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revision 1.369 by cjwatson, Sat Aug 9 16:00:27 2003 UTC revision 1.370 by cjwatson, Sat Aug 9 17:28:18 2003 UTC
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1    Sat Aug  9 18:28:01 BST 2003  Colin Watson  <cjwatson@debian.org>
2    
3            Replace the old "wait() for one child at a time" approach with a
4            SIGCHLD-handling edifice that collects children's exit statuses as
5            they die.
6    
7            * lib/pipeline.c (pipeline_new): Initialize statuses.
8              (pipeline_join): Set statuses to NULL in joined pipeline.
9              (pipeline_join, pipeline_get_infile, pipeline_get_outfile,
10              pipeline_start, pipeline_wait): Assert that statuses field is NULL
11              or non-NULL as appropriate.
12              (pipeline_free): Free statuses if necessary.
13    
14              (pipeline_start): Add p to a new active_pipelines array, to be
15              used while reaping children. Initialize statuses elements to -1.
16              Block SIGCHLD while forking children.
17              (reap_children): New function. Delivers collected exit statuses
18              into statuses fields of entries in active_pipelines.
19              (pipeline_wait): Rather than wait()ing manually here, check
20              whether any statuses have been picked up by the SIGCHLD handler,
21              and if not call reap_children(). Remove now-obsolete TODO comment.
22              (pipeline_sigchld): New function, the SIGCHLD handler.
23              (pipeline_install_sigchld): New function, to be called once per
24              program.
25    
26              (pipeline_start, pipeline_wait): Add minimal debugging
27              information.
28    
29            * lib/pipeline.h: Prototype new functions.
30              (struct pipeline): New statuses member.
31    
32  Sat Aug  9 17:00:12 BST 2003  Colin Watson  <cjwatson@debian.org>  Sat Aug  9 17:00:12 BST 2003  Colin Watson  <cjwatson@debian.org>
33    
34          * lib/pipeline.c (command_dup): Copy cmd->nice.          * lib/pipeline.c (command_dup): Copy cmd->nice.

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