pthread_rwlock_wrlock man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]

PTHREAD_RWLOCK_WRLOCK(3) BSD Library Functions Manual PTHREAD_RWLOCK_WRLOCK(3)

NAME
     pthread_rwlock_wrlock, pthread_rwlock_trywrlock — acquire a read/write
     lock for writing

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlock_wrlock(pthread_rwlock_t *lock);

     int
     pthread_rwlock_trywrlock(pthread_rwlock_t *lock);

DESCRIPTION
     The pthread_rwlock_wrlock() function blocks until a write lock can be
     acquired against lock.  The pthread_rwlock_trywrlock() function performs
     the same action, but does not block if the lock cannot be immediately
     obtained.

     The results are undefined if the calling thread already holds the lock at
     the time the call is made.

IMPLEMENTATION NOTES
     To prevent writer starvation, writers are favored over readers.

RETURN VALUES
     If successful, the pthread_rwlock_wrlock() and pthread_rwlock_trywrlock()
     functions will return zero.  Otherwise an error number will be returned
     to indicate the error.

ERRORS
     The pthread_rwlock_trywrlock() function will fail if:

     [EBUSY]		The calling thread is not able to acquire the lock
			without blocking.

     The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions may
     fail if:

     [EDEADLK]		The calling thread already owns the read/write lock
			(for reading or writing).

     [EINVAL]		The value specified by lock is invalid.

     [ENOMEM]		Insufficient memory exists to initialize the lock
			(applies to statically initialized locks only).

SEE ALSO
     pthread_rwlock_init(3), pthread_rwlock_rdlock(3),
     pthread_rwlock_tryrdlock(3), pthread_rwlock_unlock(3)

STANDARDS
     The pthread_rwlock_wrlock() and pthread_rwlock_trywrlock() functions are
     expected to conform to Version 2 of the Single UNIX Specification
     (“SUSv2”).

HISTORY
     The pthread_rwlock_wrlock() function first appeared in FreeBSD 3.0.

BSD				August 4, 1998				   BSD
[top]

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
...................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net