How to make C program wait (on Linux)?

Question

How to make C program wait (on Linux)? (I need to use wait with MPI - I need C code please)

sleep() from unistd.h? what do you mean by 'wait'? Just stop for a given amount of time or wait for another process to do something? — Federico klez Culloca, Apr 02 '10 at 10:12

score 12 · Answer 1 · answered Apr 02 '10 at 11:08

If you want to wait for a MPI request use MPI_Wait: http://www.manpagez.com/man/3/MPI_Wait/

If you want to wait a certain amount of time use sleep: http://www.manpagez.com/man/3/Sleep/

If you want to wait another process to end use waitpid: http://linux.die.net/man/2/waitpid

If you want to wait a condition variable (multi-threaded programming) use pthread_cond_wait: http://www.opengroup.org/onlinepubs/007908775/xsh/pthread_cond_wait.html

Define what you want to wait for.

And if you want MPI processes to wait on each other you might want to use mpi_barrier — High Performance Mark, Apr 02 '10 at 11:36

score 4 · Answer 2 · answered Apr 02 '10 at 10:11

4

answered Apr 02 '10 at 10:11

Andreas Bonini

3

Or `nanosleep` in case he wants to wait less than a second: http://www.manpagez.com/man/2/nanosleep/ (it was clear from the link, but people skip right past links sometimes) – T.J. Crowder Apr 02 '10 at 10:17

score 2 · Answer 3 · answered Apr 02 '10 at 10:11

2

Wait for what exactly ? If you just want a delay use sleep().

answered Apr 02 '10 at 10:11

Paul R

score 1 · Answer 4 · answered Apr 02 '10 at 10:13

1

Use MPI_Recv, and use MPI_Send to send a message to the waiting process when it should continue.

answered Apr 02 '10 at 10:13

4 Answers4