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Full Discussion: Waiting for an arbitrary background process (limiting number of jobs running)
Top Forums Shell Programming and Scripting Waiting for an arbitrary background process (limiting number of jobs running) Post 302390843 by dpc.ucore.info on Friday 29th of January 2010 07:25:48 AM
Old 01-29-2010
My basic idea for solution would be to spawn initial N workes and save their pids to some table, then sleep 1 and see which of the PIDs are still alive. For those who are not - spawn next worker and save pid in place of the old one. Repeat until job is done.

The problem with counting with pgrep is that you will take in account the processess that may not be related with the script (any other user can run their own gzip, right?).
 

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LEARN ABOUT CENTOS

spawn.h

spawn.h(3HEAD)                                                        Headers                                                       spawn.h(3HEAD)

NAME

       spawn.h, spawn - spawn

SYNOPSIS

       #include <spawn.h>

DESCRIPTION

       The <spawn.h> header defines the posix_spawnattr_t and posix_spawn_file_actions_t types used in performing spawn operations.

       The <spawn.h> header defines the flags that can be set in a posix_spawnattr_t object using the posix_spawnattr_setflags() function:

       POSIX_SPAWN_RESETIDS
       POSIX_SPAWN_SETPGROUP
       POSIX_SPAWN_SETSCHEDPARAM
       POSIX_SPAWN_SETSCHEDULER
       POSIX_SPAWN_SETSIGDEF
       POSIX_SPAWN_SETSIGMASK

       Inclusion of the <spawn.h> header can make visible symbols defined in the <sched.h>, <signal.h>, and <sys/types.h> headers.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       sched.h(3HEAD), semaphore.h(3HEAD), signal.h(3HEAD), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.10                                                          10 Sep 2004                                                     spawn.h(3HEAD)
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