Otheus -
utimes is the call made by
It gives cumulative times for user and kernel, as well as cum process wall time.
Call it for a starting set of values and an ending set of values, then substract for a delta value.
Hello,
I have a Supermicro server with a P4SCI mother board running Debian Sarge 3.1. This is the "dmidecode" output related to RAM info:
RAM speed information is incomplete.. "Current Speed: Unknown", is there anyway/soft to get the speed of installed RAM modules? thanks!!
Regards :)... (0 Replies)
Hi,
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?
I am a beginner so the simpler the better :)
Thanks
-Jaken (2 Replies)
I analysed disk performance with blktrace and get some data:
read:
8,3 4 2141 2.882115217 3342 Q R 195732187 + 32
8,3 4 2142 2.882116411 3342 G R 195732187 + 32
8,3 4 2144 2.882117647 3342 I R 195732187 + 32
8,3 4 2145 ... (1 Reply)
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.
Can any one help me with the... (0 Replies)
If I create a semaphore and then I fork a number of child processes then all the child process use that same semaphore.
Since the process address spaces are different rfom each other then how all the child process are able to access the same semaphore?
I understand that semaphore/mutex is at os... (0 Replies)
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
1 Replies
LEARN ABOUT PHP
sem_get
SEM_GET(3) 1 SEM_GET(3)sem_get - Get a semaphore idSYNOPSIS
resource sem_get (int $key, [int $max_acquire = 1], [int $perm = 0666], [int $auto_release = 1])
DESCRIPTION sem_get(3) returns an id that can be used to access the System V semaphore with the given $key.
A second call to sem_get(3) for the same key will return a different semaphore identifier, but both identifiers access the same underlying
semaphore.
PARAMETERS
o $key
-
o $max_acquire
- The number of processes that can acquire the semaphore simultaneously is set to $max_acquire.
o $perm
- The semaphore permissions. Actually this value is set only if the process finds it is the only process currently attached to the
semaphore.
o $auto_release
- Specifies if the semaphore should be automatically released on request shutdown.
RETURN VALUES
Returns a positive semaphore identifier on success, or FALSE on error.
CHANGELOG
+--------+-----------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+-----------------------------------------+
| 4.3.0 | |
| | |
| | The $auto_release parameter was added. |
| | |
+--------+-----------------------------------------+
NOTES
Warning
When using sem_get(3) to access a semaphore created outside PHP, note that the semaphore must have been created as a set of 3 sema-
phores (for example, by specifying 3 as the nsems parameter when calling the C semget() function), otherwise PHP will be unable to
access the semaphore.
SEE ALSO sem_acquire(3), sem_release(3), ftok(3).
PHP Documentation Group SEM_GET(3)