Visit The New, Modern Unix Linux Community


Wait for clones


 
Thread Tools Search this Thread
Top Forums Programming Wait for clones
# 1  
Wait for clones

Hi,
I have a methode creating several clones with the following flags: CLONE_VM | CLONE_THREAD | CLONE_SIGHAND

How to tell the parent process to wait for the clones' completion?

pid = clone( ...)

waitpid(pid, NULL , 0) always returns me -1
waitpid(-1, NULL, 0) does the same.
# 2  
clone() returns a threadid, not a pid.
clone() also shares a lot common resources, if you have 2.6.34 kernel, CLONE_NEWPID
will result in a new process address space, but the return value is still thread id.

clone was invented to do threading. Use fork() if you want to create a real child process.
If you want threads use the the pthread library - pthread_create() and dozens of associated calls. Do not use clone() like that.

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #289
Difficulty: Easy
Sun Microsystems was acquired by Oracle Corporation in 2012.
True or False?

9 More Discussions You Might Find Interesting

1. Programming

Chinese Arduino UNO Clones - The Wavgat versus the generic UNO R3 Clone - The Winner Is?

Waiting for more fun Ardunio parts from AliExpress, I decided to test two cheap Chinese Arduino UNO clones. The Arduino UNO R3 (CH340G) MEGA328P The Wavgat UNO R3 (CH340G) MEGA328P Both of these Chinese Ardunio clones sell for about $3 USD, delivered to your door. The bottom line is... (0 Replies)
Discussion started by: Neo
0 Replies

2. UNIX for Dummies Questions & Answers

Updating git clones

Hi, I'm fairly new to the git command and I'm trying to figure out how to check if your local clone is up to date with the master. I know you can do the same thing on packages with apt-get by using update and then upgrade. Is there something similar with git? (0 Replies)
Discussion started by: silverdust
0 Replies

3. Shell Programming and Scripting

calling a shell script in background and wait using "wait" in while loop

Hi, I am facing a strange issue, when i call a script from my while loop in background it doesnt go in background, despite the wait i put below the whil loop it goes forward even before the process put in background is completed. cat abc.txt | while read -u4 line do #if line contains #... (2 Replies)
Discussion started by: mihirvora16
2 Replies

4. Solaris

Mount Emc Clones in VxVm

The Storage Admin presents a clone of a LUN, on the source side the device is under VxVM control, assuming that on the target side we have scanned the new cloned LUN at the OS level (solairs), from there on how do we initialize and mount the new volume. Please give some guidence on this or a... (1 Reply)
Discussion started by: Tirmazi
1 Replies

5. Red Hat

WAIT

Can someone explain what is the status says WAIT on performance monitoring command.. (2 Replies)
Discussion started by: suresh_krish
2 Replies

6. Shell Programming and Scripting

wait command - cat it wait for not-chile process?

Did not use 'wait' yet. How I understand by now the wait works only for child processes, started background. Is there any other way to watch completion of any, not related process (at least, a process, owned by the same user?) I need to start a background process, witch will be waiting... (2 Replies)
Discussion started by: alex_5161
2 Replies

7. Shell Programming and Scripting

wait ${!}

In one of the shell script (Where abinitio graph is called), the last line is wait ${!}. What does this wait ${!} mean ??? (2 Replies)
Discussion started by: risshanth
2 Replies

8. UNIX for Dummies Questions & Answers

About wait

Hi everyone I'm novice at Unix programming and I hope to post this thread in the correct place. I have the following doubts: 1 Suppose we have some processes which are B's children process and another process A which has no relation with B and its children. Can A do wait () for a... (5 Replies)
Discussion started by: Puntino
5 Replies

9. Shell Programming and Scripting

Need to execute 2 scripts, wait, execute 2 more wait, till end of file

:cool: I need to execute a shell script to do the following: cat a file run two back ground processes using the first two values from the file wait till those background processes finish run two more background processes using the next two values from the file wait till those background... (1 Reply)
Discussion started by: halo98
1 Replies

Featured Tech Videos