143 lines
3.2 KiB
V
143 lines
3.2 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module sync
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import time
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// There's no additional linking (-lpthread) needed for Android.
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// See https://stackoverflow.com/a/31277163/1904615
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$if !android {
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#flag -lpthread
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}
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#include <semaphore.h>
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[trusted]
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fn C.pthread_mutex_init(voidptr, voidptr) int
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fn C.pthread_mutex_lock(voidptr) int
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fn C.pthread_mutex_unlock(voidptr) int
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fn C.pthread_mutex_destroy(voidptr) int
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fn C.pthread_rwlockattr_init(voidptr) int
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fn C.pthread_rwlockattr_setkind_np(voidptr, int) int
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fn C.pthread_rwlockattr_setpshared(voidptr, int) int
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fn C.pthread_rwlock_init(voidptr, voidptr) int
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fn C.pthread_rwlock_rdlock(voidptr) int
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fn C.pthread_rwlock_wrlock(voidptr) int
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fn C.pthread_rwlock_unlock(voidptr) int
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fn C.sem_init(voidptr, int, u32) int
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fn C.sem_post(voidptr) int
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fn C.sem_wait(voidptr) int
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fn C.sem_trywait(voidptr) int
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fn C.sem_timedwait(voidptr, voidptr) int
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fn C.sem_destroy(voidptr) int
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// [init_with=new_mutex] // TODO: implement support for this struct attribute, and disallow Mutex{} from outside the sync.new_mutex() function.
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[heap]
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pub struct Mutex {
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mutex C.pthread_mutex_t
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}
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[heap]
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pub struct RwMutex {
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mutex C.pthread_rwlock_t
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}
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struct RwMutexAttr {
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attr C.pthread_rwlockattr_t
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}
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[heap]
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struct Semaphore {
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sem C.sem_t
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}
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pub fn new_mutex() &Mutex {
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mut m := &Mutex{}
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m.init()
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return m
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}
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pub fn (mut m Mutex) init() {
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C.pthread_mutex_init(&m.mutex, C.NULL)
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}
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pub fn new_rwmutex() &RwMutex {
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mut m := &RwMutex{}
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m.init()
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return m
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}
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pub fn (mut m RwMutex) init() {
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a := RwMutexAttr{}
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C.pthread_rwlockattr_init(&a.attr)
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// Give writer priority over readers
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C.pthread_rwlockattr_setkind_np(&a.attr, C.PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP)
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C.pthread_rwlockattr_setpshared(&a.attr, C.PTHREAD_PROCESS_PRIVATE)
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C.pthread_rwlock_init(&m.mutex, &a.attr)
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}
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// @lock(), for *manual* mutex handling, since `lock` is a keyword
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pub fn (mut m Mutex) @lock() {
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C.pthread_mutex_lock(&m.mutex)
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}
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pub fn (mut m Mutex) unlock() {
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C.pthread_mutex_unlock(&m.mutex)
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}
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// RwMutex has separate read- and write locks
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pub fn (mut m RwMutex) @rlock() {
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C.pthread_rwlock_rdlock(&m.mutex)
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}
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pub fn (mut m RwMutex) @lock() {
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C.pthread_rwlock_wrlock(&m.mutex)
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}
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// Windows SRWLocks have different function to unlock
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// So provide two functions here, too, to have a common interface
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pub fn (mut m RwMutex) runlock() {
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C.pthread_rwlock_unlock(&m.mutex)
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}
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pub fn (mut m RwMutex) unlock() {
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C.pthread_rwlock_unlock(&m.mutex)
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}
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[inline]
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pub fn new_semaphore() &Semaphore {
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return new_semaphore_init(0)
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}
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pub fn new_semaphore_init(n u32) &Semaphore {
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mut sem := &Semaphore{}
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sem.init(n)
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return sem
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}
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pub fn (mut sem Semaphore) init(n u32) {
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C.sem_init(&sem.sem, 0, n)
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}
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pub fn (mut sem Semaphore) post() {
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C.sem_post(&sem.sem)
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}
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pub fn (mut sem Semaphore) wait() {
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C.sem_wait(&sem.sem)
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}
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pub fn (mut sem Semaphore) try_wait() bool {
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return C.sem_trywait(&sem.sem) == 0
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}
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pub fn (mut sem Semaphore) timed_wait(timeout time.Duration) bool {
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t_spec := timeout.timespec()
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return C.sem_timedwait(&sem.sem, &t_spec) == 0
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}
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pub fn (sem Semaphore) destroy() bool {
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return C.sem_destroy(&sem.sem) == 0
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}
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