cvs commit: src/usr.bin/make job.c job.h main.c make.c
sobomax at portaone.com
Sun Nov 14 15:42:18 GMT 2004
Great job! However I wonder if use of pipe(2) would be better way, which
will not leave any traces behind it in the case when all makes die in a
way that prevents them from taking clean up actions (e.g. kill -9).
Poul-Henning Kamp wrote:
> phk 2004-11-12 08:58:07 UTC
> FreeBSD src repository
> Modified files:
> usr.bin/make job.c job.h main.c make.c
> Add code to enforce the paralleism count (-j N) for the entire tree
> of submakes spawned during processing.
> We create a fifo and stuff one character into it for each job we are
> allowed to run. The name of the fifo is passed to child processes
> in the MAKE_JOBS_FIFO environment variable.
> A make which finds this variable on startup will open the fifo and
> only spawn jobs when it managed to read a token from the fifo.
> When the job completes a token is writen back to the fifo.
> Slave make processes get one token for free: the one their parent
> make got in order to run them. This makes the make processes
> themselves invisible in the process counts.
> The net effect is that "make -j 12 -s buildworld" will start at
> most 12 jobs at the same time, instead of as previously up to
> 65 jobs would get started.
> Revision Changes Path
> 1.57 +114 -28 src/usr.bin/make/job.c
> 1.26 +1 -1 src/usr.bin/make/job.h
> 1.96 +2 -0 src/usr.bin/make/main.c
> 1.25 +2 -2 src/usr.bin/make/make.c
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