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

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    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? Commented Apr 2, 2010 at 10:12

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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.

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And if you want MPI processes to wait on each other you might want to use mpi_barrier
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You can use sleep(seconds)

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Or nanosleep in case he wants to wait less than a second: manpagez.com/man/2/nanosleep (it was clear from the link, but people skip right past links sometimes)
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Wait for what exactly ? If you just want a delay use sleep().

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

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