06-23-2010
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
hi, is there any command where we can monitor semaphores? (1 Reply)
Discussion started by: yls177
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2. UNIX for Dummies Questions & Answers
Hi,
I'm new to UNIX.
I need to know what's a semaphore
Do reply.
Thanks
VJ (3 Replies)
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Hi
Could anybody tell me how can i see the semaphore limits on my system.
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I am looking to use a semaphore for the first time in one of my scripts. I am just wondering if there are any simple examples or tutorials around?
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-Jaken (2 Replies)
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what is semaphore? can any body explain it in a more simple way than the manual ??
replies appreciated
Regards
raguram R (7 Replies)
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6. Programming
In my server code there is a thread per client...
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Control two exclusively shared resources(semaphore). The two resources are two files. The producer will write even numbers to one file, and odd numbers to another one. The consumer respectively reads from each file until it gets 5 even numbers and 5 odd numbers.
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8. Programming
If I create a semaphore and then I fork a number of child processes then all the child process use that same semaphore.
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9. Solaris
Can anyone tell me abt the Semaphore concept and what is semaphore???
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Discussion started by: aarjun07
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10. UNIX for Beginners Questions & Answers
I was asked to add this piece of code to a c program which I will execute through the shell:
for(long i = 0; i < NITER; i++)
{ sem_wait( &sema);
count++;
sem_post( &sema); }
I didn't get it, which is the critical section ? if it's "count++" how would a thread wake up in order to enter it... (1 Reply)
Discussion started by: uniran
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LEARN ABOUT HPUX
pthread_get_nice_np
pthread_get_nice_np(3T) pthread_get_nice_np(3T)
NAME
pthread_get_nice_np(), pthread_set_nice_np() - get or set the nice value of a thread
SYNOPSIS
PARAMETERS
thread The thread whose nice value is to be set/retrieved.
nice_val Value of nice to be applied to the target thread is returned (get function) or it specifies the new value of nice for
thread (set function).
DESCRIPTION
These functions are used to set and retrieve the nice value of an individual thread.
returns the current nice value setting of the target thread and stores it in nice_val. adds the value of nice_val to the current nice
value of the target thread.
A thread's nice value is a non-negative number. The system imposes a minimum nice value of 0 and a maximum of 39 with lower nice values
providing more favorable scheduling. If calling results in a nice value outside the range of 0 to 39, the value will be set to the nearest
limit. A process must have appropriate privileges to lower a thread's nice value. The function allows individual threads in the process
to have different nice values.
returns the current nice value less 20 and will be in the range -20 to +19.
The nice value of only system scope threads can be changed. An attempt to change the nice value of a process-scope thread will result in a
return value of Calling on a thread that has a scheduling policy other than will have an effect only when the thread's scheduling policy
changes to If a thread calls the system call to create a new process, the new process inherits the process-level nice value. Calling to
create a new thread will result in the new thread inheriting the creating thread's nice value.
Note
If the nice value of the entire process is changed through or all the threads in the process will have their nice values reset to the new
process-level nice value. The new process's nice value setting overwrites the old thread's setting. Thus its possible that a thread whose
nice value had been set higher than the process-level nice value have its nice value lowered as a result of the process-level re-nicing.
RETURN VALUE
Upon successful completion, and return zero.
Otherwise, an error number is returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the and functions return the corresponding error:
A process-scope thread was specified.
The caller does not have permission to lower the nice
value specified in nice_val.
No thread could be found corresponding to
thread.
AUTHOR
and were developed by HP.
SEE ALSO
fork(2), nice(2), setpriority(2), pthread_attr_getschedpolicy(3T), pthread_setschedparam(3T).
Pthread Library pthread_get_nice_np(3T)