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Man Pages


Manual Reference Pages  -  CK_SWLOCK (3)

NAME

ck_swlock_init, ck_swlock_write_latch, ck_swlock_write_unlatch, ck_swlock_write_lock, ck_swlock_write_unlock, ck_swlock_write_trylock, ck_swlock_write_downgrade, ck_swlock_locked_writer, ck_swlock_read_lock, ck_swlock_read_trylock, ck_swlock_read_unlock, ck_swlock_locked_reader - centralized copy-safe write-biased single-writer read-write locks

CONTENTS

Library
Synopsis
Description
Example
See Also

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS


.In ck_swlock.h

ck_swlock_t lock = CK_SWLOCK_INITIALIZER;

void ck_swlock_init ck_swlock_t *lock void ck_swlock_write_lock ck_swlock_t *lock void ck_swlock_write_unlock ck_swlock_t *lock void ck_swlatch_write_latch ck_swlatch_t *latch void ck_swlatch_write_unlatch ck_swlatch_t *latch bool ck_swlock_write_trylock ck_swlock_t *lock bool ck_swlock_write_downgrade ck_swlock_t *lock bool ck_swlock_locked_writer ck_swlock_t *lock void ck_swlock_read_lock ck_swlock_t *lock bool ck_swlock_read_trylock ck_swlock_t *lock void ck_swlock_read_unlock ck_swlock_t *lock bool ck_swlock_locked_reader ck_swlock_t *lock

DESCRIPTION

This is a centralized write-biased single-writer reader-writer lock. It requires half the space that ck_rwlock does and has a low latency fast path. The lock supports latch and unlatch operations that allow it to be used in a copy-safe manner (reader-bits may be over-written safely).

EXAMPLE

#include <ck_swlock.h>

static ck_swlock_t lock = CK_SWLOCK_INITIALIZER;

static void reader(void) {

        for (;;) {                 ck_swlock_read_lock(&lock);                 /* Read-side critical section. */                 ck_swlock_read_unlock(&lock);

                if (ck_swlock_read_trylock(&lock) == true) {                         /* Read-side critical section. */                         ck_swlock_read_unlock(&lock);                 }         }

        return; }

static void writer(void) {         ck_swlock_t contrived;

        for (;;) {                 ck_swlock_write_lock(&lock);                 /* Write-side critical section. */                 ck_swlock_write_unlock(&lock);

                if (ck_swlock_write_trylock(&lock) == true) {                         /* Write-side critical section. */                         ck_swlock_write_unlock(&lock);                 }

                ck_swlock_write_latch(&lock);                 /* Write-side critical section. */

                /* This is safe to do with-in a latch. */                 contrived = lock;                 lock = contrived;                 ck_swlock_write_unlatch(&lock);         }

        return; }

SEE ALSO

ck_brlock(3), ck_elide(3), ck_pflock(3), ck_rwlock(3), ck_tflock(3)

Additional information available at http://concurrencykit.org/

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