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use bytes;
use fmt;
use io;
use os;
use sys;
use sort;
use sort::cmp;
use strings;
use types;
def JOBS: size = 4;
type stat = struct {
min: i64,
max: i64,
sum: i64,
count: size
};
type thread_job = struct {
chunk: []u8,
map: hashmap,
names_buf: [10000](size, str),
names: [](size, str)
};
const jobs: [JOBS]thread_job = [thread_job { ... }...];
fn i64parse(bytes: []u8) (i64, size) = {
let index = 0z;
let u: i64 = 0;
let neg = 1;
if (bytes[index] == '-') {
neg = -1;
index += 1;
};
u = (bytes[index] - '0'): i64;
index += 1;
if (bytes[index] != '.') {
u = u * 10 + (bytes[index] - '0'): i64;
index += 1;
};
index += 1;
u = u * 10 + (bytes[index] - '0'): i64;
index += 2;
return (u * neg, index);
};
@test fn parsei64() void = {
assert(i64parse(strings::toutf8("0.0")).0 == 0);
assert(i64parse(strings::toutf8("9.2")).0 == 92);
assert(i64parse(strings::toutf8("-9.2")).0 == -92);
assert(i64parse(strings::toutf8("98.2")).0 == 982);
assert(i64parse(strings::toutf8("-98.2")).0 == -982);
};
fn work(arg: *opaque) nullable *opaque = {
let job = arg: *thread_job;
for (true) {
let hash = 14695981039346656037z;
let sep_idx = 0z;
let has_semi = false;
for (const char .. job.chunk) {
if (char == ';') {
has_semi = true;
break;
};
hash ^= char;
hash *= 1099511628211;
sep_idx += 1;
};
if (!has_semi) break;
let after = job.chunk[sep_idx + 1..];
const name = strings::fromutf8_unsafe(job.chunk[..sep_idx]);
const (temp, index) = i64parse(after);
job.chunk = after[index..];
let stat = getitem(&job.map, hash);
if (stat.count == 0) {
static append(job.names, (hash, strings::dup(name)!))!;
stat.min = temp;
stat.max = temp;
} else {
if (stat.min > temp)
stat.min = temp;
if (stat.max < temp)
stat.max = temp;
};
stat.sum += temp;
stat.count += 1;
setitem(&job.map, hash, stat);
};
return null;
};
fn mmap(fd: io::file) []u8 = {
let st = sys::st { ... };
sys::fstat(fd, &st)!;
let ptr = sys::mmap(null, st.sz, sys::PROT_READ, sys::MAP_PRIVATE, fd, 0)!;
// Hardcoded value for MADV_SEQUENTIAL, from libc-rs it seems like it's
// 2 on all currently supported platforms (Linux, FreeBSD, NetBSD,
// OpenBSD, Dragonfly).
assert(sys::syscall(sys::SYS_madvise, ptr: uintptr: u64, st.sz: u64, 2) == 0);
return *(&types::slice {
data = ptr,
length = st.sz,
capacity = 0
}: *[]u8);
};
fn munmap(map: []u8) void = {
let map = &map: *types::slice;
sys::munmap(map.data: *opaque, map.length)!;
};
fn names_cmp(a: *opaque, b: *opaque) int = {
const a = *(a: *(size, str));
const b = *(b: *(size, str));
return cmp::strs(&a.1, &b.1);
};
export fn main() void = {
if (len(os::args) > 2)
fmt::fatalf("usage: {} <file>", os::args[0]);
let file = "measurements.txt";
if (len(os::args) == 2)
file = os::args[1];
const handle = os::open(file)!;
defer io::close(handle)!;
const map = mmap(handle);
defer munmap(map);
const chunk_size = len(map) / JOBS;
let threads: [JOBS]pthread_t = [0...];
let at = 0z;
for (let i = 0z; i < JOBS; i += 1) {
const start = at;
let end = at + chunk_size;
if (end < len(map)) {
let newline_at = match(bytes::index(map[end..], '\n')) {
case let idx: size =>
yield idx;
case void =>
abort();
};
end = end + newline_at + 1;
} else {
end = len(map);
};
jobs[i].chunk = map[start..end];
jobs[i].names = jobs[i].names_buf[..0];
pthread_create(&threads[i], null, &work, &jobs[i])!;
at = end;
};
for (const thread .. threads)
pthread_join(thread, null)!;
let names_buf: [10000](size, str) = [(0, "")...];
let names = names_buf[..0];
let stats: hashmap = [(0, stat { ... })...];
for (let job &.. jobs) {
for (let (hash, name) .. job.names) {
let stat = getitem(&stats, hash);
let new_stat = getitem(&job.map, hash);
if (stat.count == 0) {
static append(names, (hash, strings::dup(name)!))!;
stat.min = new_stat.min;
stat.max = new_stat.max;
} else {
if (stat.min > new_stat.min)
stat.min = new_stat.min;
if (stat.max < new_stat.max)
stat.max = new_stat.max;
};
stat.sum += new_stat.sum;
stat.count += new_stat.count;
setitem(&stats, hash, stat);
};
};
sort::sort(names, size((size, str)), &names_cmp)!;
fmt::print("{")!;
for (let i = 0z; i < len(names); i += 1) {
let station = names[i].1;
let item = getitem(&stats, names[i].0);
if (i > 0)
fmt::print(", ")!;
fmt::printf("{}={:.1f}/{:.1f}/{:.1f}",
station,
item.min: f64 / 10.0,
item.sum: f64 / 10.0 / item.count: f64,
item.max: f64 / 10.0,
)!;
free(names[i].1);
};
fmt::println("}")!;
};
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