pthread_rwlock_init(3) - NetBSD Manual Pages

PTHREAD_RWLOCK_INIT(3)  NetBSD Library Functions Manual PTHREAD_RWLOCK_INIT(3)


NAME
pthread_rwlock_init -- initialize a read/write lock
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h> int pthread_rwlock_init(pthread_rwlock_t * restrict lock, const pthread_rwlockattr_t * restrict attr);
DESCRIPTION
The pthread_rwlock_init() function is used to initialize a read/write lock, with attributes specified by attr. If attr is NULL, the default read/write lock attributes are used. The results of calling pthread_rwlock_init() with an already initialized lock are undefined.
RETURN VALUES
If successful, the pthread_rwlock_init() function will return zero. Oth- erwise an error number will be returned to indicate the error.
ERRORS
The pthread_rwlock_init() function shall fail if: [EAGAIN] The system lacks the resources to initialize another read-write lock. [ENOMEM] Insufficient memory exists to initialize the read- write lock. The pthread_rwlock_init() function may fail if: [EBUSY] The system has detected an attempt to re-initialize the object referenced by lock, a previously initial- ized but not yet destroyed read/write lock. [EINVAL] The value specified by attr is invalid.
SEE ALSO
pthread_rwlock_destroy(3), pthread_rwlock_rdlock(3), pthread_rwlock_unlock(3), pthread_rwlock_wrlock(3)
STANDARDS
pthread_rwlock_init() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BUGS
The PTHREAD_PROCESS_SHARED attribute is not supported. NetBSD 5.1.2 January 30, 2003 NetBSD 5.1.2

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