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ck_pflock(3)	       FreeBSD Library Functions Manual		  ck_pflock(3)

NAME
     ck_pflock_init, ck_pflock_write_lock, ck_pflock_write_unlock,
     ck_pflock_read_lock, ck_pflock_read_unlock, -- centralized	phase-fair
     reader-writer locks

LIBRARY
     Concurrency Kit (libck, -lck)

SYNOPSIS
     #include <ck_pflock.h>

     ck_pflock_t lock =	CK_PFLOCK_INITIALIZER;

     void
     ck_pflock_init(ck_pflock_t	*lock);

     void
     ck_pflock_write_lock(ck_pflock_t *lock);

     void
     ck_pflock_write_unlock(ck_pflock_t	*lock);

     void
     ck_pflock_read_lock(ck_pflock_t *lock);

     void
     ck_pflock_read_unlock(ck_pflock_t *lock);

DESCRIPTION
     This is a centralized phase-fair reader-writer lock. It requires little
     space overhead and	has a low latency fast path.

EXAMPLE
	   #include <ck_pflock.h>

	   static ck_pflock_t lock = CK_TFLOCK_INITIALIZER;

	   static void
	   reader(void)
	   {

		   for (;;) {
			   ck_pflock_read_lock(&lock);
			   /* Read-side	critical section. */
			   ck_pflock_read_unlock(&lock);
		   }

		   return;
	   }

	   static void
	   writer(void)
	   {

		   for (;;) {
			   ck_pflock_write_lock(&lock);
			   /* Write-side critical section. */
			   ck_pflock_write_unlock(&lock);
		   }

		   return;
	   }

SEE ALSO
     ck_brlock(3), ck_rwlock(3), ck_tflock(3), ck_swlock(3)

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

				April 22, 2014.

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | EXAMPLE | SEE ALSO

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