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Man Pages


Manual Reference Pages  -  CK_RWLOCK (3)

NAME

ck_rwlock_init, ck_rwlock_write_lock, ck_rwlock_write_unlock, ck_rwlock_write_trylock, ck_rwlock_write_downgrade, ck_rwlock_locked_writer, ck_rwlock_read_lock, ck_rwlock_read_trylock, ck_rwlock_read_unlock, ck_rwlock_locked_reader, ck_rwlock_recursive_write_lock, ck_rwlock_recursive_write_trylock, ck_rwlock_recurisve_write_unlock, ck_rwlock_recursive_read_lock, ck_rwlock_recursive_read_trylock, ck_rwlock_recursive_read_unlock - centralized write-biased reader-writer locks

CONTENTS

Library
Synopsis
Description
Example
See Also

LIBRARY

Concurrency Kit (libck, -lck)

SYNOPSIS


.In ck_rwlock.h

ck_rwlock_t lock = CK_RWLOCK_INITIALIZER;

void ck_rwlock_init ck_rwlock_t *lock void ck_rwlock_write_lock ck_rwlock_t *lock void ck_rwlock_write_unlock ck_rwlock_t *lock bool ck_rwlock_write_trylock ck_rwlock_t *lock bool ck_rwlock_write_downgrade ck_rwlock_t *lock bool ck_rwlock_locked_writer ck_rwlock_t *lock void ck_rwlock_read_lock ck_rwlock_t *lock bool ck_rwlock_read_trylock ck_rwlock_t *lock void ck_rwlock_read_unlock ck_rwlock_t *lock bool ck_rwlock_locked_reader ck_rwlock_t *lock

ck_rwlock_recursive_t lock = CK_RWLOCK_RECURSIVE_INITIALIZER;

void ck_rwlock_recursive_write_lock ck_rwlock_recursive_t *lock unsigned int tid bool ck_rwlock_recursive_write_trylock ck_rwlock_recursive_t *lock unsigned int tid void ck_rwlock_recurisve_write_unlock ck_rwlock_recursive_t *lock void ck_rwlock_recursive_read_lock ck_rwlock_recursive_t *lock bool ck_rwlock_recursive_read_trylock ck_rwlock_recursive_t *lock void ck_rwlock_recursive_read_unlock ck_rwlock_recursive_t *lock

DESCRIPTION

This is a centralized write-biased reader-writer lock. It requires very little space overhead and has a low latency fast path. Write-side recursion requires usage of ck_rwlock_recursive. Read-side recursion is disallowed. The ck_rwlock_write_downgrade function degrades the caller’s write-side acquisition to a read-side acquisition without forfeit of current critical section.

EXAMPLE

#include <ck_rwlock.h>

static ck_rwlock_t lock = CK_RWLOCK_INITIALIZER;

static void reader(void) {

        for (;;) {                 ck_rwlock_read_lock(&lock);                 /* Read-side critical section. */                 ck_rwlock_read_unlock(&lock);

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

        return; }

static void writer(void) {

        for (;;) {                 ck_rwlock_write_lock(&lock);                 /* Write-side critical section. */                 ck_rwlock_write_unlock(&lock);

                if (ck_rwlock_write_trylock(&lock, 1) == true) {                         /* Write-side critical section. */                         ck_rwlock_write_unlock(&lock);                 }         }

        return; }

SEE ALSO

ck_brlock(3), ck_elide(3)

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

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