &u64 {
&self.prev_off
}
#[track_caller]
pub unsafe fn current(create: bool) -> Option<(*const Journal<A>, *mut i32)>
where
Self: Sized,
{
let tid = std::thread::current().id();
A::journals(|journals| {
if !journals.contains_key(&tid) && create {
#[cfg(feature = "stat_perf")]
let _perf = crate::stat::Measure::<A>::NewJournal(std::time::Instant::now());
let (journal, offset, _, z) = A::atomic_new(Journal::<A>::new(A::tx_gen()));
journal.enter_into(A::journals_head(), z);
A::perform(z);
journals.insert(tid, (offset, 0));
}
if let Some((j, c)) = journals.get_mut(&tid) {
Some((Ptr::<Self, A>::from_off_unchecked(*j).as_ptr(), c as *mut i32))
} else {
None
}
})
}
pub fn is_running() -> bool {
if let Some((_, cnt)) = Self::try_current() {
unsafe {*cnt != 0}
} else {
false
}
}
pub(crate) fn try_current() -> Option<(*const Journal<A>, *mut i32)>
where
Self: Sized,
{
unsafe {
let tid = std::thread::current().id();
A::journals(|journals| {
if !journals.contains_key(&tid) {
None
} else {
if let Some((j, c)) = journals.get_mut(&tid) {
Some((Ptr::<Self, A>::from_off_unchecked(*j).as_ptr(), c as *mut i32))
} else {
None
}
}
})
}
}
pub unsafe fn ignore(&self) {
let mut page = utils::as_mut(self).pages.as_option();
while let Some(p) = page {
p.ignore();
page = p.next.as_option();
}
}
}
impl<A: MemPool> Debug for Journal<A> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
writeln!(f, "LOGS:")?;
let mut curr = self.pages.clone();
while let Some(page) = curr.as_option() {
page.fmt(f)?;
curr = page.next;
}
Ok(())
}
}