The approach which I have tried in Windows that works is by opening the device directly as a file (using the PhysicalDrive# handle) and start issuing read / write commands, which returns failure for bad sector write calls.
Another approach which I have seen but not really tried is to call DeviceIOControl with IOCTL_ATA* commands.
How to use X11 without Xlib not XCB? How draw window directly on low level?
I must use anyway window manager like Motif?
I have ridden that X11 has server-client architecture, client send via TCP/IP to port 6000 request for primitives and get replies.
Where is detailed description of it? In X11... (0 Replies)
Hi friends,
I hope everyone is doing well and fine. I have always been hearing that C/C++ are relatively low-level as compared to Java/C# etc. Could you please tell me some low-level qualities of C/C++? And I think disk deframenters are written in C/C++, please correct me if I am wrong. And please... (5 Replies)
Hi friends,
I hope everyone is fine and doing well. I queried in my previous thread about the low-level qualities of C/C++ languages.I really thank you people for explaining, it was really helpful. One more ambiquity that I have in my mind is regarding the unix system calls like open, creat,... (1 Reply)
Hello All
I have a system running AIX 61 shared uncapped partition (with 11 physical processors, 24 Virtual 72GB of Memory) .
The output from NMON, vmstat show a high run queue (60+) for continous periods of time intervals, but NO paging, relatively low I/o (6000) , CPU % is 40, Low network.... (9 Replies)
Hi,
What is the best reference that gives in detail on nic cards configuration , assigning multiple ip addresses to a single interface, netlink library etc and all basic stuff at this level..?
Thanks (2 Replies)
I want to do a low level format like in windows (C:\format c:) but I don't know how it works in unix or linux.. Can somebody help me ? thnx :) (3 Replies)
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
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pthread_rwlock_trywrlock(3)