01-23-2006
ZB,
The AIX admin says that he is not going to grant write access to a system library. It is set the way the OS installs it and he will not touch it.
Do I need write acess or need read and Execute acess? Right now the acess for this file is -r-xr-xr-x
Thanks.
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LEARN ABOUT OSF1
pthread_rwlock_trywrlock
pthread_rwlock_trywrlock(3) Library Functions Manual pthread_rwlock_trywrlock(3)
NAME
pthread_rwlock_trywrlock - Attempts to acquire a read-write lock for write access without waiting.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_rwlock_trywrlock(
pthread_rwlock_t *rwlock);
PARAMETERS
Address of the read-write lock object to acquire for write access.
DESCRIPTION
This routine attempts to acquire the read-write lock referenced by rwlock for write access. If any thread already holds that lock for write
access or read access, this routine fails and returns [EBUSY] and the calling thread does not wait for the lock to become available.
Results are undefined if the calling thread holds the read-write lock (whether for read or write access) at the time this routine is
called.
If the read-write lock object referenced by rwlock is not initialized, the results of calling this routine are undefined.
Realtime applications can encounter priority inversion when using read-write locks. The problem occurs when a high-priority thread acquires
a read-write lock that is about to be unlocked (that is, posted) by a low-priority thread, but the low-priority thread is preempted by a
medium-priority thread. This scenario leads to priority inversion in that a high-priority thread is blocked by lower-priority threads for
an unlimited period of time. During system design, realtime programmers must take into account the possibility of priority inversion and
can deal with it in a number of ways, such as by having critical sections that are guarded by read-write locks execute at a high priority,
so that a thread cannot be preempted while executing in its critical section.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The read-write lock could not be acquired for write access because it was already locked for write access or for
read access. The value specified by rwlock does not refer to an initialized read-write lock object. The current thread already owns the
read-write lock for write or read access.
ERRORS
None
RELATED INFORMATION
Functions: pthread_rwlock_init(3), pthread_rwlockattr_init(3), pthread_rwlock_rdlock(3), pthread_rwlock_wrlock(3), pthread_rwlock_unlock(3)
Manuals: Guide to DECthreads and Programmer's Guide
delim off
pthread_rwlock_trywrlock(3)