1
0
mirror of https://github.com/vlang/v.git synced 2023-08-10 21:13:21 +03:00
v/vlib/sync/sync_windows.c.v

202 lines
4.1 KiB
V
Raw Normal View History

// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
2019-06-23 05:21:30 +03:00
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
2019-06-22 22:53:22 +03:00
module sync
2019-07-24 18:36:20 +03:00
2020-07-15 11:22:33 +03:00
import time
#include <synchapi.h>
fn C.InitializeConditionVariable(voidptr)
fn C.WakeConditionVariable(voidptr)
fn C.SleepConditionVariableSRW(voidptr, voidptr, u32, u32) int
// TODO: The suggestion of using CriticalSection instead of mutex
// was discussed. Needs consideration.
2019-07-24 18:36:20 +03:00
// Mutex HANDLE
type MHANDLE = voidptr
2020-07-15 11:22:33 +03:00
// Semaphore HANDLE
type SHANDLE = voidptr
2019-06-22 22:53:22 +03:00
2019-10-25 17:24:40 +03:00
//[init_with=new_mutex] // TODO: implement support for this struct attribute, and disallow Mutex{} from outside the sync.new_mutex() function.
// `SRWLOCK` is much more performant that `Mutex` on Windows, so use that in both cases since we don't want to share with other processes
[heap]
pub struct Mutex {
2019-07-24 18:36:20 +03:00
mut:
mx C.SRWLOCK // mutex handle
2019-06-22 22:53:22 +03:00
}
[heap]
pub struct RwMutex {
mut:
mx C.SRWLOCK // mutex handle
}
[heap]
struct Semaphore {
mtx C.SRWLOCK
cond C.CONDITION_VARIABLE
2020-07-15 11:22:33 +03:00
mut:
count u32
}
2019-06-22 22:53:22 +03:00
pub fn new_mutex() &Mutex {
mut m := &Mutex{}
m.init()
return m
2019-10-25 17:24:40 +03:00
}
pub fn new_rwmutex() &RwMutex {
mut m := &RwMutex{}
m.init()
return m
}
pub fn (mut m Mutex) init() {
C.InitializeSRWLock(&m.mx)
}
pub fn (mut m RwMutex) init() {
C.InitializeSRWLock(&m.mx)
}
pub fn (mut m Mutex) @lock() {
C.AcquireSRWLockExclusive(&m.mx)
2019-06-22 22:53:22 +03:00
}
2020-05-17 14:51:18 +03:00
pub fn (mut m Mutex) unlock() {
C.ReleaseSRWLockExclusive(&m.mx)
}
2019-07-24 18:36:20 +03:00
// RwMutex has separate read- and write locks
pub fn (mut m RwMutex) @rlock() {
C.AcquireSRWLockShared(&m.mx)
}
pub fn (mut m RwMutex) @lock() {
C.AcquireSRWLockExclusive(&m.mx)
}
// Windows SRWLocks have different function to unlock
// So provide two functions here, too, to have a common interface
pub fn (mut m RwMutex) runlock() {
C.ReleaseSRWLockShared(&m.mx)
}
pub fn (mut m RwMutex) unlock() {
C.ReleaseSRWLockExclusive(&m.mx)
}
2020-05-17 14:51:18 +03:00
pub fn (mut m Mutex) destroy() {
// nothing to do
}
2020-07-15 11:22:33 +03:00
2020-08-06 16:28:19 +03:00
[inline]
pub fn new_semaphore() &Semaphore {
2020-08-06 16:28:19 +03:00
return new_semaphore_init(0)
}
pub fn new_semaphore_init(n u32) &Semaphore {
mut sem := &Semaphore{}
sem.init(n)
return sem
2020-07-15 11:22:33 +03:00
}
pub fn (mut sem Semaphore) init(n u32) {
C.atomic_store_u32(&sem.count, n)
C.InitializeSRWLock(&sem.mtx)
C.InitializeConditionVariable(&sem.cond)
}
pub fn (mut sem Semaphore) post() {
mut c := C.atomic_load_u32(&sem.count)
for c > 1 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c + 1) {
return
}
}
C.AcquireSRWLockExclusive(&sem.mtx)
c = C.atomic_fetch_add_u32(&sem.count, 1)
if c == 0 {
C.WakeConditionVariable(&sem.cond)
}
C.ReleaseSRWLockExclusive(&sem.mtx)
2020-07-15 11:22:33 +03:00
}
pub fn (mut sem Semaphore) wait() {
mut c := C.atomic_load_u32(&sem.count)
for c > 0 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c - 1) {
return
}
}
C.AcquireSRWLockExclusive(&sem.mtx)
c = C.atomic_load_u32(&sem.count)
outer: for {
if c == 0 {
C.SleepConditionVariableSRW(&sem.cond, &sem.mtx, C.INFINITE, 0)
c = C.atomic_load_u32(&sem.count)
}
for c > 0 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c - 1) {
if c > 1 {
C.WakeConditionVariable(&sem.cond)
}
break outer
}
}
}
C.ReleaseSRWLockExclusive(&sem.mtx)
2020-07-15 11:22:33 +03:00
}
pub fn (mut sem Semaphore) try_wait() bool {
mut c := C.atomic_load_u32(&sem.count)
for c > 0 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c - 1) {
return true
}
}
return false
2020-07-15 11:22:33 +03:00
}
pub fn (mut sem Semaphore) timed_wait(timeout time.Duration) bool {
mut c := C.atomic_load_u32(&sem.count)
for c > 0 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c - 1) {
return true
}
}
C.AcquireSRWLockExclusive(&sem.mtx)
t_ms := u32(timeout / time.millisecond)
mut res := 0
c = C.atomic_load_u32(&sem.count)
outer: for {
if c == 0 {
res = C.SleepConditionVariableSRW(&sem.cond, &sem.mtx, t_ms, 0)
if res == 0 {
break outer
}
c = C.atomic_load_u32(&sem.count)
}
for c > 0 {
if C.atomic_compare_exchange_weak_u32(&sem.count, &c, c - 1) {
if c > 1 {
C.WakeConditionVariable(&sem.cond)
}
break outer
}
}
}
C.ReleaseSRWLockExclusive(&sem.mtx)
return res != 0
2020-07-15 11:22:33 +03:00
}
2020-08-06 16:28:19 +03:00
pub fn (s Semaphore) destroy() bool {
return true
2020-08-06 16:28:19 +03:00
}